rehab
NAXJA Forum User
- Location
- The Citadel, SC
i have a used 4.2L with a 4.0 head i bought off a guy who rolled his jeep, with stock everything in my 88 cherokee. after replacing the old motor i found that around 1100-1900 rpm the engine sputters and spits, with the occasional backfire. its not trowing a code and i checked the new plugs and they were really white, i replaced the fuel pump and filter. now it is still doing the same thing. some how i am still getting a lean condition. i replaced the intake gasket b/c it had a wicked exhaust leak and that turned up no resolution to the problem. i am getting the proper fuel pressure and the regulator is fine. there is no cat. on the exhaust and it idles fine. I am clueless now, i have been told there is a vacuume leak, but i cant seem to find one. i have also been told that the timing is off, but i dont understand how that could happen if the timing is fixed? and it seems to run fine once im at normal driving speed. this problem has been a pain in the butt, and my jeep has some new dents in the fender because of it. any comments are welcome.
my specs are
4.2 block, stock 88, 4.0 head
stock injectors
stock distributer
no cat.
dynamax exhaust
stock manifold
stock TB
my specs are
4.2 block, stock 88, 4.0 head
stock injectors
stock distributer
no cat.
dynamax exhaust
stock manifold
stock TB