need help loosing power at steady speed
 

just put new lift pump, filter, and a used injector pump on that is a bosch reman. was fine for first couple hundred miles but now wen i get it warm running at steady spead normally 5gear just starts losing speed like air or somebody steeling the fuel from it. just keeps losing speed till i push clutch in and rev it up couple times then fine for couple more miles till you get at steady speed then the same thing happens. no fuel leaks that are visible and the lift pump is holding pressure. i also blocked waste gate from opening still happens. Any suggestions?

Do you have a fuel pressure gauge? what mods are done to the truck?

all i know that is done to truck is 300hp injectors, was told chipped, and turned turbo up just a bit. put a tester fuel gauge on it and drove couple miles and it done it but never lost fuel pressure.

300 hp injectors? dang those are huge! which chip do you have in there. and what was done to the turbo?

i was told 300 hp injectors not sure though. not sure on the chip or turbo either see if i can get more info was my inlaws truck they bought it new. they just said they had turbo turned up not sure wat that means maybe just chip idk

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ok found out yes 300hp injectors, turbo turned up to 63% wich is max i guess, and a program was downloaded to compensate for sending fuel. head engineer at cummins did the work. do you think i wiped out programming changing the pump?

Never heard of 300hp injectors.

Sent from my DROID BIONIC

Yeah I aint thinking they are 300HP injectors. :humm: On a stock turbo with a tune and injectors THAT big that truck would smoke like a freightrain and the EGT's would be just a little more than a little toasty. I would double check on the injector size and how much fuel pressure did you have when you checked it?

I thought injectors like 275's were 60 hp on SO trucks, and 40 hp on HO trucks?

So wouldnt 300's be 85 hp on SO, and 65 hp on HO?

Correct me if im wrong, i know throughbred sells 275 inj that give the injection pump 40 horsepower taking it from 235 to 275, and so on. :humm:

Yea i think your right that might be wat he means. The truck only seems to do it wen you hold throttle T sertain spot for lenght of time and truck has to be warmed up good and warm. Up to try anything any suggestions anyone?

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Idling was jumping like 12 to 15 and in hard pull holding 4psi

sounds like apps maybe getting a dead spot