CusXj

Hi guys , will try my Best to be clear as im about to freak out on this. Since about 6 months m'y jeep had a little missfire at idle or when sitting in Red lights. Then 3 days ago it started missfire like hell. Plugged the scanner and missfire cylindre 6 , missfire multiple cylindre and o2 sensor code came off. I have changed the coil pack ( its a 2000 XJ ) , spark plug are all new and i changed injector #6. When idling if i unplug one injector at a time it missfire more but not on the #6 ( thats why i changed it , but no result ) .All wire look ok and cranksensor seems alright too.I really need help on this One guys i need my rokee ASAP

ss427ci

Holy crap, did you even bother to read any of the 15,000 threads covering this issue in depth? This forum is here to help, but it does get tiring when the same issue comes up over and over again.

Anyways, this is what I literally just posted a few minutes ago in 1 of the 6 currently active threads on this same problem a few minutes ago.

Clogged air filter
Dirty throttle body
Dirty IAC valve
Dirty IAT sensor
Clogged fuel injector
Corroded electrical connections
Corroded ground wire connections
Bad spark plugs
Dirty points in distributor
Cracked spark plug wires
O2 sensor/s
Vacuum leak

In your case, it sounds like your O2 sensors need to be replaced.
What is your build date on the drivers door?

CusXj

I did in fact. Did You manage to read what i wrote ?? Dont think so sir !

warthog

What other cylinders was it misfiring in besides #6

CusXj

Well it did not said anything else Thann , cylindre 6 and multiple cylinder but without any other détails. Please excuse my poor english , im from Québec , Canada and french is my first language !

warthog

I would do a compression test first to rule out the worst. Your o2 code could be a result from the misfire or vice versa. Make sure the head is good then move to the other stuff