Hi, i have been digging around the site looking for info but cant find anyone with this problem with the LLY engine. Lots for the LB7 tho.

My 2004.5 dmax is smoking when idling after warmed up. grey puffs and a bit rough idle. i have taken it to the dealer and they keep saying they cant find a problem and just change the fuel filter and charge me 150 bucks. thing is its getting worse, and a bit embarrassing. i have 5" straight piped turbo back, K&N intake, and an edge chip. i have undid the chip and get the same issue. i find that when at idle, if i rev it up to about 1000 problem goes away. do these LLY have the same balancing issues as the LB7 issue i have been reading about? i have also tried using conditioner with no change.

Thanks for any help
Torban AB, Canada

I should also add it still goes like a raped pig:P no performance loss

Possibles:

Bad Injector(s)
Dirty Injectors - Have you tried a fuel conditioner like Power Service that will clean the injectors?
Balance Rates - get hold of scanner to check for balance rates?
Could be injector wiring harness problems?
Bad Fuel Filter

Dealer kinda charge abit more than most for the fuel filter change, however what I would do is get the injectors cleaned. A good diesel service can do this, if something is startingot happen this can be worth the hundred buck they charge....takes about a hour to do and they hook up a machine that cleans the injectors directly, the intent is to restore the injector nozzle and tip back to proper tolerance and not misbehaving...

One other thing to check is your PCV system. If it becomes restricted you will start puffing white and gray smoke.

Could the MAF have K&N filter oil on it?

Yup, if you have not cleaned the MAF sensor, I would recommend trying it just to eliminate the possibility.

I hope you are useing an ADDITIVE in your Fuel

Wow thanks for the fast help. ill check the MAF and PCV valve right away and see where that takes me.

Get rid of the K&N. Should be a sticky at the top of every page, IMO.

Bent rods maybe?

The cold air intake on the truck is a airaid. and has been cleaned like a k&n would be. can i get an air filter from afe that will fit the airaid kit? is there a bore difference?

Bent rods maybe?


WOW Fingers, I'll bet you got his butt puckered up so tight you could'nt drive a pin up it with a jack hammer right now. :eek:

I assume you mean his not mine. :D

Any updates on this issue. My truck started doing the exact same thing today. Never had any issues before.

IIRC there was an computer update that supposedly fixed this (white smoke at idle and rough idle). Mine was doing it about a year and a half ago but quit on its own.
Now it seems to be doing it again a little bit but I think it may have something to do with the cold weather in the mornings.

Cole, what part of T-town you in?

IIRC there was an computer update that supposedly fixed this (white smoke at idle and rough idle). Mine was doing it about a year and a half ago but quit on its own.
Now it seems to be doing it again a little bit but I think it may have something to do with the cold weather in the mornings.

Cole, what part of T-town you in?

I am taking mine to the dealer Monday, believe its bad injectors.
Right across the bridge goin toward Northport

They replaced my egr valve and reflashed my pcm saying they were the cause. Still does it. After reading another post I'm going to check my fuel pressure regulator.

The fuel pressure reg might be it. I've heard of that problem before.

My truck did this with the edge. When it was idling, sometimes it didnt matter whether it was warm or cold, but it would surge a bit and have rough idle on and off and puff smoke. Sometimes blue sometimes whiteish. It quit doing it on its own before I had a chance to look into it more and I havent had a problem since. And quit a few less problems since I got rid of the edge.

I did take my edge off a month ago thinking it might be the culprit. but it still does it.

Dealership said the #1 Injector was bad.

:nutkick:Well after one dealer repalceing my egr and reflashing my computer,and Not fixing it I took it to another dealer. ANSWER..... 2 bad injectors, and the Injector pump needs replaced as well. I love it when I am right. I told the first dealer to check out my fuel system and they said they only run like that if the emmissions system is fouled.

I've had the same issues with mine for the smoking. It was possible for me to smoke out a small village sitting at a stop light as it got worse.

Sorry I forgot to add that the stealer found and replaced one injector after taking it to them 3 times

I am dealing with the exact same problem and not looking forward to taking it to the dealer. That means put the cat back on change the airbox back to stock and remove the edge.:cool:

Is it me or does it seem that all the people with this problem are running the Edge?

I am dealing with the exact same problem and not looking forward to taking it to the dealer. That means put the cat back on change the airbox back to stock and remove the edge.:cool:

Is it me or does it seem that all the people with this problem are running the Edge?

I wasnt running the Edge, I was using PPE, I took it off and left my air intake and 5" exhaust on, and they didn't say anything about it.
Getting my truck back Monday hopefully.

I wasnt running the Edge, I was using PPE, I took it off and left my air intake and 5" exhaust on, and they didn't say anything about it.
Getting my truck back Monday hopefully.

You have an extended warranty or something. Mines doing it as well seams like if I put on a new fuel filter it stops for a day or two.

Mine truck was and is still stock. So I wouldn't believe it's caused from running the EDGE.

You have an extended warranty or something. Mines doing it as well seams like if I put on a new fuel filter it stops for a day or two.

I don't have the extended warranty, Duramax has 100k mile warranty. Cost me a $100 bucks to get it fixed. got it back this afternoon and seems to be running alot better.

Cole,
did you take it to Tuscaloosa Chevrolet? I used to work as the service writer there back in 1997 way before they built the new dealership.
Is Vivian still the service manager?

You said you live right accross the river toward Northport, you mean right there were the Chevy place used to be?

I still have some land down in Eutaw (the old homeplace).