Ok so today i put a new muffler on and as i was leaving work i notice my rpms jump and the trans wasn't shifting right and the cel came on so i went to autozone and had them pull the code and p0118 was the only one that popped up witch is ect sensor so i changed it and its still doing the same symptoms so now the cel came back on and it wants to stall on top of the trans not shifting right any help would be appreciated .. and its a 01 xj

 

Well, I'd be curious about the TPS as that will cause bad shifting, bad idle, stalling, might be coincidental to the muffler work. Curious what code it has now.

 

I got a code scanner at work so I'm going to check it when I get there this morning And I do believe it's a TPS sensor It was just raining pretty hard last night so I couldn't check it But I'll get back on results

 

Radi may be correct in his assumption; the TPS, ECT, IAT, TCM, and PCM are all tied together. There may be mode codes stored as "pending codes".

P0118 - ECT, P0113 - IAT, and P0123 - TPS, are all Sensor Input Above Maximum Acceptable Voltage problems.

I know if I pull the connector off the ECT while the ignition key is in the ON (RUN) postion, it will trip a P0118 code.

Here's a diagram of the circuit that includes all the prime suspects. You might want to check the connectors to the TPS, ECT, and IAT to make sure they're secure and examine all the associated wiring for chafing, breaks, etc. If everything looks secure you may need to take some voltage readings at the sensor connectors.

 

Thanks for the great info I will look into it when is soon as I get off work. I am suspecting the TPS sensor to be bad maybe some moisture got into it from all the rain we've been getting out here. I've already changed the Ect sensor when the frist code popped up so when I get back to work I'm going to put the code scanner back on it and see what it says and I'm glad both sensors have a lifetime warranty from crapyzone

 

Check over all wiring and connectors. The sensors can be new but not functioning because of open or shorted wiring or connectors. Check for "Pending" codes when you scan again.

 

I will and thanks again.

 

Problem solved gentleman it was a bad TPS sensor she runs like a dream water worked itself into the plug and shorted out the TPS

 

Thank you jtm01xj for posting the resolution. It really helps those of us new to Jeeps to see the problem, symptoms and resolution. Glad you're on the road again.