Missfire

[Enzo354]

I did a top swap on my monte carlo and no matter what I do I cant get my missfire to go away. I replaced all of the wires/plugs and it stays. Tried a new coil on the missing cylinders and it still misses.

Heres the awesome part, it doesnt happen all of the time. It seems like humid weather really messes with it but other times it doesnt. I was doing hot laps at a local track, parked it for a week, drove it a while and the miss came back.

Should I try replacing the icm or the whole harness?

 

[Scottydoggs]

what are you plugs gaped at? maybe you could try going with a smaller gap?

 

[BOOST]

My GTP did this same thing and i did what you did.. All plugs, wires, supercharger belt, coils, everything i could think of.. But then i did a little more research.. try replacing your ignition module.. its what the 3 coil packs sit on top of.. very simple to replace but pricy.. or clean up your one on there and use some dialectric grease to make a better connection.. my car hasnt missed since i did that

 

[Enzo354]

I'm gaping them at .55 . I guess Ill have to try to clean up the ICM better or get another if it helped you.
Any other suggestions?

 

[BillBoost37]

I've see it be the icm as well....it's less common but happens.

 

[Enzo354]

I tried another ICM, the stock one that I never had issue with before the swap. Still misses. What do I move to now? Injectors? Wiring harness?

 

[Enzo354]

Alright it is still missing. I looked over everything and so far have put in

All new coils
3 NEW sets of plugs/ wires
Tried 2 ICMs
Gapped at .055

I got some actual videos of what is happening.

 

[Explicit_Spade]

Noone on MCF could help you? Not even MrCheyes?

Brock, check your injectors. Make sure they're all seated right. Do you have any KR?

 

[Enzo354]

No knock, if maybe 1*. The injectors have all new o rings, and they dont leak at all, but I guess it wouldn't be a bad idea to see if they are clean.