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Trouble code P1391 - Loss of CMK or CKP ?? Does anybody know what this is?:tears: The truck will run fine until you rev engine up to 2000rpm the engine will drop to 200rpm and giving it throttle wont do anything.

Timing chain jumped teeth on my 99' XJ w/4.0 at 193k miles. Purchased new timing set but cant get it runnung again. Followed the CLYMER book and seems to be out 180 degrees. :huh: suggestions please thanks

I am looking to replace my ECM, I found one but the #s are a lil different..My #s are 56041493ad then one i found is 56041493af, does anyone know if this would work for my 99 cherokee. I would appriciate and info. thanks.

:repair:My 99' jeep is running very rich(black smoke and smell of fuel from exhaust). I got trouble code P0171 and P0505. I'm not sure what to do next?:passgas: i changed my TPS, MAP, new O2 before problem started w/ 2.5" exhaust and cat. H E L P

:banghead: please help, ive changed my TPS, MAP, both O2, plugs, wires, cap and rotor since i put new 2.5" cat and 2.5" exhaust to rear. slight leak at 2 joints in exhaust. the codes I am getting are # P0171(bank1 to lean) P0505(idle control system) P0122(low input from TPS) P0123 (high input...

hello, got problem w/ 99' XJ. its spitting black soot from tail pipe, smellin fuel, and stumbling when accel, rough idle, almost stalling when braking. all started after rain storm w/ lots of puddle jumpin. new plugs are black. i put on new cap & rotor, water remover in tank w/ cleaner...

hello, new 99' w/ 173k, 4.5" lift & 32" toyo. bought w/165k stock, all work done by myself. I hate the ABS offroad, the truck doesnt want to stop when ABS kicks in(sandy soil). No problems on the black crap(asphalt). Any sugestions would be appreciated. Totaly remove or switch on/off? Thanks