PeterN
NAXJA Forum User
- Location
- Westminster,ca
1996 XJ 4.0
My exhaust manifold cracked a while back and I procrastinated on replacing it until recently. A few days before I put the new manifold in my jeep started running real rough and the check engine light came on. I thought it was just from an O2 censor because of the exhaust leak. Once I had replaced the old with the new I noticed the rough idle was still present, only now I could hear a very distinct clicking. I ran some throttle body cleaner through it and put in some injector cleaner and nothing changed. Scanned the computer and the only thing it was saying was too much voltage from engine temp censor, I got the new one about to be installed but I have to remove the valve cover because of the location of the bolt. I don’t even see how this could cause rough idle, when I did my transmission I accidentally unplugged this censor and drove it to get it scanned to see why the check engine light was on and it ran just fine.
As for troubleshooting the rough idle and clicking noise from my motor (injectors?) I thought it was just because of the cracked exhaust manifold, but im not too sure of that. I tried unplugging the fuel injectors while the motor was running and the only one that made a noticeable difference was from cylinder #3.
Does this sound like a bad injector? The spark plugs seemed a little lean but nothing to obvious.
I would really appreciate any info thanks in advance.
My exhaust manifold cracked a while back and I procrastinated on replacing it until recently. A few days before I put the new manifold in my jeep started running real rough and the check engine light came on. I thought it was just from an O2 censor because of the exhaust leak. Once I had replaced the old with the new I noticed the rough idle was still present, only now I could hear a very distinct clicking. I ran some throttle body cleaner through it and put in some injector cleaner and nothing changed. Scanned the computer and the only thing it was saying was too much voltage from engine temp censor, I got the new one about to be installed but I have to remove the valve cover because of the location of the bolt. I don’t even see how this could cause rough idle, when I did my transmission I accidentally unplugged this censor and drove it to get it scanned to see why the check engine light was on and it ran just fine.
As for troubleshooting the rough idle and clicking noise from my motor (injectors?) I thought it was just because of the cracked exhaust manifold, but im not too sure of that. I tried unplugging the fuel injectors while the motor was running and the only one that made a noticeable difference was from cylinder #3.
Does this sound like a bad injector? The spark plugs seemed a little lean but nothing to obvious.
I would really appreciate any info thanks in advance.