PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Tps?

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Old Jul 8, 2008 | 12:01 AM
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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.
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Old Jul 8, 2008 | 12:39 AM
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did it rev fine before with it on and the just occour now?
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Old Jul 8, 2008 | 12:50 AM
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This was all first time shot. Never ran before the motor swap... So I don't have a baseline.
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Old Jul 8, 2008 | 07:24 AM
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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.
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Old Jul 9, 2008 | 08:54 PM
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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?
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Old Jul 10, 2008 | 10:29 PM
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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
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Old Jul 11, 2008 | 10:25 AM
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Look up DrX on this site. He has vast knowledge of the DWB ttbs on truck applications

Good luck,

Richard
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