So I have been having a big issue with my truck. Im driving down the road and all of a sudden the CPU shuts off the truck . I have done all the wire splice fixes and changed out some sensors, I have found the issue i think. when the CPU feels any bumps on the road or shaking it turns off. Here are some videos showing the issue. Please keep in mind that the CPU is about 3 months old from JEGS. I think I will have to return it and get a new one. Please chime in on what you think.


so heres the video of the truck with the computer mounted properley and when tapped on the side the truck starts to turn off.

http://img510.imageshack.us/img510/3782/myh.mp4

Heres the video of the CPU side away from the fender on its side no problems here.

http://img37.imageshack.us/img37/1631/87h.mp4

 

There is a ground connection in between the PCM and the firewall on the same fender, thats one possibility.

That may be loose or corroded. Maybe a bad wire terminal to the PCM, I had one on an injector causing a miss. Have you tried shaking the wiring harness and see if it dies?

 

Yea I tried shaking it like crazy when away from the fender, and it did not die at all. It didnt make sense. Im going crazy over this. I will try the ground wire to the fender from CPU tomorrow. Any other ideas?

 

I had that issue on a couple of my previous cars. One Jada bad ignition wire where sometimes it wouldn't start and sometimes would shut off. It took me a long @$$ time to figure it out(I ripped the entire car apart searching for it). another was the connector on the PCM had contracted from the cold air in winter and would slip loose while driving. The third car was the CPU in the PCM was loose so I replaced since it was under warranty.

 

So I got a new CPU ( but looks used) from Jegs, Installed it and bang the heck out of the fender and the CPU did not die at all the truck kept running right, hopefully this was the issue, I will drive around tomorrow and see if all is good,