Engine/Transmission (1998.5 - 2002) Is my VP 44 on the way out?

[Bob327]

Had a surge at idle about 3 weeks ago took my truck to the dealer found my lp was dead (no idea how long) had no idea what a lp was at that point. $400. 00 later I'm out of the shop but still had a surge at idle not as pronounced as before but still there seems to be worse if the outside temp is above 85 degrees discovered if I raised rpms at idle to about 1500 and then let it return to idle less pronounced even when hot . Concerned I have damaged my vp44 also when at cruise on the road even though I can't hear the surge the tach has a slight bounce. Any ideas?Also looking for a shop in SoCal any suggestions?

 

[SEmerson]

Recalibrate you tps first. Any codes?

 

[Bob327]

Originally posted by SEmerson

Recalibrate you tps first. Any codes?

I had already re calibrated the tps disconnected both negative cables let truck sit for about thirty minutes reconnected cables pedal slowly to floor and then slowly back up I did this after the new lp was installed I think this was in faq's? When I check for codes I get P doNE? thanks for your help

 

[SEmerson]

How much of a surge? Is you boost bouncing while cruising?

 

[Bob327]

Originally posted by SEmerson

How much of a surge? Is you boost bouncing while cruising?

before the lp about 200 rpm bounce now when its hot about 100 rpm bounce until i raise the idle and back off then I can't hear it just see it in the tach no gauges fuel pressure gauge coming

 

[dresslered]

How can any respectable dealer charge you $400 for a lift pump? If the lift pump was really bad, then this could be the downfall of your VP-44.

 

[Bob327]

Originally posted by dresslered

How can any respectable dealer charge you $400 for a lift pump? If the lift pump was really bad, then this could be the downfall of your VP-44.

247. 50 for the pump 123. 00 labor plus tax at my local dealer here in Long Beach where I purchased the truck thats why I'm looking for a new shop in SoCal

 

[Tom W]

What is your milage? Lift pumps are usually covered to 100 K

 

[Bob327]

Originally posted by Tom W

What is your milage? Lift pumps are usually covered to 100 K

105,600 when the lp was replaced

 

[SEmerson]

A lift pump is something like $120 at cummins and about 15 minutes to put on.

 

[SEmerson]

It is a good chance that it is the vp44 but no way to tell for sure at this point. Put in full gages and just drive it. Eventually it will throw codes or something to help diagnose it.

 

[Bob327]

Originally posted by SEmerson

A lift pump is something like $120 at cummins and about 15 minutes to put on.

Ignorance has been bliss for the last four years I've learned a lot about my truck in the last three

weeks

 

[Bob327]

Originally posted by SEmerson

It is a good chance that it is the vp44 but no way to tell for sure at this point. Put in full gages and just drive it. Eventually it will throw codes or something to help diagnose it.

Sounds reasonable to me I feel the vp44 was probably damaged as a result of the lp failure but its still running good at this point thanks for your help I'll continue to check for codes and get my gauges in

 

[SEmerson]

I have a vp44 that has been throwing codes for 40k now and still runs. I do now have a spare under the back seat though.

 

[gonehuntingagain]

Find someone with the Cummins VP tester. This tester unplugs the VP from the truck wiring harness, but will start the truck. This is what the dealer did to mine when it 'loped' t idle - the mechanic's write up called it a 'surge'. The truck was still loping with the tester plugged in, so they replaced the pump. No codes were set and nothing else to indicate what it was.

 

[Bob327]

Thanks I'll try that