6.5L Diesel Chaos after Engine Computer was Replaced

Volume 2 Issue 2 - 6.2/6.5 Issues and Answers

I hope you can help me out. I have a big mess on my hands. Recently my ‘98 Chevrolet dually had a transmission shifting problem. I had a reputable shop rebuild the transmission. They also replaced the engine computer, saying it had gone bad at the same time. The transmission seems to be OK but now our truck runs terrible. It starts fine when it has been sitting overnight and it runs OK until it starts warming up. Then, suddenly, it will begin to run lousy and smoke like heck. It is now useless. I can’t drive it because, about the time I get a little ways down the road, it goes bad on me! If I let it sit long enough to cool off completely, it runs fine again for a short time. That shop has spent untold hours trying to fix this problem. Now, after I have spent a truck load of money, the manager of this place has given up and tells me it must be a problem with the wiring and that he does not want it in their shop again. Any help you can offer is greatly appreciated! Desperate in D.C.

Hello Desperate. Have someone check for...