ReMan ZJ 4.0 Runs Great....with a glitch
98 Grand Cherokee with 180+K miles lost a cylinder...frankly ran pretty good on five, but being perfectionist who likes compression on all six, decided to try guaranteed reman 4.0, because it made the most $ sense if I wanted to keep the car. The Jeep was in all ways a Keeper. Along with the rebuilt motor, replaced EVERY accessory and anything else I normally put in new for my other (non-Jeep) rebuilds.
New motor didn't want to run nice, until a Carquest rebuilt PCM was installed. Previously it ran wonderfully on 5-of-6 with never a light or code on the original computer. I was not present when the decision to toss the old PCM went down, sadly. Went through THREE PCMs from Carquest, until we got one that worked reasonably well...which also ended up costing a pricy factory reflash by local Jeep dealer's service department. Motor's broken in, runs swell, but keeps spitting up engine lite and P1901 Cam or Cranksensor Lost code. Every sensor was new. Every sensor was replaced. Car continues to run swell, but lite continues to reappear. Finally (shudder) consulted dealer. They insisted aftermarket sensors were the problem and hi-dollar Chrysler beauties would fix this little irritant. Several hundred dollars later, with both cam and crank sensors replaced yet again, car continued to run wonderfully....with recurring engine lite/P1901 code, of course. Over 600 miles on the motor, first oil change and other inspections reveal all is well. I'm sure the dealer will next happily tell me the $1000 factory computer is needed.
But I'm the skeptical sort. I see many "guranteed or money back" flashed/rebuilt PCMs for this 4.0 on ebay, etc, for cheap bucks. But I like to tinker, and hate wasting money on things that work well (like straight six engines) for stupid things that don't (like engine warn lites/nuisance code puking pcms)
Apologize for the long intro, but I'm just naturally blabby and like to hear the tapping of keyboards. If I've violated some village code of conduct, well, it will be the first and last time, I'm sure. I honestly couldn't find a thread like this, but I'm no expert on the forums...
Any thoughts, been-there-done-that's out there, useful insights?
Last edited by soslame; 04-25-2014 at 12:26 PM.