Green Mesa XJ
NAXJA Forum User
- Location
- Pensacola, FL
Something is off. Those 3.7 are do not like getting too hot so head gaskets can be common (like every aluminum head engine). I’ve heard about those engines dropping a valves but I’m not sure how common or what the cause is. I think it was more common 2002-2004 but don’t know for sure.
My guess is the head the put back on was not from that under 100k motor, they probably either farmed the job out locally for a rebuild and that local machine swapped it for one already the shelf or got a national rebuild company’s garbage head off a very abused motor. Other than that the damage to that head makes no sense unless the rebuild was out of spec and the damages followed.
Injectors can cause misses with no CEL, upto a outright fail the computer ignores it if it’s more mechanical and the injector is electronically responding correctly. Coil packs can cause issues I believe that design is three coil packs with a spark plug wire going to the other sides cylinder. Anything but mopar coil packs are prone to early failure.
I’d pull compression on that motor just to see what the hells going on. BTW that motor likes to be high compression.
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My guess is the head the put back on was not from that under 100k motor, they probably either farmed the job out locally for a rebuild and that local machine swapped it for one already the shelf or got a national rebuild company’s garbage head off a very abused motor. Other than that the damage to that head makes no sense unless the rebuild was out of spec and the damages followed.
Injectors can cause misses with no CEL, upto a outright fail the computer ignores it if it’s more mechanical and the injector is electronically responding correctly. Coil packs can cause issues I believe that design is three coil packs with a spark plug wire going to the other sides cylinder. Anything but mopar coil packs are prone to early failure.
I’d pull compression on that motor just to see what the hells going on. BTW that motor likes to be high compression.
Sent from my iPhone using Tapatalk