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jason chessher

idles good cold the1st 3min then idle turns goes to surging like a mis & sounds bad

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Im new to the diesel world Please help Me , when i start my truck cold it always starts right up and sounds and idles good even in cold weather , after about 3 min or so give or take idle goes to surging and misssing sounding like crap, When i put it under load miss seems to go away and idle sounds good although I do still notice a small amount of surging and you can see it on the the rpm gauge and the volt meter

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Welcom to the family. I couple of question for you. Have you checked for any trouble codes? they will help. Do you have a fuel pressure gauge and if so what kind of pressures are you running, idle and wide open throttle(wot)?

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had trouble getting the scan tool to read but messed around and got it to work p1688 , I dont have a fuel presure gauge , where do i get one , what kind , and where do i put it if it should be perment ?

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Easy way to read codes. Cycle key on, off, on, off, on The odometer will read codes if it says p done its not finding any You don't want to hear it but replacing the injection pump isn't going to agree with the checkbook http://forum.mopar1973man.com/threads/2627-P1688-Internal-Fuel-Injection-Pump-Controller-Failure --- I am here: http://maps.google.com/maps?ll=42.674866,-84.075813

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had trouble getting the scan tool to read but messed around and got it to work p1688 , I dont have a fuel presure gauge , where do i get one , what kind , and where do i put it if it should be perment ?

Ouch... :rolleyes:

P1688 code is a death code for the VP44 and it was cause from lack of fuel pressure so since the fuel pressure drop low most likely you lost the cooling ability for the electronics and burned them up.

So you going to need...

[*]Fuel pressure gauge

[*]New Lift pump (Suggest a Raptor or simular)

[*]New Injection pump

As for the fuel pressure gauge, injection pump and lift pump all the vendors here are willing to help out and get you supplies. Check out the vendors forum.

http://forum.mopar1973man.com/forums/67-Vendors-amp-Dealers

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Easy way to read codes.

Cycle key on, off, on, off, on

The odometer will read codes if it says p done its not finding any

You don't want to hear it but replacing the injection pump isn't going to agree with the checkbook

http://forum.mopar1973man.com/threads/2627-P1688-Internal-Fuel-Injection-Pump-Controller-Failure

---

I am here: http://maps.google.com/maps?ll=42.674866,-84.075813

**** yeah I no **** , pensacola injection has them rebuilt for right at a grand . my truck runs really good cold ,it acks up after its warm up and not under a load, drives fine , and goes down the road and sounds good till you release the load on the engine, it does fine , sitting still in gear it sounds good , i was just hoping , maybe there could be something else I can do to fix it , besides replaceing the pump , Hoping maybe someone at least can tell me whats wrong with the pump.

--- Update to the previous post...

The lift pump has resently been replaced with one that in the tank , but I guess that they burned up the vp44 before they replaced the lift pump

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Well the only way that will happen is you'll have to pull the pump off and send it into a place that has the test bench. There are very few places that actually have the VP44 test bench...

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When an injection pump dies there is no set symptom but rather many goofy symptoms each has its own way of letting you know it day has come but as said above the pump is dead already so no need to dwell on it just time to swap and get a fuel pressure gauge installed to help possibly prevent the next pump failure due to no fuel.

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