Jeep coolant temperature help

[spareparts]

MAP sensor? Was it running rich or lean? it doesn't make sense to me, but whatever works

[THEFERMANATOR]

Jeeps run lean to begin with for emissions reasons. If the MAP was far enough off it can push stoic up to around 15.5-16:1 which would lean it out big time. Never heard of one doing it at idle unless for some reason it wasn't going into closed loop.

[tsubaki]

I actually argued with my father that it was not possible to be the problem. His response was "you done replaced everything else, it's going to be a lot easier changing it instead of replacing the head gasket or timing chain".
The live data stream from the code reader showed the timing jumping all over the place after it got warmed up, I was convinced the timing chain was stretched slightly.
Glad I was wrong and did like Daddy said.

[THEFERMANATOR]

Originally Posted by tsubaki

I actually argued with my father that it was not possible to be the problem. His response was "you done replaced everything else, it's going to be a lot easier changing it instead of replacing the head gasket or timing chain".
The live data stream from the code reader showed the timing jumping all over the place after it got warmed up, I was convinced the timing chain was stretched slightly.
Glad I was wrong and did like Daddy said.

The timing chain would have no effect on the timing. The timing is based off of the crank sensor, and only uses the sensor in the distributor as a sync signal to tell it when it is at TDC on #1 for fuel injection.

[bradford]

Slightly off topic, but Tsubaki I have a 1997 Grand Cherokee my brother in law and I are gonna be parting out if you need any parts. 4.0 engine, 4x4, automatic, black exterior.

[tsubaki]

Thanks bradford, those parts are getting scarce and should command a premium.

[THEFERMANATOR]

I've got a 97 4.0L out of a CHEROKEE that has about 70K miles on it, and I can't give the dam thing away. Tried with a few people and everybody laughed at me. Things hardly ever blow an engine unless you run one hot.