Hello all,

I recently built up a 5.9 gasser in a 96 Ram 1/2 ton 4x4 automatic for a friend of mine. He is having issues with a check engine light and noticable lack of power. The codes were pulled and showed a faulty CPS (crank position sensor). He threw in a new one and said, "It had tons of power for about 5 minutes, now it's back to gutless." The check engine light is on again and I have a lurking suspicion that the CPS is not the main problem. The truck should dyno around 400hp at the crank, and it feels like an old 2.8l chevy.[:'(] Any suggestions?

Thanks Much
Sean

 

You may need to shim the CPS. Take it off and look through the hole. See if there is paint missing from or a streak on the flexplate.

 

Also, I read elsewhere about a guy who was getting a cps code. After several new sensors, he discovered that he had a bad coil.

 

Mopower,

By bad coil, I assume you mean ignition coil. The CPS works off induction, and therefore has its own coil. Any ideas as to why the coil would throw a CPS fault? I will look into the coil tomorrow.

Thanks,
Sean

 

Yes, I meant ignition coil. It never really came clear why the bad coil was causing the code, but it gave the guy fits. He was running the infamous Accel stock type replacement coil. He replaced lots of stuff before he figured it out.