99 cummins no throttle response

[deerefan]

My buddy has asked me to take a look at his 99 1 ton dodge w/ a cummins and 5 spd. He is saying he has no throttle response, the truck just idles. It sounds like a throttle position sensor to me, but my cummins experience is limited. Any other issues could be causing this problem you guys may be aware of?

 

[Heywood Jannockitov]

It could be as simple as a throttle linkage rod popped off the bellcrank on the injector pump. Not uncommon on the earlier ones. If it is similar to my 95, it is a ball and socket type of connector from the rod to bellcrank. The accelerator pedal should probably feel limp if that is what happened.

 

[RollTideRam]

Sound like the injection pump. Does he have a fuel pressure gauge? Check for codes by turning the key on and off three times leaving it in the on position and look for codes on the odometer. JC

 

[tractorboy5500]

I had a 96 model, the cable comes off the little ball of the linkage on the fuel pump sometimes, and if remember right there was a recal on some of these year models. Good luck

 

[KWentling]

Is not a '99 "fly by wire"? (no mechanical linkage) Not sure what year that started. If so it could be a TPS (throttle position sensor) problem. Could also be an injection pump. Bad fuel pumps can starve the injection pump and cause failure of the injection pump. Have you checked for codes stored?

Kim

 

[DavidVT]

I have a 99. It is indeed a potentiometer.
I don't remember the reset routine but if you do a search on the site turbodieselregister.com, i bet you will find the detail there.

The foot pedal does pull a cable, but if you take the cover off on the engine where the cable terminates, you should likely see the potentimeter that tells the computer how much go juice you want.

If the cable is intact then it may very well be the pot has gone by. The computer will not like a reading out of range and should throw a CEL and even put the system into the idle only mode.

Any way, I am running off my memory and that site has tons of data. Well worth the investment if you have to pay to join it. I have been a member since I bought my truck new in 99. Yes there are other sites but I have not followed them.

Good luck.

By the way, if the truck is free of rust I might take it off his hands even with the throttle problem. Mine is almost at the point where I can't pass inspection. Darn Vermont Salt!!

 

[thatguy]

Arent the 98.5 and up yr models the ISB's engines infamous for the liftpump/injector pump issues??

I had several instances of a dead pedal and it was the injector pump going out - caused by the weak lift pump..

Brian

 

[DavidVT]

Have your friend check with this vendor. I have no experience with him but did hear of his site:

TBM Mechanical Service

Throttle position sensor or the VP44 injector pump as stated above. Have you been able to pull any codes from the computer? That might help narrow the problem down.

 

[medicshawn]

You might also try searching Dodge Diesel - Diesel Truck Resource - Cummins - Home all Dodge trucks and free unlike TDR.

 

[QueBota]

Good advice, check for codes, I would suspect the APPs sensor. Have seen quite a few of these go bad overtime.

Dave

Have your friend check with this vendor. I have no experience with him but did hear of his site:

TBM Mechanical Service

Throttle position sensor or the VP44 injector pump as stated above. Have you been able to pull any codes from the computer? That might help narrow the problem down.