misfiring problem

[30thblackcam]

about 4 months ago my car was misfiring bad and the ses light came on. i took it to advanced auto and got it scanned and it said misfire on cylinder 4 and something about an O2 sensor. i bought new plugs and wires for it and put those on. after that the car ran really good with no problems whatsoever. then i hopped in it the other day and here it went again misfiring. so it ran good for 4 months then just all of a sudden decides to start misfiring again. it seems like it may be even worse now and the engine light doesnt come on unless i stay on it and it misfires like crazy then it starts blinking. the misfiring problem is getting really annoying. what can i do bout this? i would appreciate any help.

[Jhonathan_W]

Re: misfiring problem

I had the same problem. I had two cylinders out though. About 4 months later just like yours it started doing it again. It was some coils. I can't remember specifics on which ones or whatever, but I know that's what it was. I think I replaced two.

[lookout4theyeti]

Re: misfiring problem

i just posted about my misfire problem.. see the thread in this section titled "misfire p0305"

Replaced plugs and wires (which i needed to do anyways, previous owner had platinum 4's in it...)

Checked the coils, turned out the 2/5 cylinder coil was shot. Replaced it and havent had any problems yet. Easy fix, its worth checking out.

[vintageagain]

Re: misfiring problem

Same here, Miss fire on coil 2/5. I also had the Ignition Control Module [what the coils sit on] replaced too. I'm not sure if it was really bad so when i was told the coil and ICM went i asked for the old parts from the shop. Anyone know how to diagnose the ICM?

[lookout4theyeti]

Re: misfiring problem

Same here, Miss fire on coil 2/5. I also had the Ignition Control Module [what the coils sit on] replaced too. I'm not sure if it was really bad so when i was told the coil and ICM went i asked for the old parts from the shop. Anyone know how to diagnose the ICM?

i pulled mine out and took it up to autozone. They were able to hook it up to some test machine to see if everything checked out on it. I forgot to mention that I did that before replacing the coil to make sure that it was in fact the coil and not the ignition module.

[30thblackcam]

Re: misfiring problem

i guess i will look into the coil packs and icm. i appreciate the help.

[lookout4theyeti]

Re: misfiring problem

i guess i will look into the coil packs and icm. i appreciate the help.

No problem.. Good luck, let us know how it goes

[30thblackcam]

Re: misfiring problem

well today just right in the middle of driving, my car decided to start misfiring really bad, like i cant hardly accelerate. so i got coil packs and replaced the coil packs. this didnt help things at all. so maybe its the icm. i just got desperate today and tried to see if i could fix it real quick cause im tired of all the crap its been doing.

[lookout4theyeti]

Re: misfiring problem

well today just right in the middle of driving, my car decided to start misfiring really bad, like i cant hardly accelerate. so i got coil packs and replaced the coil packs. this didnt help things at all. so maybe its the icm. i just got desperate today and tried to see if i could fix it real quick cause im tired of all the crap its been doing.

take the coils off, take off the 3 bolts on the icm, pull the icm so you can turn it around and unscrew the bolt on the wiring harness. Then you can pull it out completely, take it up to autozone and they can test it for you.

[Jhonathan_W]

Re: misfiring problem

The weird thing is that I got mine scanned at an auto parts store too and they told me an o2 sensor. Well I went to the dealership and they replaced my coil or some coils. I still haven't replaced the o2 sensor they said needed replaced and it ran fine before I left. No codes or anything.

[Jhonathan_W]

Re: misfiring problem

Any luck yet? I'm curious about this issue myself.

[lookout4theyeti]

Re: misfiring problem

The weird thing is that I got mine scanned at an auto parts store too and they told me an o2 sensor. Well I went to the dealership and they replaced my coil or some coils. I still haven't replaced the o2 sensor they said needed replaced and it ran fine before I left. No codes or anything.

Same thing happened to my dads van.

Im pretty sure that misfires can cause a code for an o2 sensor. My dads threw a p0305 for the misfire and a p0133 for the o2 sensor. Replaced the coil on the 5th cylinder (he has coil-over-plug ignition) and everythings been fine since.