Misfire #6, #2, #5, #1

[Xcellr8]

Question, so I have an 03S that runs like crap. Barely drive able because of P0306, P0302, P0305, and P0301, all misfires in the cylinders represented by the last digit of the codes. IF an IMS bearing were in the process of failing, and the chain(s) jumped a tooth, could that cause these codes?

I've changed spark plugs and coils. No difference. Definitely a timing issue don't you think? Appreciate your comments.

Thanks,
Joe

[Smallblock454]

Hello Joe,

phew, why is everything in this forum related to a failing IMS? Maybe i should move to the US and open a workshop or dealership. Would buy this trashy cars cheap, repair cheap and sell with big margin.

Cylinder 6, 2, 5, 1 are on different banks. So if there would be a timing issue, than all cylinders should do have misfire. Why only 4 of 6?

Some questions:
The engine didn't run well before you've changed coil packs and sparks?
Did the problem occur after you've changed sparks and coil packs?
What diagnose tool did you use to get the codes?
Did the car sit for a longer time before this problem happens?
Did the problem happen immediately when the car did run?
How do the spark s look?
Did you check oil and oil filter for debree?
Is it possible to check camshaft deviation or is the engine running so bad that you can't do it.
Does it only run bad at idle or higher revs?
Did you check if the camshaft adjustment works proper?

Could you provide us a video with the engine running?

Thanks and regards, Markus

[Xcellr8]

True, true, always jumping to the IMSB. For an 03, I suppose we should suspect the lifters. Does the 3.2 have the lifter problems the 2.7 has in the 03-04? Thanks for the clarifying questions.

The codes came from PIWIS.
The engine was running bad when I acquired the car.
Unknown how long the car had been sitting, but car was sold because of this problem.
I changed all spark plugs with new. Changed all coils with known good coils.
Car ran the same.
Codes were the same.
Old spark plugs had more oil than I'd like to see. However, no smoke out exhaust.
Runs bad at all RPM. Maybe less noticeable at higher RPM, but clearly not right.

How would I check if the camshaft adjustment is working properly? Have not checked cam deviation.

I suppose I could get a video of the engine running.

Thanks, Joe

[itsnotanova]

Maybe not the same problem, but I was getting misfire codes because the injector electrical connection wasn't completely connected on two of my cylinders.

[Need_for_speed]

Misfires are always such a pain in the a** due to the detective work required to troubleshoot. Seems like a million things could be the issue, and the codes you get either tell you too little or send you in the wrong direction.

In addition to the issues above, other forum members with misfires have reported the following:

Bad or dirty MAF
Melted CATs
Bad exhaust gaskets (usually header)
Hole in intake plenum
Failing O2 sensors
Failing Crankshaft Position Sensor
Failing Camshaft Position Sensor
Failing fuel pump
Dirty fuel filter

Good luck! Keep us posted.

[Dubaday]

I'd check the connection points of all coilpacks and the 02 sensor connections as well. It could be as silly and little of a problem as that. Crossing my fingers for you.

[Jamesp]

Check the electrical connection on the variocam solenoids.