Took truck in for loopy idle.

[imported_]

I took my Dmax-01 in for loopy Idle,dealer says
the service bulletin says if it's under 100 RPM
variation to ignore it, "That's normal".The left
front tire is wearing off,again said they couldn't
find a problem,Just rotate the tires more often.
At 21000 they have been rotated twice.The steering
box is leaking,they did get a seal kit for it.
Is this a taste of the Famous GM service I hear
so much about,At least My ford dealer tried.

[conradv]

From reading different posts here, it seems that it's a crap shoot as far as service departments go. Some are absolutely stupidly horrible, and some have very good reps, like the place I bought my truck from. I could have saved about $500 by buying my truck from the giant Dave Smith in Kellogg, ID, but chose not to for service reasons.

I'd find another dealer.

[Jimamatic]

Raye,

I have an 01 2500 HD Duramax Allison. My dealer
has been great. My first problem was with launch
shudder. New one piece driveline, no problem.
Second problem, lopey idle. New fuel pump, no
problem. My truck now runs like a top. My service
writer told me that a 50 RPM lope is the max.
Have your misguided mechanic call Curt Warner
Chevrolet in Vancouver Washington to get his facts straight. I can't describe how much better
and smoother my truck works. Get a new pump,
you won't be sorry....

Jim

[Kennedy]

Hate to say it, but sounds like you'll have to grin and bear it for a while.

SoMNDmax said his tamed down with additive, but eventually it came back. Once it was back, he discontinued use of the additive which aggravated it enough to get a new pump. Pretty sure that's how it went...

[SoMnDMAX]

Yep, John's right.

Eventually it will get worse. In the interim, try another dealer. You may have better luck with them.

Try searching for the Lopey idle- some have had it easy getting the pump replaced, some not as easy. You're not the only one that's run into some difficulty. :mad: :confused: :(

[armalite]

kennedy,

what kind of additive?

[SoMnDMAX]

I'm not John, but I use FPPF Total Power. It would get rid of most of the lope.

[armalite]

Thanks SoMnDmax,

Are there any warranty issues with additives?

[imported_]

The dealer gave me a copy of the service bulletin
#P100037, DocumentID#894372,it states Idle
surges of 100 RPM or less is considered characteristic of this engine.I had the computer
ungrade,last summer,it seemed to help but now I think it's getting worse.He said mine was just under 100 so it was not necessary.I've been using deisel service fuel treatment this winter,but haven't noticed any difference.They did remove
the steering box and installed a new seal,but
now I notice pressue when I remove the PS cap.

[SoMnDMAX]

Armalite, there are, because GM prohibits the use of additives. But- out of sight, out of mind- if they don't know you use them, they will probably never easily determine you've used them. Keep with the "normal" fuel additives such as FPPF, Stanadyne, or Power Service. FPPF is my first choice, because I know it works- both in gelling prevention, mileage increases, and lubing the regulator sleeve (to get rid of the lope).

Stay away from the witches brews- brake fluid, ATF, motor oil, etc...

Raye, the bulletin is PI0037, not P10037. Did your dealer graph the desired verses actual rail pressure, and desired verses actual engine RPM as the diagnostic info requires? If not, they should.

[imported_]

Nope,they didn't check anything the bulletin
says to stop at the Rpm check if it's within
100 RPM.