Dead Pedal at start up

[dobber911]

When i start my truck it has no throttle response (dead Pedal), I let it idle for about 5 to 10 minutes, turn off truck and restart throttle response returns and it runs great. I have replaced the Throttle position sensor and still has same issue. I have tried to check for AC noise but don't have the right tester, i have removed the 140 alternator fuse and it still has same issue, next stepp is to remove alternator and have it tested. Any other option would be greatly appreciated. 

Thank you

[Dieselfuture]

What apps sensor did you put in

[dobber911]

The box has Standard TH420. It was the only one offered at the parts store for my truck.

[Dieselfuture]

I would return it if possible and get one of these

 

Edited February 7, 2019 by Dieselfuture
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[dripley]

Have you checked for trouble codes? 

[Haggar]

Dobber,

 

Check out the Apps.  Make sure it is not the problem.

Try a different ECM.  (I was able to swap my brother's and mine to confirm it wasn't the ECM)

 

This is a failure mode of the VP.  My brother's died this way.  No codes ever.  But when cold it was dead pedal.  If you let the truck warm up, it would run normally.  VPs really rarely fail this way, but it does happen. 

 

Our mental model of the problem is a cracked solder in the wiring to the fuel metering solenoid.  Fuel volume is not increased as the apps increases voltage.   (the crack in the solder closes with the thermal expansion of the pump.  allowing it to begin working normally.) 

 

There appears to be no confirmation programming (and therefor set a code).  In most gas cars there are some lines of code that relate TPS voltage and engine speed.  (this is usually in the Idle speed control circuit, but i am seeing it more in other areas) but the code uses a bit of logic:  my commanded engine speed is increasing, but the actual engine speed is not increasing.

 

Hope you find your troubles!

 

GL

 

Hag

[Mopar1973Man]

That would help to list all active error codes this will at least point us in the right direction.