Derek Roch

Ok, I have a un-steady idle, not rough, engine does not shake and its not really a miss more like a loss of rythm. Its really hard to describe. I so far have re-set the TPS, checked all injection line fittings, replaced all six injectors with jammer 1's, re-set the ECM, disconnected my edge box, put the map sensor out of my brothers truck into mine, replaced all six injection line crossover tubes, I have an airdog fuel system with a steady 16psi and I am completely out of ideas. Any information and/or ideas would be greatly apperciated. Oh by the way its a 2001, 24v H.O.

graphitecumnz

what codes, if any, do you have??

Rauschbo

Could the VP be operating on an intermittent fashion? There may be some way to check the signal in, to make sure that it is steady, but as for checking the output......??

storx

mine did the same thing but got to the point that it sounded like a huge cam in the truck at idle.. was pretty cool sounding when you have straight pipe exhuast but it ended up being bad ground on ECM, also there was noise from the alternator i wrapped like 3/4" of aluminum foil around the brownish ground wire going to the left battery. This will help with transmission seeking aswell if you have this problem aslo. Then i checked every ground wire and put die electric grease in the connectors that are on grounding cables in the engine bay. This fixed my problem.... ill see if i can actually find the video i made of the truck when it did it.

graphitecumnz

Kinda what I was thinking. When my VP went, I had a fluctuating idle situation. The tach would bounce up and down... it was even noticeable when I'd set the cruise control. When the VP actually died, it had a huge lope like a big block with a cam.

RickCJ

If the check engine light isn't on it's not bad enough to worry about!

rebal

it is possable the the larger injectors are doing it and the VP is trying to compansate for the added extra fuel at idle!

derek840378

hey, his name is my name, too! got a ticket in brazoria once

singleturnout

have the same problem to,pretty cool suonding through

dsl kicks gas

the bigger injectors shoul smoth out the idle, unless there like 150hp over stock or somethin, i know my 275's idle smother than my old dirty stock ones. and thats about the same as the stage 1's.

Derek Roch

I dont have any codes...Something that I forgot to mention..The truck does not do it when the engine is cold...In the morning it idle's smooth as glass for the first 5 to 10 minutes then starts acting up. As for the ground wires to the ECM where are they and how many of them are there??? Thanks for the help...

graphitecumnz

Yet another symptom of a failing/dead injection pump. Mine truck would be just fine until the engine had fully come up to temperature or when the ambient temperature was fairly warm.

NoSeeUm

Mine does the exact oposite thing. I get the "rump-rump-rump" idle until it warms up, then it purrs like a kitten. It got more noticable after I installed the M1's.

I had heard that the loping idle when warmed up, but not cold, is a warning sign to a possible VP failure. I checked the grid heaters and they appear to be getting hot, plus all the usual fuel leaks.

Any ideas, what's my problem?

Jim

coalburner400

What a positive outlook

Sask

Hmmm, mine is doing somewhat the same thing - a miss at speed and a slightly rough idle - but only after the truck warms up - or after you drive it and shut it off, and then start it up again.

It's not the injection pump - I replaced mine 5000 miles ago, and the new unit tests out fine. I thought perhaps it was the IAT sensor, but I replaced that and although it steadied out some, it's still missing.