CattyXJ

I repaired my AC with a new AC clutch relay, and the next day the idle was awful. I took it to autozone and it had a cylinder 1 and 4 misfire, which I traced to loose wires on the distributor...didn't fix it. It also has a bad coolant temp sensor code. It's not overheating and there's no CEL. Could that be the source of the rough idle? Also, it's running rich and my gas mileage sucks, which makes me think O2 sensor? It's a 96 XJ 4.0. Thanks in advance for the help!

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Turbo X_J

Check the resistance of the CTS against the specs in the FSM. If it's out of spec, replace it.

CattyXJ

Yeah that was the plan for when it stops dumping rain out here, but can that be the cause of the rough idle? I want to know that I shouldn't be looking for an additional issue.

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Turbo X_J

CTS for the PCM, not the dash gauge.

CattyXJ

Obviously, let me cut the fat out of my question. Can a bad coolant temp sensor cause a rough idle?

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