Misfire help!
#1
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Model: Cherokee
Misfire help!
Hey guys i am new to the forum and i have a 2001 XJ automatic with the 4.0L . i bought the jeep for a steal and i absolutely love it . i am having a misfire problem tho. when i drive in the highway 60-70 MPH the check engine will flash ( misfire) and the jeep will keep on driving OK until it finally goes into LIMP MODE and the jeep will run like crap so i usually have to pull over and restart it and it will go back to normal for a lil while . driving in the city i get no codes ONLY HIGHWAY????
The only code i get is Cyl 6 misfire and no other code.
i have replaced:
New NGK spark plugs
New Coil-pack
New Injector (cyl 6 only)
Sea foam
compression test came out OK
Not losing coolant at all (head gasket)
Any ideas? next thing i will do is check all the wiring that i haven't done yet but any help is appreciated!
The only code i get is Cyl 6 misfire and no other code.
i have replaced:
New NGK spark plugs
New Coil-pack
New Injector (cyl 6 only)
Sea foam
compression test came out OK
Not losing coolant at all (head gasket)
Any ideas? next thing i will do is check all the wiring that i haven't done yet but any help is appreciated!
#2
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Join Date: Jul 2012
Location: SD
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Year: 1998
Model: Cherokee
Engine: 4.0
Yes, check wiring. If you can get a noid light, check the injector pulse on #6.
BTW, a flashing CEL means to stop driving it pronto, or cat damage can occur.
BTW, a flashing CEL means to stop driving it pronto, or cat damage can occur.
#3
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Model: Cherokee
you think if i re-wired cylinder 6 injector to eliminate the possibility of bad wiring would be a good idea? i would just need to figure it out which wires are which at the ECU.
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