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

Injectors maybe???

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Old 11-18-2010, 07:05 PM
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help Injectors maybe???

Ok, i've been holding out long enough...

Yesterday when i cranked the truck for the first time of the day, walking back from the dog pen, i noticed smalls puffs of white smoke from my exhaust tip - barely noticable... I know on gassers, this is just condensation burning off or steam... Is that the case with diesels too? or is there a chance my injectors are going bad... I have had a slight loss in performance lately (maybe 10% loss), but really no other signs of problems...

I've got straight pipe exhaust, stock motor, and about 141,000 miles... Help please! Thanks
 
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Old 11-18-2010, 08:27 PM
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id start with the fuel filter..have the injectors ever been replaced?
 
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Old 11-18-2010, 08:31 PM
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what fuel u runnin bio or diesel big diff.
 
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Old 11-18-2010, 08:41 PM
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yes you could be burning off some condensation but i see you are in florida. most of the time that will happen in colder climates. i know duramax had trouble with injectors so i wouldnt count that out.
 
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Old 11-19-2010, 03:14 PM
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Fuel filter has less than 1200 miles on it, oil and filter has less than 1200 miles on it, injectors have never been touched as far as i know... And as for bio-diesel, that's a NO... I run straight diesel...

It's been running good today but i really have to lay on the throttle to get it up and out of it's own way, otherwise i still have the loss of power... and as for the smoke, like i said before, it's only minimal... you can barely notice it, almost like only one cylinder is smoking...

Just incase this is the problem or helps the problem...I am getting a code for the glow plug circuit A... I have not tested this plug or relay yet... If i need to do this first, then let me know and i will do it... I'll probably do the glow plug thing tomorrow either way...

Thanks for the input... please feed me more if you know anything... Thanks again
 
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Old 11-21-2010, 03:36 PM
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diesel will began to collect in the crank case so i owuldnt worry much until you start seeing exra oil or substances on the dip stick until i would drive it but pay close attention to your oil pressure!
 
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Old 11-21-2010, 03:42 PM
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Default Re: Injectors maybe???

Yea check your oil. Touch your dip stick to white papaer towel. If the liquid is obsorbed and travels accros the paper you have fuel in oil

Sent from my Droid
 
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Old 11-22-2010, 02:28 PM
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does fuel in the oil mean bad injectors??? i will check asap and post the oil consistancy... I do loose oil pressure when at idle - it drops to like 25-30 psi, but as soon as i rev to any RPMS it jumps back up to 70-80 psi... its done that since i've had it tho (about 128,000 miles)... as always, thanks for the help!
 
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Old 11-22-2010, 04:06 PM
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Default Re: Injectors maybe???

Thats how the dealership found out mine went bad. Keep us updated
 
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Old 11-24-2010, 07:25 PM
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I dabbed some oil off the dipstick today... It didn't seem abnormal - i guess!!! it traveled some (like 1/16th of an inch from the dipstick) but held it's consistancy... It has no strong smell of anything, wouldn't it smell like diesel??? I'm lost now, maybe i'll jump on that glow plug and see what that does for me... Please, any more info would be awesome... Thanks again
 
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