Engine/Transmission (1998.5 - 2002) How did you cure your stumble

[diesel4power]

Keep having a stumbling problem. When I turn off my fueling box it goes away. When I turn box on and increase power level the stumble is not noticable on levels 1 and 2 but from there on up it goes from hardely noticable to real bad. I have a couple codes that are pump related 0251 and 0252, MIL comes on intermitently, may stay off for days or sometimes weeks. I did a bunch of searches on here and although it points to VP44, there are guys that did not cure stumble with a new VP. What do you all think.



Paul

 

[Turbo Tim 1]

Either your ground or pump tap connection, thats what fixed mine I had a bad ground for the box. Ended up running it to the battery and the problem was solved.

 

[24V-DSL]

Poor fuel delivery?

What are your fuel pressure readings, and have you modified your delivery system, i. e. , bigger lines, banjo's, pusher pump, etc. ?



I now believe my stumble at WOT on comp. levels 3+ is due to a lack of volume to the VP. I need a better system.

 

[diesel4power]

Not sure about fuel pressure, need to order a gauge pronto. Anybody do a soldered conection to the pump wire?

 

[JSHAW]

I had a bad stumble at higher settings until I soldered all my conections, no more stumble. Much better responce also.



Jim Shaw

 

[diesel4power]

JSHAW

How did you solder to the pump wire? it was a PIA just getting the scotch lock connector around it.

 

[JSHAW]

I moved everything out of the way that I could and very carefully stripped the VP wire then cut off the scotch lock, stripped that and slowly wrapped the wires together and soldered. The hardest part was wrapping electric tape around the end product. What I should have done was put a piece of wire loom around it taped the loom and siliconed the loom in place.