04’ Lb7 smokes a lot at idle

Inkram

New member
Sep 8, 2021
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My 04’ smokes a lot at idle. It’s not always consistent, sometimes it will smoke a lot and sometimes it is just a very thin haze. Truck dose run perfectly with no symptoms of anything wrong. In the past two years I have installed a new turbo, new injectors, and new fuel filter housing. Oil change, air filter and fuel filter are changed twice a year regardless of how much I drive it. Any ideas of what it could be??
 

NevadaLLY

Adam B
Feb 24, 2019
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Reno, NV
My 04’ smokes a lot at idle. It’s not always consistent, sometimes it will smoke a lot and sometimes it is just a very thin haze. Truck dose run perfectly with no symptoms of anything wrong. In the past two years I have installed a new turbo, new injectors, and new fuel filter housing. Oil change, air filter and fuel filter are changed twice a year regardless of how much I drive it. Any ideas of what it could be??
Fill out your sig so we know what we’re looking at. Any tuning? If stock, likely an injector issue. Have you checked balance rates?
 

Inkram

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Sep 8, 2021
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What brand injectors did you install? Is this a new symptom or has it been going on for awhile?
I don’t remember what brand of injectors I had put in, they are stock replacements. The smoke started before the new injectors and hasn’t changed.
 

2004LB7

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Dec 15, 2010
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if pensacola rings a bell then it's time for new injectors. if you got them from a reputable vendor then perhaps installation contamination on the new injectors.

and as mentioned above, get us the balance rates and main fuel rate. Baro, MAF, desired and actual fuel pressure would be good too. and if you can, maybe even do a compression test
 

2004LB7

Well-known member
Dec 15, 2010
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sounds like a leaking injector. may be able to find it by pulling the glow plugs, disabling the injectors and cranking it over to see if any fuel comes out the glow plug holes
 

Inkram

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Sep 8, 2021
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This problem started before the new injectors. New injectors didn’t solve the smoke. Some days it’s good and some it looks like I’m on fire
 

sneaky98gt

Member
Nov 5, 2013
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Sounds exactly like a bad LB7 injector, or exactly as my bad LB7 injector anyway.

If you're positive that it smells like diesel, there's only a couple other possibilities. You could have a cylinder low on compression, but then you'd likely have other symptoms (down on power, fuel mileage, etc.). It could also be a fuel pressure problem (either CP3, regulator, or tuning), but again there would probably be other symptoms (rough idle, hard to start, etc.).

As mentioned already, some simple OBD2 diagnostic values would help narrow it down a lot (balance rates, main fuel rate, fuel pressure). If you don't have a scanner, you could probably get Advance or Autozone to pull them for you. Needs to be done with the truck at operating temp, in park, at idle, and with the A/C off.
 

Inkram

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Sep 8, 2021
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Yeah I’m gonna have to talk to my mechanic. I was told by my brothers Diesel mechanic that it very well could be bad cups, but I guess you can’t really test for that
 

Bdsankey

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Feb 1, 2018
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I would agree with other comments, I think it may be time for a set of injectors. Depending on the brand I've seen them be bad out of the box, fail in 1-5 months, or fail a year later as it's simply unknown with some of the crap companies. There are quite a few good companies out there, just have to know which ones to pick.
 

ZeroGravity58

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Mar 23, 2008
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I'm just venting but I see this on here and on Facebook groups. Everyone always cheaps out and buys the lowest price injectors and then are always surprised when they have to do them again in 6 months. With all the info on the internet has no one learned anything?
 
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TheBac

Why do I keep doing this?
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Apr 19, 2008
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I'm just venting but I see this on here and on Facebook groups. Everyone always cheaps out and buys the lowest price injectors and then are always surprised when they have to do them again in 6 months. With all the info on the internet has no one learned anything?
Do you really want (or need) an answer to that? :LOL:
 

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