Sparkinak

I have a problem with my TPS. If I plug it in it will not rev up. If I unplug it, it will stumble a little bit but it will rev up. I have checked my wireing as it is a custom harness and they all go back to the correct pins on the pcm. The TPS is off of a 72mm truck throttle body, and it was put onto a l92 intake with the 90mm Holley Throttle body. The tune was for a stock 6.0 truck intake. Don't know if any of that info helps but I can't figure out why it won't rev while its plugged in.

fuseone

did it rev fine before with it on and the just occour now?

Sparkinak

This was all first time shot. Never ran before the motor swap... So I don't have a baseline.

69LT1Bird

iTrader: (1)

Connect a meter to the TPS to see of it is reading correctly. It is a basic pontentiometer. With it plugged in and key on, you should have about 0 volts going back to the PCM and 5 volts at WOT.

Sparkinak

I checked operation, I got 5 volt reference, I have .4 volts at idle, and I got 4.65 at WOT.

Does this mean I have a bad PCM?

Sparkinak

Come on some one has to know how to fix this!!!!

If I unplug the sensor it will rev up kinda sluggish but it will, If I plug it in and try to rev it, it will climb 2-300 RPM and then shut down like it hit a rev limiter. Then it will start to surge for 5-6 times and then level out. Is it something easy dumb ground, PCM

Richard@WCCH

iTrader: (3)

Look up DrX on this site. He has vast knowledge of the DWB ttbs on truck applications

Good luck,

Richard