Question about 2003 Ford Expedition

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Random cylinder miss firing. i changed coil packs

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Have you changed the spark plugs. I recently changed mine in an expedition and tried using the E3 plugs which were about $56. I don't see any mpg difference but I can tell a difference in take off or during acceleration. My opinion is go back with a basic OEM or Bosch platinum. Also make sure that the COP is seated good on the plug. I would also recommend using an Di-electric grease to coat the inside of the COP. Hope this helps.

Posted on Aug 27, 2010

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Posted on Jan 02, 2017

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Selvol
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SOURCE: 1996 VW Passat - Random cylinder miss fire, worse

Pop the heed, see the air box on the very left? On top of that box is the Ignition Control Unit. Little black square w/ winds about 1/2"
thick....

That is the problem. Or Your MAF sensor...
I don't know how to chech the Ignition Control Unit with out the proper tester.

But the MAF is located directly below in side the box.
If you POP off the large hose that comes out of the front of the air box. You can see the MAF, spreay it some contact cleaner for electronics not BREAK CLEANER>>>>>>.

Regards

Posted on Jun 18, 2009

  • 2 Answers

SOURCE: po 300 code pops up random cylinder misfire and

get a new car

Posted on Aug 13, 2009

  • 7353 Answers

SOURCE: miss fire cyc 8 changed plug and coil pack scan

check compression, then fuel injector. or vac leak. what kind of scan tool. very few will give live misfire data. you are sure you replaced number 8, drivers side rear?

Posted on Oct 21, 2009

  • 819 Answers

SOURCE: I have a 2002 TrailBlazer with the straight

did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Posted on Feb 28, 2010

  • 1608 Answers

SOURCE: engine miss at idle. cylinder 1 and 3 has no fire

Try the ignition module.This is more than likely your problem.It is on the coil pack where the wires connect to.I have had a few of these go on me.This should take care of your problem.Hope this helps.Good luck.

Posted on Mar 24, 2010

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3 Answers

Replaced coil pack on 3800 pontiac bonneville and its still missing what now?


First you need to determine what type of miss you have. Is it random on all cylinders, or is it restricted to one or two cylinders? Random misfire can be caused by crank or cam sensors that are starting to give out. Single cylinder misfires can be due to plugs, wires, coils (you already addressed those), as well as internal issues such as burnt or broken valves.

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I have a miss fire on cylinder 2and 3 I have changed coil pack ,spark plugs and wires still have the missing in it did not make a difference what else can I do


Is the computer code coming up as a misfire or are you actually feeling the misfire when you drive? Make sure all the grounds for the coil packs and engine are solid and clean. Many times there is rust corrosion under the pack or the retaining screws etc, Low compression can feel like a misfire as well. If all items are OK do a compression check to verify its not an issue.

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A quick way to check the single coil pack if you know for sure which cylinder is miss firing and its setting a code you can swap the coil pack to another cylinder and see if the miss changes from one cylinder to another. If it travels to where you moved the coil then the coil is bad,if not you have other problems.

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#1 and #4 are not firing I changed the coil pack and still no change any ideas


You said you changed the coil pack and the wires but didn't mention the plugs. Try moving one of the plugs to a different cylinder and see if the miss follows it. It could also be the ignition module. (the thing the coil packs mount to.)

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The codes are for a random miss, and a miss on cylinders 1 and 3.
It could be ignition or the fuel injectors, or a vac leak or mechanical problem such as a cam.
The computer sees a drop in RPM on those cylinders noting a drop in horsepower.
A mechanic would verify those two cylinders are firing and getting fuel then check for mechanical problems.

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My 2004 chevy trailblazer is missing badly. Had them read the code for me at auto zone and it said I had a miss fire on the number one cylinder. I changed the plugs and it is still missing badly


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Also, I know you changed plugs already, but always use AC Delco 43-103 plugs on this vehicle.

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Car has p300 random misfire code, cylinders 2,4,8. car has 8 new spark plugs and does not skip noticably.


does your car have a cap and rotor or do you have a coil pack if it fails it can cause a random miss-fires

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I changed wires ,spark plugs, two coil packs and the two cylinders are still not firing


Do you have a simple miss on 2 cylinders? If so, you might be looking at a fuel injection problem, specificially a computer problem not firing the fuel injectors for the two cylinders in question.

I would investigate that route.

Could also be a module for the coil packs, that the coil packs sit on.

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1994 Mitsubishi Diamante. I had this problem for a while now. When the engine is hot it gets worth. The engine is miss firing, I replaced spark plugs and wires a year ago. i also replaced Air miter. The...


check or relace your coil pack due to the fact that when a coil pack is going bad it usually looses its umph. when it get hot and that would explain random miss fires

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