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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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  #1  
Old 03-06-2011, 12:06 PM
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Default LB7 2003 smoke at idle

In the last couple of weeks I notice some blue smoke when I am idling. It only happens when idling and engine is warmed up. I have 80,000 miles on truck and this is the first time I am having trouble with it. I changed oil and filter and also fuel filter. I keep on looking at the oil level for possible fuel leak into sump. No change. However, it might be too early to tell because I only have 70 miles on it since the last oil change. I use the right specifications and viscosity for the oil. The air filter is an after market K&N filter. No trouble codes are displayed and it gives me a "no codes" on my OBD II scanner.
Please, give me your thoughts. Would it be advisable to drive home, about 2000 miles, or should I have it repaired asap. Also if only one injector leaks should I just replace this one and don't worry about the rest.
Thanks. Hoiman
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  #2  
Old 03-07-2011, 12:17 AM
BriteWhiteRam's Avatar
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Have your injector balance rates checked.....

BriteWhiteRam's Sig:2006 Chevrolet Silverado LT 4x4 Crew, LBZ/ALLISON, PPE airbox mod, EGR blocker, EFI Live Tuned by me & Duramaxtuner
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  #3  
Old 03-07-2011, 08:21 AM
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Planning to have it scanned today to see what the injectors are doing. I am evaluating to see if I can drive it home to British Columbia where I have the tools and garage to work on it.
Thanks, BriteWhiteRam for your input.
Hoiman
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  #4  
Old 03-07-2011, 11:58 AM
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It shouldn't hurt it too badly, but just be nice to it, check the oil periodically to make sure you're not getting oil delusion, You can probably just replace the one or more that are bad, replacing all 8 would hurt
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  #5  
Old 03-11-2011, 10:12 AM
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i would repace all them if your going to replace any it would suck to get it all together and start it and end up with a fuel knock due to new and old injectors mixed

cfarley0210's Sig:2002 extended cab dmax. six speed manual. 4wd. 6" lift with 35" tires. Aam lsd carrier. straight 4 inch turbo back exhaust. juice w/additude w/stage 6 unlocked. afe hd cold air intake. Valair dual disc street clutch. ranch hand bumper.ppe valve. Modified intake horn arp head studs. soon to come 4 link coilover dodge sfa
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  #6  
Old 03-11-2011, 03:50 PM
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replace all of them, i just recently did an injector job and replaced only one (was out of specs) and the truck still smokes at idle

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  #7  
Old 03-11-2011, 04:15 PM
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i didnt want to hear that. i got one injector way out on balance rates and haze at idle. wasnt looking forward to putting that much into it just to sell it.
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  #8  
Old 03-11-2011, 04:19 PM
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Originally Posted by DieselCrawler View Post
i didnt want to hear that. i got one injector way out on balance rates and haze at idle. wasnt looking forward to putting that much into it just to sell it.

you can give it to me how it is, you dont have to sell it
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  #9  
Old 03-11-2011, 05:37 PM
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nah, was hoping to get back what i paid for it, but doubt it now. only paid 10000 for it.
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  #10  
Old 03-12-2011, 06:18 AM
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I did one on a truck and like 3 months later we were back at it again... Twice the labor for one job. It hurts but i would just do all of them.

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