Hello TJ Forum,
I have been trouble shooting my 01 TJ with 59k miles for the last year or so and cannot seem to find the cause of its issues.
The Jeep has an idle around 500rpm and once put into gear there is an immediate difference in the vibration at stand still; the vibration goes away once the throttle is engaged after 1mph or so. This rough idling in gear is also significantly worse in 4H at stand still. The idle issue is paired with misfire codes that have been diagnosed at multiple shops resulting in the coil pack, spark plugs, o2 sensors replaced, throttle body removed and cleaned, IAC sensor removed and cleaned, and a fuel injector cleaner. All replacement parts used were NGK/NTK/Name brand parts. I have never felt a misfire while driving the Jeep and two shops have gone as far to say there are no misfires present in the cylinders. A year ago I removed the stock suspension and replaced it with a 3.5” Metalcloak lift with a Tom Wood’s Rear Drive shaft and Teraflex Slip Yoke Eliminator; may this link to any of the Jeep’s vibration symptoms?
Do y’all have any advice on the rough idle in gear at stand still and the possibility of a “faulty” misfire code? Other than the rough idle in gear and the misfire codes coming on and off throughout the year, the Jeep drives and runs great. She’s in beautiful condition and I’d like to ensure my future children and grandkids can drive it around one day. Thanks for any help and please do not hesitate to ask for more info if needed!!
I have been trouble shooting my 01 TJ with 59k miles for the last year or so and cannot seem to find the cause of its issues.
The Jeep has an idle around 500rpm and once put into gear there is an immediate difference in the vibration at stand still; the vibration goes away once the throttle is engaged after 1mph or so. This rough idling in gear is also significantly worse in 4H at stand still. The idle issue is paired with misfire codes that have been diagnosed at multiple shops resulting in the coil pack, spark plugs, o2 sensors replaced, throttle body removed and cleaned, IAC sensor removed and cleaned, and a fuel injector cleaner. All replacement parts used were NGK/NTK/Name brand parts. I have never felt a misfire while driving the Jeep and two shops have gone as far to say there are no misfires present in the cylinders. A year ago I removed the stock suspension and replaced it with a 3.5” Metalcloak lift with a Tom Wood’s Rear Drive shaft and Teraflex Slip Yoke Eliminator; may this link to any of the Jeep’s vibration symptoms?
Do y’all have any advice on the rough idle in gear at stand still and the possibility of a “faulty” misfire code? Other than the rough idle in gear and the misfire codes coming on and off throughout the year, the Jeep drives and runs great. She’s in beautiful condition and I’d like to ensure my future children and grandkids can drive it around one day. Thanks for any help and please do not hesitate to ask for more info if needed!!