no communication between the ecm and inj pump

well thats the code I get, but is it my VP?

truck runs fine except when you are really on it, then it cuts out and comes to an idle.

any clues?

 

You could try cleaning and reseating the connectors on the ECM and VP44, but I would bet that you have some overheating damage to the electronics in the VP44, not individually replaceable of course.


phox

 

I tried the cleaning and greasing of the connections...any chance this is a wiring issue or is pretty much going to be the vp44?

 

From everything I've seen and heard, I'd have to say VP44.

Sorry.


phox

 

Probably is the VP but try this anyway it cant hurt.

APPS Reset Procedure
Answer: 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

98, 24v, Ram 3500, SB Con O Fe Clutch, New NV4500 5 spd trans w all spline shaft, Edge Ez, all Iss Pro Gauges ,F.A.S.S, Air Raid Mass Air Flo Filter,Mod Air Box, L.E.D tail lamps.Jake brake, Western Hauler bed, 40gal aux fuel tank, low profile Polished aluminum tool box,25k Air Ride 5th wheel hitch,4" out pipe,Sirius satt radio,backup camera w 5"color monitor,freeze you out a/c and 3000 watts of Alpine Stereo.(Oh.... and ear plugs)and pulls a 42' Mobile Scout 412 SUT containing(Not at the same time) 02 Honda TRX250X,99 Yamaha 350 Warrior,88 Honda TRX250R,89 Honda TRX250R,97 Kawasaki KLF400 4x4 Bayou and a Dog. Giddy up! (first VP still hangin in there,On F.A.S.S. after lp departed the scene 4/ 05 *RIP*).131,000Miles & Going!

 

Odds are it's a wiring problem. This is the hardest problem to find. I believe that it will finely causer the injector pump to go out.

It could be voltage loss in the wiring, bad ecm, bad pcm and even a bad injector pump.

Good luck finding it. If you find whats wrong would you let me know. This is what seams to be the worst problem to find on these trucks.

Rodney

 

Man that is not what I wanted to hear....funny thing is I pulled my trailer about 700 miles and the first 350 it was its normal self...cutting out and throwing a check engine light. The second 350 it hasnt done it at all and now it is runing great??? I hate wiring issues but I hate $1400 inj pumps worse.

 

put in the new IP...truck runs allot better and has awesome throttle response. No problems any more