When you start the truck it will idle but as soon as you give it some pedal it runs the rpm's to the roof any suggestions on what is going on?

 

I guess this is not a very common problem and I really cant see how it does it is there a speed sensor in the I/P that could be going out ?

 

No its not a very common problem. Try unplugging the FCA on the back of the CP-3 and see if that changes anything. It should be the only electrical connection on the back of the IP. If they stick it will run max rail pressure to injectors.

APPS could also be an issues. Have you checked for codes yet?

 

The shop that has it changed one injector checked for codes and who knows what else and they have no idea.

 

apps maybe needs to be reset or is going bad

 

Id say check fca on ip

 

What is the rail pressure at? That is what will help lead you to the problem. Also, a return flow test on each injector may be in order.

 

How do I do a return flow test?

 

Also how do you check and or reset apps and i do not have a rail pressure gauge

 

Resetting the APPS.
Turn the key to on, press accelerator pedal to the floor 3 times in a row very smoothly. Turn key off.
I think this is correct from what I remember. A return flow test can be done by the dealers scan tool.

 

ok will try reset on apps

 

APPS Reset Procedure
This procedure has shown to help 24 valve ISB engines. It is basically teaching the fly by wire accelerator on these trucks to reread the position of the pedal and it's limits. Most complaints this will help with is poor acceleration, improper shifting, bucking in 5 and 6 speeds. Has been known to increase fuel mileage in some instances.

1. Set parking brake
2. Disconnect negative battery cables on both batteries
3. Turn ignition key to run(to drain any remaining capacitors)
4. Let truck sit for 30 minutes( this is the recommended minimum)
5. Return ignition to OFF position
6. Reconnect both batteries and secure, not a timed event
7. Turn key to run position(not start) and depress accelerator pedal slowly all the way to the floor
8. Allow pedal to return to top position slowly
9. Turn ignition switch OFF
10.Release parking brake

I saved that for my 2 01 3500's.Should be the same for 3rd gens equipped with an apps.
If the idle is hanging high I would suspect an injector issue.