Installed New Pcm in 08 Ford Edge 1 Month Later Started Messing Up Again

Dan Ferrell writes about do-it-yourself car maintenance and repair. He has certifications in automation and control technology.

With and then many systems, it's hard to find the source of a misfire.

Photo courtesy of Luke Jones on Flickr

Engine misfires tin catch you lot off guard. You are driving smoothly down the highway; side by side thing you know the engine starts to buck and milkshake.

An engine cylinder misfires when it is unable to efficiently burn down the air/fuel mixture in the combustion bedchamber. This trouble leads to all kinds of engine performance issues: The engine jerks and loses power, and fuel consumption and emissions go upwards.

How Easy Is It to Diagnose a Misfire?

That depends on the root cause of the misfire. A misfire may originate in i or more systems where components have failed or aged. Sometimes misfires are difficult to diagnose even for experienced technicians, particularly intermittent misfires.

The proficient news is that nearly misfires happen because of lack of proper maintenance of mutual and accessible parts. And then yous accept a take a chance of diagnosing the problem at home, and even fixing it, if you know how to become almost information technology.

The start thing you desire to know, though, is that y'all should start diagnosing the misfire on your car as soon as possible. Not only because you are wasting fuel and contaminating the environs unnecessarily, but also because your repair costs tin can go up significantly as fourth dimension goes past without a repair. For one, your catalytic converter may neglect due to unburned fuel.

This guide volition help you find those common misfire sources. Before, though, let's have a await at the problem in a piffling more than detail then that you know what kind of information to look for during your diagnostic procedure.

Alphabetize
I. What Can Cause a Misfire?
Symptoms to Scout Out for If You lot Doubtable a Misfire
I. How to Save Diagnostic Fourth dimension with a Scan Tool
Ii. Things to Practise Earlier Starting an Engine Misfire Diagnosis
Misfire Related DTCs
3. Checking for Lack of Ignition Spark
A Trick To Diagnosing Misfires Quicker
4. Checking Fuel Supply Issues
CEL or MIL Flashing - A Warning Sign
V. Checking for Vacuum Leaks
Vi. What If My Ignition, Fuel and Vacuum Systems Turn Out OK?

I. What Can Cause a Misfire?

As mentioned to a higher place, a misfire is the failure of one or more than cylinders to burn down properly or at all. Misfiring means the combustion procedure—the igniting of the air-fuel mixture that enters the cylinder—has been upset in some style.

A misfire usually happens considering of:

• a component failure in the ignition system (including abnormal ignition timing advance),
• issues in the fuel arrangement,
• vacuum leaks,
• compression drop in one or more cylinders, or
• problems with key valves or sensors the car computer uses to summate the right air-fuel ratio.

Misfires due to the absence of spark—as opposed to the absence of fuel—are peculiarly worrisome because the unburned fuel may find its way into the frazzle system and catalytic converter.

If this happens, the raw fuel will gradually destroy the converter; hence the need to ready the problem as shortly as possible. On most modern vehicles, the Check Engine Lite (CEL) or Malfunction Indicator Lite (MIL) will begin to flash if a misfire threatens to damage your catalytic converter.

Symptoms to Watch Out for If Yous Doubtable a Misfire

When an engine misfires, you may notice one or more of these symptoms:
* Engine loses power
* Engine is hard to starting time
* Fuel consumption increases
* Emissions increase
* Engine produces popping sounds
* Intake or frazzle manifold backfires
* Engine vibrates, jerks or stumbles
* Engine stalls

Modernistic vehicles utilize highly accurate crankshaft position sensors that can notice crankshaft bending position at any speed. This greatly helps the Powertrain Control Module (PCM--machine computer) calculate crankshaft dispatch time. The PCM can detect when a cylinder decelerates (an indication of a misfire), store a Diagnostic Trouble Code (DTC) in memory, and turn on the Check Engine Low-cal. Some motorcar computers detect misfires by measuring electrical activeness [ionization] at the spark plug electrodes.

Y'all tin can think stored Diagnostic Trouble Codes with a code reader (for OBD I systems on pre-1996 vehicle models) or a generic browse tool (for OBD Ii systems-1996 or newer models; some browse tools can read both OBD I and II).

Depending on your vehicle make and model—and the sophistication of your scan tool—you lot may get this and other data from your machine reckoner when diagnosing a misfire:

• The cylinder or cylinders where the misfire or misfires were detected.
• Whether the affected cylinder has actually fired since the problem was detected.
• Number of misfires within a recent number of cycles.
• Engine RPM when the misfire was detected.
• Misfire history.

All these are important clues that machine technicians used to locate the source of misfires.

If you don't ain a scan tool, though, yous can purchase a relatively inexpensive, aftermarket scanner you tin can use for this diagnostic. A browse tool is a practiced investment considering you can utilize information technology for other small repairs and maintenance tasks in the futurity.

Alternatively, if yous don't want to buy a browse tool now, remember that some machine parts stores in your expanse may call up any stored computer codes in your vehicle without accuse.

Not all misfires are direct translated into DTCs, specially intermittent ones. Yet, it'due south a good idea to browse your computer memory because other potential stored codes may aid you in diagnosing and fixing your engine misfires (see the box below on Misfire-Related DTCs).

Whether or not you accept access to a scan tool, this guide gives you important tips you can use to troubleshoot and fix the misfire in your vehicle.

Take a flashing Check Engine Light every bit a warning sign.

Photograph courtesy of Jim Larrison on Flickr

2. Things to Exercise Before Starting an Engine Misfire Diagnosis

Earlier y'all start diagnosing the trouble, try to gather as much information about the operating conditions in which the misfire occurs. The data that you get together gives you important evidence to help you pinpoint the cause behind the misfire. Think about the conditions in which the engine misfire occurs, for instance:

• Only when the engine is cold
• Only when the engine warms up
• But when accelerating
• It happens consistently
• Only when it rains
• Engine misfires randomly

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Perhaps the misfire began afterward you, or someone else made a repair or performed some maintenance work (changed spark plugs). Possibly you or someone else left a hose loose or electrical connector loose or unplugged.

The next three sections—Ignition, Fuel, Vacuum—nowadays the systems most probable to be backside the misfire. The section following those gives you a list and a brief explanation of other specific components that can also give you lot problem. It is meant to assistance you dig a bit deeper when necessary.

The Powertrain Control Module (PCM-auto estimator) can be a valuable source of information for your diagnostic procedure. If you find one or more of the post-obit Diagnostic Trouble Codes (DTCs), pair it with the data presented in this guide. Fifty-fifty if the lawmaking doesn't pinpoint the reason for the misfire, information technology tin can hint at the root of the problem.

Here are some common DTCs you may detect in your car computer that can assistance diagnose a misfire:

• P0100-P0104: Mass air flow sensor related codes.
• P0171 or P0172: Lean or rich fuel conditions.
• P0200 lawmaking series: Fuel injector circuit malfunctions.
• P0220-P0229: Throttle or pedal position sensor related codes.
• P0300: Multiple, random misfires.
• P0301-P0312: The last two digits point to the cylinder number where a misfire happened.
• P0335-P0339 - Crankshaft position sensor related codes
• P0400: Some codes in this series indicate an EGR system malfunction.

If you have a pre-1996 vehicle, check the manual that comes with your code reader to see the definition of the codes you lot recollect from your motorcar estimator.

Carefully bank check the condition of your spark plugs.

Photo courtesy of Jaimekop on Flickr

Three. Checking for Lack of Ignition Spark

Worn out or bad ignition system components are a common source of misfires. If yous haven't inspected or replaced ignition components during the past 3 to v years, a worn or failed component in the system may be the crusade.

If you retrieve a DTC pointing to a particular cylinder, concentrate on those components related to that cylinder. For case:

• Spark plug,
• spark plug wire,
• coil on plug (COP) component,
• fuel injector

On the other hand, if a DTC points to multiple cylinder misfires, check components that impact all cylinders:

• ignition coil
• benefactor cap
• rotor
• ignition control module

If you are not scanning the car computer but suspect a particular cylinder or multiple cylinders misfiring, you still can use the following tips.

Spark Plugs

Starting time, verify that you have a spark at the affected cylinder or cylinders. You tin can employ a inexpensive spark tester tool for this.

In addition, visually examine the spark plugs. Fifty-fifty if only 1 cylinder misfires, check each spark plug and compare its condition with the rest. Here'south what y'all can exercise:

• Apply the spark plug charts that come up with popular aftermarket vehicle repair manuals to help you diagnose common spark plug problems. For example, a fouled plug that tin can't burn appropriately may cause a misfire; merely the fouled plug may not be the root cause of the problem. Past fuel system problems may have fouled the plug, and you need to pay attention to them likewise. As well, worn out piston rings, valve seals, or guides that are causing oil to leak into the combustion chamber may be at the root of the problem.
• Besides, check that all spark plugs have the correct gap. Miles of service volition wear the electrodes and upset the spark plug gap. Consult your car owner's manual or vehicle repair manual for your detail model for the right gap. Use a wire feeler gauge to check and reset the spark plug gap.
• Check your service or repair manual for the spark plugs' service interval and replace them, if necessary.
• Cheque that you are using the correct spark plugs for your vehicle. Engines are designed to work with specific types of spark plugs and heat range, depending on the item application.
• Nowadays, yous tin can observe iridium, copper, and platinum spark plugs. Some of these plugs may work fine for your vehicle; others may not. If yous are not careful, using a type of spark plug unlike from the one recommended past your car manufacturer (or using one with a different heat range or electrode blueprint) can introduce engine operation issues, including misfires. Bank check your vehicle repair transmission for more information about the recommended spark plug for your engine.
• When installing new spark plugs tighten them to the torque listed in your repair or service manual. Leaving a spark plug loose (under-torquing) will atomic number 82 to overheating, pre-ignition, or misfires. In addition, when installing spark plugs, avoid using anti-seize compound on the threads, or use merely a dab on the upper half towards the wire terminate of the plug. If the compound reaches the insulator tip (effectually the center electrode), it may crusade a misfire.

Spark Plug Wires

Spark plug wires wear out after miles of service, which volition accept an adverse effect on the spark.

• Examine the wires for cracks, burns, and other harm. If your misfire simply occurs when it rains, start the engine and spray a little water on the wires and see if sparks announced. If so, you need to replace the wires.
• Spark plug wires can wear downward internally also. And so check each wire resistance. Yous tin employ a multimeter for this. Commonly, the wire should not take more than 12,000 ohms for each foot of wire. Consult your repair manual. If you oasis't replaced the spark plug wires at the recommended interval—see the repair manual—replace them even if they look proficient.

Ignition Curl

If the ignition curl wears out on engines with a single coil, it will cause multiple misfires; if information technology shorts out, it can cause an intermittent misfire. If your engine uses gyre-on-plug (COP) coils, and yous are troubleshooting a particular cylinder misfire, include the COP in your diagnostic.

A shorted ignition curlicue may be hard to diagnose. Unremarkably, the misfire will appear when the engine reaches operating temperature. The higher temperature will crusade the curlicue to expand, causing the short to reveal itself.

Ignition Control Module

A failing ignition control module can crusade symptoms like those of a bad ignition roll, specially later on the engine has warmed upwards. Information technology'll cause the engine to miss or stall.

Your vehicle repair transmission may take the procedure to check the ignition module, along with the voltage and resistance specifications for your particular module.

Distributor

Check the distributor, if your engine has i. Examine the cap and rotor for cracks, corroded terminals, and carbon traces that tin interfere with the spark. Supersede the distributor cap and rotor if they're iv years old or older.

Ignition Timing

Finally, brand sure the ignition timing is correct. Excessive ignition timing advance will cause a misfire.

On modern vehicles, ignition timing is controlled past the machine calculator; sometimes you tin yet bank check base timing, though. Older vehicle models equipped with a distributor are more prone to misfires due to bad ignition timing; in these models, you can check and adjust timing. Consult your vehicle repair transmission, if necessary.

Obstructed fuel injectors volition crusade a misfire.

Photo courtesy of Ed Januska on Flickr

Iv. Checking Fuel Supply Problems

Simply similar an insufficient spark, an air/fuel mixture that is too lean or too rich air/fuel will affect proper combustion.

• Take, for example a clogged fuel filter. As your miles driven increment, so the amount of particles and impurities trapped inside the fuel filter. Eventually, these particles begin to have an agin effect on fuel menstruation. They tin can restrict fuel period at high speeds, enough to crusade your engine to starve for fuel and misfire.
• Impurities and chemicals in the fuel are some other common source of problems. These impurities stick to valves inside fuel injectors, causing loss of ability, rough idle, hesitation, and misfires.
• A similar trouble may come from a leaking fuel injector. If after leaving your automobile sitting overnight you get a misfire at startup that goes abroad soon afterwards, this may indicate fuel dripping through a fuel injector valve.
• Fuel injectors can also suffer from internal electrical circuit problems, wiring harness or driver excursion in the PCM itself. Your repair manual will tell you how to do some of these fuel injector checks.
• A bad fuel pressure regulator tin can pass too much or also little fuel into the engine.

A ruptured intake manifold gasket can also lead to misfires.

Photograph courtesy of Nathanael Burton on Flickr

V. Checking for Vacuum Leaks

A vacuum leak tin produce a misfire as well. Usually, a leak of this kind volition cause one or more cylinders to misfire at idle or depression speeds, merely volition disappear one time yous get to the highway. Even so, you need to find the source of the trouble. And then here are some tips you can follow to find that leak.

• Make sure each vacuum hose is properly connected.
• Check hoses for cracks or tears.
• Trace your fingers along the length of each vacuum hose. If the hose feels too difficult or too soft, replace it.
• Starting time the engine and engage the parking restriction. Then, listen for hissing sounds coming from the engine compartment while the engine is idling. A hissing sound may indicate a loose hose, torn hose or leaky intake manifold gasket.

Damaged gaskets at the intake manifold, throttle body or carburetor will touch cylinder combustion every bit well. You can bank check vacuum hoses and gaskets using a length of rubber hose:

1. With the engine at idle, put one end of the hose against your ear.
2. Use the other end to follow the length of a vacuum hose or the edge of a gasket area.
3. If your hose or gasket is leaking externally, you'll hear a clearing hissing audio.

Consult your vehicle service manual to locate vacuum hoses and further diagnostic information.

NOTE: Symptoms of a manifold gasket leaking internally resemble those of a vacuum leak except that coolant may be seeping through the ruptured gasket expanse. Thus, if you observe a misfire at start upwardly that disappears at high speeds, and you detect that the coolant level goes down after a menstruation of time, you may doubtable an internally leaking head gasket.

VI. What If My Ignition, Fuel and Vacuum Systems Turn Out OK?

Besides components in the ignition, fuel, and vacuum systems, failures in other related components, and some changes in engine operating conditions, can lead to engine misfires as well. Under this category, hither'southward a list of known components and operating atmospheric condition that are bound to give you lot trouble.

PCV Valve

The Positive Crankcase Ventilation (PCV) valve is part of the maintenance schedule in many vehicles equipped with one. The main reason is the buildup of combustion byproducts that may clog the valve. You tin cheque the valve in minutes and replace information technology if necessary. A stuck opened valve volition crusade your engine to miss at idle. Consult your repair manual to cheque the valve.

MAF Sensor

A contaminated or failing Mass Air Flow (MAF) sensor may interfere with your car figurer and affect fuel supply to the engine. Bank check within the sensor housing offset for dirt and debris that may be interfering with the sensing element readings. Consult your repair transmission to troubleshoot the sensor for potential bug.

Engine Compression Issues

Mechanical problems like wornout piston rings or cylinder walls, a stuck valve or damaged piston, and worn valve seats can lead to misfires. Exercise a compression test using a pinch gauge to look for depression or uneven compression amid cylinders. Follow that with a leak-downwardly examination to locate the weak cylinder.

EGR Valve

A leaky or blocked Exhaust Gas Recirculation (EGR) valve is some other common source of misfires. The EGR system introduces controlled amounts of exhaust gases back into the combustion bedroom to lower cylinder temperature and harmful emissions. And then check for a bad EGR valve or carbon buildup under the valve.

Other Sensors

Other sensors you want to check when you tin can't find the source of a misfire:

• Oxygen (O2) sensor
• Engine Coolant Temperature (ECT) sensor
• Throttle Position Sensor (TPS)

Maintenance Tin can Prevent Misfires

Troubleshooting an engine misfire tin be difficult at times. But one of the best ways to prevent 1 from occurring in the first identify is to perform adequate car maintenance. You lot can check and supplant system components at the recommended manufacturer intervals.

The best part is that you can do many of these maintenance tasks and small repairs yourself. These components include changing the fuel filter, air filter, PCV valve, oil and oil filter, hoses, spark plugs, spark plug wires, distributor cap and rotor. Your car service manual, which you lot can buy at most local parts stores, will assist you service, check and troubleshoot many of these systems and components.

This commodity is accurate and true to the best of the author'south knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

Question: I accept a 2008 Mazda 6. Car runs great at first-up and my 30-minute commute to work. When I close the auto off and restart within nigh a 4-5 hour span, machine misfires cylinder ane every time. The misfires only occur when the engine is warm. Any clue for a fix?

Answer: I think the ignition whorl for that cylinder has a circuit mistake. Endeavour swapping coils with another cylinder and see if the misfire moves to that cylinder. If information technology does, you may need to supervene upon the cylinder. If the aforementioned cylinder misfires, bank check the electrical connector and wires for a loose or bad connector or wire.

Question: What is the cause of my spark scorching effectually the ceramic of my engine?

Answer: There could be several reasons for this, for example, abnormal combustion, spark plug tightened incorrectly, ignition timing too avant-garde, vacuum leaks, poor engine cooling, or lean fuel mixture.

Question: My auto misfires during showtime-up in the morn or when the engine is cold. What could be the cause?

Respond: There could be a leaking injector. The fuel that gathers in the cylinder vaporizes once the engine begins to warm up. The leak could be small enough to accept the cylinder misfire at startup, but the injector might still concur some pressure during operation. Make sure the misfire is not still there during operation. Sometimes y'all can tell past listening to the exhaust. This could be an ignition arrangement problem.

Question: If an engine misfire is e'er isolated to one cylinder does that rule causes such equally a vacuum leak which I'm assuming would affect all cylinders?

Answer: A vacuum leak can touch ane cylinder and normally upsets idle and fuel economy. The ECM tries to set the problem for the leaned condition to that one cylinder, only it overcompensates in all cylinders.

Question: I have a Lincoln vehicle that sat for a month. I put in a new battery, started it up and got misfires. First, it said misfire 1 and 2. I cleared the codes. Then I got misfire ii and 4; then the engine ran adept, but I didn't bulldoze it, only ran information technology for a while. The next day there was a misfire in cylinder ii, and a rotten egg odour. What could be the crusade?

Answer: If the vehicle hasn't been moved for a while, endeavour driving on the highway for a few minutes (20 or more), and see if the misfire goes abroad. This could be carbon buildup in the cylinder(s).

Likewise, It is possible the misfire is happening in one cylinder and causing a "sympathetic" misfire in next cylinders. If this is non a random misfire check the ignition system kickoff. Swap spark plugs or wires or scroll on plug (if applicable) to see if the misfire goes with the swapped component. And then cheque the injectors and fuel system, if necessary. The rotten egg smell tin be something serious. Too much raw fuel may be burning in the catalytic converter. If it hasn't yet seriously affected the car, fix the misfire equally soon equally possible.

Question: My 2008 Ford Escape keeps having a cylinder misfire. It'southward always the aforementioned cylinder. The mechanics replaced the spark plugs, the spark plug wire, and the ignition coils before they finally replaced the computer. Yet the bank check engine light is still coming on! Does this audio like my mechanic is on the right track, or am I existence ripped off?

Reply: One of the near common problems for a misfire on these models are faulty ignition coils. You need to brand certain there'due south expert spark and fuel (faulty injector?); sometimes the problem is in the excursion for the injector. Download the problem code and become an opinion from a reputable car shop.

Question: What could be causing a misfire in my vehicle?

Reply: Check that fuel is actually reaching the cylinder. You may need to examination the injector.

Question: My truck has a misfire and won't first at all. I give it full gas and it starts for a couple of seconds then cuts off. What could it be?

Answer: If the engine has only a distributor and coil, there could exist a problem with either of those, or the rotor. At that place could be other possibilities. Merely your engine seems wanting to start. And then I think there could be a clogging fuel filter, worn out fuel pump or bad fuel pressure regulator. Try spraying some starting fluid when cranking the engine. If it seems like it catches for a few seconds while spraying, this could be a fuel related issue.

Question: My 2011 Ford Escape started running rough. The mechanic changed the head gasket and suggested we modify the plugs and coils. We did that, simply the car completely stalls out after a few seconds of running now. We take replaced the fuel pump and throttle body as well. Code reader shows misfire on cylinder 1 and three. What is a reasonable next step?

Respond: Make sure yous have proficient spark and fuel pressure. And then check the fuel injectors, wiring and connectors for ane and 3. Other possibilities include the mass airflow sensor and fuel pump relay.

Question: What can cause misfires on different cylinders when the gas gets down to virtually a quarter of a tank?

Answer: It'south possible the tank is dirty and, when depression in fuel, the pump is sucking impurities that restrict the pump strainer; y'all may have a worn or damaged pump; water in the tank tin have the same effect. You may want to check fuel pressure level and compare it to specs. This other post may aid:

https://axleaddict.com/auto-repair/How-to-Test-a-F...

Question: My 2000 Range Rover misfires and I can't figure out why? When y'all get-go it up, and between xl-50 mph, it has a misfire on 1368. Information technology is getting a good spark. I have tried injector cleaner and it is however missing.

Answer: The problem seems to exist in one of the ignition ringlet circuits. It may have a short or a leak that is causing the spark to fail. I hope I could be more than specific. The problem could be in cylinder 5.

Question: I take a 1975 Ford truck. It runs fine at idle, and fine even revving it up in neutral, just get up to about 25-35 mph it misfires, backfires, sputters and the engine dies! I've inverse the benefactor cap and rotor, points, plugs and wires! I've pressure tested coolant system and there are no leaks, no water vapor in the exhaust, and no water in the oil! Tin can you delight give me your thoughts?

Reply: First, brand sure y'all have replaced all fuel filters in the line and screen filter going into the carburetor. There could be a problem with fuel arrangement pressure likewise. If your carburetor has a diverter where the fuel lines attach to, check that. If the filters or screens are clogged, you may demand to clean the fuel tank. Bank check for fuel flow also.

Question: My 99 Pontiac is misfiring even after changing the plugs and wires, what could be the problem?

Answer: Check for trouble codes. That could give you a inkling about the problem. Faulty fuel injectors, a bottleneck fuel filter or a faulty sensor can also lead to misfires.

Question: My Chrysler 300 only misfires on cylinder 1 when I start my car after I've been driving it. It'll stay misfiring until I park it and let the engine cool all the way down again. After that, I can offset it and have no problem with it. How tin can I troubleshoot my Chrysler's misfiring?

Reply: Usually, a bad ignition whorl may cause a misfire when the engine warms upward. Bank check the wiring and connector--loose wire, contamination, etc..

Question: I have a 2002 Honda CR-V. The check engine lite keeps coming on for multiple misfires. The mechanics replaced spark plugs and ignition coils. They said that the simply other thing they remember could be is a estimator issue. My vehicle typically misfires when I start my engine. It seems to happen more oft when the air is libation. What practise you lot think the problem could exist?

Respond: This is a guess, merely if the misfires are more than noticeable with a common cold engine or outside cold temperature, it'due south possible the fault is in the fuel system (lean status) or a sensor failing to send the correct data to the computer. You may want to monitor fuel pressure when the engine starts cold. Also, check the computer for troubled codes pointing to a sensor. Take a look at section VI in the mail.

Question: I have a 2009 Buick Lacross. The car misses when warm with a P0300 lawmaking. Nosotros changed one coil that seemed to accept no spark when warm, but the new whorl did non change the misfire. New plugs and wires were installed 11 months ago. Could the trouble be electrical to the coil?

Answer: Usually, faulty electric components show up when the engine warms upwards. This may be ignition coils, ignition command module and even a bad fuel pump. Spark plug wires with a carbon cord cadre tend to cause issues after operating for some miles under high temperatures. Other than that, there could be a number of bug. This other post may aid:

https://axleaddict.com/automobile-repair/P0300-Random-Mi...

Question: What could be the reason why my car doesn't start in the morning?

Answer: A common trouble is a bottleneck fuel filter, just fuel pressure may exist leaking. This could exist a bad fuel pressure regulator or a worn out fuel pump (check valve) or even a leaking injector(s) (on some models). You lot need to check the fuel organisation to locate the fault or, possibly, clean the injectors.

Question: My machine (Vitz new model) has a misfire and when I checked the water system, water was so hot and it merely erupted, I checked on the spark plugs and there was no trouble. So what problem could it be?

Answer: If you've been keeping with the service as scheduled past the manufacturer, the misfiring problem should be covered under your warranty. Overheating and misfire usually points to loose (under-torqued) spark plugs, leading to a faulty firing. Withal, information technology'due south better to bring it to your dealer and enquire them to expect into it. Hope this helps.

Question: I am getting misfire code and reading on #one and #two cylinders. Nevertheless, the engine is running very smoothly, no misfiring or knocks at all. What else could exist the problem? Nosotros take changed spark plugs, ignition coil, Pistons, fuel regulator. Could it be the Ecm?

Answer: Check the compression on each cylinder and see how they compare - also, yous can check the mechanical condition of the engine using a vacuum gauge:

https://hubpages.com/auto-repair/Utilise-a-Vacuum-Gaug...

Question: My misfire happens on cylinders 1 and 4 only when it rains, and once the engine warms up the problem goes away. Is at that place a fashion to waterproof whorl ane-four or should I supervene upon information technology?

Answer: Sometimes yous can find rubber covers for the ignition coil. Do a search online for your particular model.

Question: My V6 is missing on two of half-dozen cylinders. The spark plugs in both are completely clean (as they are brand new), while the working ones show signs of ignition. Nosotros've checked the continuity of the wires upwardly to the figurer, and they're all fine. Could it exist a computer trouble?

Respond: Endeavour changing the plug wires to different cylinders and see if there's whatever difference. As well, make sure the coils are good. If the coils are fired through an ignition module, make sure the module is commanding the coils -- or the ECM, depending on the model.

Question: I take a 2007 Toyota HiLux model. I was driving and it suddenly stalled. So went again and it is now running crude. Information technology came up with multiple cylinder misfire code, and I have institute a wire that's been chewed by rats. Would this exist the cause of the problem?

Answer: The bad wire may be affecting a sensor, or something in the ignition organization. Have it fixed and accept if from there.

Question: My car but misfires subsequently I get it up to operating temperature and turn it off and try to start information technology again. If I let it cool down, it runs smoothly again. Also continues to run smoothly so long as I don't shut downwardly and endeavour to restart. What would cause my automobile to misfire?

Reply: A faulty fuel injector can throw these symptoms. You may want to start there. Then cheque the fuel organization (fuel pressure level) and ignition system (for strong cylinder spark). If you haven't seen the check engine light come up on, browse for trouble codes, regardless. Sometimes a awaiting lawmaking can guide you in your diagnostic.

Question: My 2004 Jeep Freedom Express V6 is misfiring merely inside cylinder half-dozen. We replaced the spark plug and ignition coil connected to information technology and the mechanic said that it doesn't look to be the wires at first glance. The previous possessor (I bought it a day and a one-half ago and then information technology misfired and stalled backing out of a parking space) said that it had a vacuum hose issue somewhere. There is likewise a code for oil pressure low. What practice you suggest I do next? Pinch/pressure exam? Or check benefactor?

Answer: Usually, ignition and fuel system related problems are the source of misfires. have the fuel injector for that cylinder checked. A vacuum leak can as well lead to this problem. It's difficult to tell whether the depression oil pressure level and misfire are related. Unless the cylinder is leaking oil and fouling the spark plug, leading to the misfire. If a bad head gasket is leaking oil into the cylinder this might exist the cause. They demand to find out whether there's actually low pressure.

Question: My Golf game mk4 1.four 16v 1999model is misfiring on the first cylinder (all the style to the left cyl). Spark plugs, ignition coil, spark wires, and fuel injector connection is good on all four cylinders. I got a fault code maxim (DTC) "00282 Throttle position actuator DTC condition: open or short to plus." Is this guaranteed to be the Throttle position sensor causing just misfire on the first cylinder?

Respond: The fault may exist in the actuator itself, the circuit or a mechanical fault preventing the actuator from working properly. This page may be of some assist:

http://wiki.ross-tech.com/index.php/00282

Question: I have a misfire on three cylinders later several miles. I accept replaced the spark plugs, which were oily, cleaned the tubes, replaced tube seals (which were croaky), and accept not seen oil leaks since, but the misfires persist. The wires are fourteen months sometime. I practice not see any damage and I checked them with a multimeter. The benefactor was leaking oil and the points were corroded. I replaced them, just the misfires continue. What do I check adjacent to terminate my motorcar's cylinders from misfiring?

Respond: Closely check the distributor cap. it can also cause issues when hard to notice cracks and traces of carbon mess up with the spark. Since the problem is full-bodied on those three cylinders, you may want to bank check the valve train components for those three cylinders. Make certain the valves are operating as they should. If possible, download trouble codes, merely in case there'south a awaiting code.

Question: My 2011 Toyota Sienna is misfiring on cylinder one all the time. How can I place the problem and prepare information technology?

Reply: This could be a fuel or ignition related consequence. These are the near common problems. You tin check the injector first to make certain it's working. This post may help:

https://axleaddict.com/auto-repair/How-to-Test-Fue...

And so check that y'all got a good spark for that cylinder.

Question: Is it a misfire if I removed all the safe cap off the dorsum spark plug one by 1 to check where is the misfire, simply the engine sound did not change at all?

Respond: Yous need to unplug the spark plug wire from the plug. If you notice no change, there's where the trouble might exist. You lot might want to utilize a spark plug tester. That manner you can check for a weak spark that has no power for combustion. A fouled spark plug tin also misfire. Yous might desire to remove the spark plugs, one past i and check their condition.

Question: I have a 2008 Subaru Legacy GT that just had the engine rebuilt. It misfires randomly in all cylinders when the engine is warm and stalls at idle. Would a tight valve clearance peradventure cause random misfires?

Answer: At that place could be several reasons for this. Try downloading problem codes, fifty-fifty if the check engine low-cal is not on. These other posts may help equally well. Start with the stall-at-idle event. This may solve the random misfire problem.

https://axleaddict.com/auto-repair/Why-My-Automobile-Stal...

https://axleaddict.com/auto-repair/P0300-Random-Mi...

Question: I had an engine misfire on C5 and replaced the plug and wire. I took apart the wire and noticed that it was burned upwards close to the spark plug. What does this betoken?

Answer: It'south possible engine oestrus acquired the damaged.

© 2016 Dan Ferrell

rhodessubbeirie95.blogspot.com

Source: https://axleaddict.com/auto-repair/Engine-Misfires-Diagnosis-Tips-and-Strategies

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