Jeep misfire
Asked by kellie Jun 25, 2018 at 08:30 AM about the 2002 Jeep Grand Cherokee Limited 4WD
Question type: Maintenance & Repair
So my jeep wj 4.7 has a tiny misfire at idle
only when warmed up . It doesnt do it
when cold and idle slighty flucuates also.
Sparks plugs are good, air filter tps, no
vaccum leaks iac and throttle body are
clean not sure when coils were changed
though, also i dont think the misfire is
related to idle flucuation because it
flucuates when cold but idles fine .
6 Answers
No clue. I figured it might be a coil going bad and not working right when hot
Should i try running some seafoam ? .... should i go ahead and replace all 8 coils is it possible thats the problem ?
Do u have any experience with seafoam working? .....
So i already put seafoam in my gas tank last time i got gas im almost down to half a tank now . Should i get annother can next fill up ? Do u think it would accuatly clean injectors if thats whats causing the misfire ( its very small) also no codes either
I just drove it down the road and when i parked it , it was at operating temp and idle was only flucuating a tiny bit and idle was sounding good i didnt hear the tiny misfire that sounded like a cough. so i think the seafoam is working nicely as the closer i get to empty tank ( i have bout half now )
Did that not to long ago cleaned throttle body and Iac , just changed tps . And recently checked plugs and gaps they almost look new thats why iv pretty much narrowed it down to coils and injectors
