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My 1998 mustang gt check engine is on and it says that cylinder 3 and 4 are misfiring. I changed the plug wires but not the plugs. It is still misfiring.

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Plugs and most likely wires aren't the issue.
The module could be,seeing as how any and all cylinders are fired by the Module.
I hope you started with the code you might have, when the check light came on. Won't tell you what's wrong,but a place to start your diagnostics.
Any vacuum leaks. Two plugs on same bank misfire! Use logic.

Posted on Aug 27, 2010

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2 Answers

Cylinder 3 misfires


I would move no3 injector to another cylinder and see if the fault moved . If not the problem is in the injector wires or ECM plug If it moved I would consider a new injector .

Dec 29, 2013 | 2002 Ford Mustang

1 Answer

My 2006 mustang gt misfires under load in higher rpms


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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This will help.

Thanks.

Feb 28, 2012 | 2006 Ford Mustang

1 Answer

My 2003 mustang has a misfire code P0302 and runs rough under load.


For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- OBD-II Trouble Code P0300? http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
---------- Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

-----------
Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

-----------
While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

------------
Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

--------------
Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

-----------
Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

----------

This will help.

Thanks.

Feb 13, 2012 | 2003 Ford Mustang

1 Answer

Changed plugs and wires and put on a new igntition coil and it is stillmissing on 2 cylinders


I believe the Mustang has 3 coils for a V6, and 4 for a V8, each coil controlling two cylinders. First you need to check and find which two plugs are misfiring, and if they go to the same plugs. It may be that more than one coil is defective and the coil pack needs replacing. With the vehicle running pull one spark plug wire at a time to find the missing cylinders. If the engine slows or starts running rough, that cylinder is firing, if you pull the wire and there is no change you have found your missing cylinder, from there trace the wire back to see which coil it plugs into. Also, make sure your plug wires are not touching each other and are in the spacers the factory installed. If you still can not find the problem it may be in the main computer. Most autoparts will run a diagnostic check for free.

Dec 30, 2011 | 2002 Ford Mustang

3 Answers

Hello my mustang is sputtering badly, idles at between 900 and 1000 rpm. has a bad exhaust smell and acts like it wants to stall alot. the oem codes it gave were po303 and po316. what does this mean and...


303= cylinder #3 misfire the 316 is just another code for misfire detected during start up:
I would say buy a new plugs and wires, this will correct the problem, Tim

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

Apr 25, 2011 | 2002 Ford Mustang

1 Answer

Rebuilt engine in 96 mustang,engine is stalling and sometimes dying.Put on machine and it said 2 and 3 are misfiring.Found out today someone replaced one of two oxygen censors with one that was for a...


The wrong part would be the first thing I would get rid of. If the part was not damaged by the grinding, there are operating ranges for the feedback of these O2 sensors which affect the settings of the Engine Management Systems. The wrong part would have to have an identical range as the correct part to work right.

The Misfiring probably has another cause. You have 2 misfiring cylinders. Make sure the wires on #2 and #3 are not crossed at the coil-pak. Then check your Intake Manifold for loose bolts. If no luck, take the good plugs on 1 and 4 and swap them with 2 and 3. Clear your engine Codes and see if the bad cylinders stay the same or follow the plugs. If cylinder 2 and 3 still misfire, its not the plugs. Test the Injectors. Switch Injectors as you earlier switched plugs, clear the Codes and see if the misfiring follows the Injectors.

If the misfires follow the Injectors, you have found the problem. Two bad Injectors. If cylinders 2 and 3 still misfire you need to check the wiring or coil-pak. Cylinders 2 and 3 each have working sparkplugs and working Injectors from the earlier swap and it is not helping.

Before blaming a head gasket, test the Injector wiring and follow the wiring to the connector for a corrosion check on the pins. If no success do a compression check on #2 and # 3 as they are adjacent to verify a blown headgasket.

I hope you find my solution very helpful. I have provided info letting you work with the parts you have. If you want to install new plugs or do a compression test first and have the tools go ahead. You will save testing time, then follow my swap methods for further results if you have good compression.

Jan 08, 2011 | 1996 Ford Mustang

1 Answer

I have a 1998 toyota sienna with 132,000 miles on it. Recently I noticed a "shuddering" or hesitation while driving that was intermittent at idle and driving. The check engine light came on...


my name is Jerry Tiet. Base on my experience on 1998 Toyota Sienna with the DTC P0303 show there is a misfire in cylinder #3. a possible cause is the ignition coil of the #3 cylinder. Compare the resistance value of the ignition coil of cylinder #3 with the other coil or simply switch ignition coil #3 with one of the other ignition coil and clear the DTC with the scan tool. Then run engine for couple days. If the check engine light on again. Let me know what is the DTC code.

Nov 11, 2010 | 1998 Toyota Sienna

2 Answers

P0300 code on a engine its says random multiple cylinder misfire ???? changed the plugs and plug wires


recheck the plugs and wires check for proper gap on plugs also check that wires not crossed and that wires are properly seated on cap and plug

Nov 12, 2009 | 1998 Chevrolet Camaro

1 Answer

1998 Cavalier No Spark in cylinders 1 & 4


ignition mod. grounds,pcm or timing belt could all be it but, I would have to look at timing first.

Jan 13, 2009 | 1998 Chevrolet Cavalier

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