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Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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The last two weeks my truck has been blowing blue smoke when I'm stopped at stop lights (at least this is when I notice it). Basically it will blow clouds of blue smoke for a few seconds, and then it will stop for 15 or ... JOIN NOW TO REMOVE TRACER

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  #1  
Old 08-13-2008, 10:22 PM
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Default Blue Smoke At Idle

The last two weeks my truck has been blowing blue smoke when I'm stopped at stop lights (at least this is when I notice it). Basically it will blow clouds of blue smoke for a few seconds, and then it will stop for 15 or 20 seconds. then it will start smoking again. I can not see or smell any diesel in the oil. So is the general consensus I have an injector going bad? Could this be caused by bad fuel? The truck still runs great and I am getting good MPG.
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  #2  
Old 08-14-2008, 01:08 AM
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sounds like injectors, take off any programmers you may have and take it to the dealer, if they dont change them, take it to another dealer

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  #3  
Old 08-14-2008, 10:29 AM
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You could also find somebody in you area with a techII, predator, quad stealth II, PPE, EFI Live to check the balance rates. if you really want to try some ideas throw in some 2 stroke oil when u fill up about one oz to one gallon ratio.
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  #4  
Old 08-20-2008, 11:07 PM
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x2....exactly.

The first set I had that went bad was netting 21.7 mpg. White smoke of course, but.........

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  #5  
Old 08-27-2008, 04:12 PM
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Any updates???

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  #6  
Old 08-30-2008, 03:58 PM
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No, it still smokes, and I have been to busy to take everything off the truck to take it to the dealer. I might try to find a used predator to check my balance rates myself.

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  #7  
Old 08-30-2008, 04:15 PM
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make sure to heck them when ect's are above 160* and they should be -/+4 in park at idle and -/+6 in drive at idle
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  #8  
Old 09-12-2008, 11:03 AM
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I finally got around to check them.
Engine temp 172 F
Park --------- Drive
1 -4.03 --------- -4.5
2 0.2 --------- 2.74
3 -2.74 -------- -3.86
4 0.7 -------- -3.1
5 -1.74 -------- -3.42
6 0.18 -------- 0.97
7 -1.01 -------- -1.38
8 3.42 -------- 5.23

What does the mm stand for after the measurement?
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Old 09-12-2008, 11:35 AM
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Your #8 injector is still within spec but getting close to being out. BTW- dont check your balance rates in park. The figures will lie to you. The first thing you need to check here before spending a bunch of time and money on hard parts is to check your PCV system. If its plugged or restricted you will get smoke at idle.

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  #10  
Old 09-12-2008, 11:39 AM
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Is it possible to do a PCV Reroute on the LB7? Might be a cheap fix to look into

I thought the LB7 didnt have a PCV System.. I could very possibly be wrong though.. that happens alot.

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Last edited by Oilfield_Mafia; 09-12-2008 at 11:43 AM..
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