Gents -

Have a LS3 /L9H transplant into a 2011 Jeep JK with a 6L80e automatic transmission.

Truck idles just fine with normal MAP readings but when I drive it the MAP is over 85kpa at cruise!!!! This is sending it into enrichment mode and its just dumping fuel into it.

Again, at idle all parameters are perfect, O2's MAF freq, everything looks like a perfect LS3...


We have looked for possible causes such as a plugged exhaust and the like but we cant find any problems... There are no codes in the computer or transmission.

Anyone ever experienced this before?

Any help would be appreciated.


Thanks,

J