Question about 2002 Ford Mustang

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Cylinder 3 misfires

Car runs rough on ildle and aceleration cylider 3 misfires i changed plug wires and spark plugs filled with gas and gas treatment

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Install a new coil pack-Denny

Posted on Dec 29, 2013

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  • Ford Master
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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 .

Posted on Dec 29, 2013

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Posted on Jan 02, 2017

StormStrikes
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SOURCE: engine misfires

You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

Posted on Dec 31, 2008

warlock61
  • 659 Answers

SOURCE: Car is running rough, afetr spark plug change

make sure no fuel is down in the spark plug ports it will short out the spark

Posted on Apr 15, 2009

  • 2002 Answers

SOURCE: 1998 ford ranger, number 3 cylinder mis fires.

When you change the plug what color is the tip of the old one? This could be the answer to your problems. It should be a light beige or tan if everything is working properly.Just take one of the old plugs down to your local garage and get the mechanic to have a look at it. He'll be able to tell you why it keeps misfiring. Hope this helps.

Posted on Nov 29, 2009

  • 29 Answers

SOURCE: Idles rough in drive. Codes were checked and it

check the coil pack for that cylinder

Posted on Feb 05, 2010

toneman2121
  • 775 Answers

SOURCE: I have a 2001 Focus that is showing a #3 misfire,

had the same thing with my crown vic on the #8 cylinder. changed plugs and wires. still missing. wound up replacing the coil pack. you can check resistence of the coil between companion spark plug towers. ford marks each tower with 2 cylinder #'s. resisistence should be around 10-12 ohms

Posted on Mar 15, 2010

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My 1999 kia sportage glx se is misfiring but still drives,there is no warning lights on dash no engine managment light on either, would this just be the spark plugs ot the spark plug leads that is causing...


Check your fuses the one for check engine light might be bad. Every time I had a misfire with my Kia the check engine like came on. You may also take it to an Auto Zone or a store that checks the computer of your vehicle for free. If it is a misfire there are a few remedies I know of

First if you haven't changed your spark plugs in the past few years you should look at replacing them.

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I have a 2003 Expedition 5.4L Triton. Two days ago, with low gas (38 miles to empty), engine started running rough. Code read P0302, misfire cyl. 2. Since it had 113K miles, I figured its time to change...


Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
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1992 oldsmobile 88, idles rough and when starting from a dead stop it misfires pretty bad but once the revs get up its goes away for the most part. what can cause this?


The first step would be tuning the car up, new spark plugs new spark plug wires, replace the PCV valve and fuel filter as well the air filter.

If you did this and or know that the engine has new-ish parts above then invest in a few tanks of BP or Shell or leading name brands of gas to make sure your not getting a "bad batch".

Also note, fuel injected cars need cleaners to keep injectors from clogging, if you get gas with no "cleaners" in it will develop deposits in the injectors that squirt gas into each cylinder, run a leading brand fuel system cleaner, the higher the price the better it seems to be.

As well go to a Walmart and buy the TEC brand gas treatment and or cleaner and add to your tank every 4th fill up or sooner.
Best of luck I hope this helps if not ask again with new info!

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Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

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Sounds like it needs spark plugs and wires, and a fuel system treatment.

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