symptoms of failing injectors? - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 09-28-2008, 05:32 PM   eBay Motors  #1 (permalink)
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symptoms of failing injectors?

my lb7 has 213k kms (130k miles) on it and i think im finally experiencing what i think are injector or pump issues. basically the truck feels like it needs an oil change all the time (even right after i changed the oil and fuel filter).

-grey smoke at idle (never smoked before except below freezing)
-odd shift points (up and down shifting. usually high revving)
-a loss of 2 mpg
-auxillary fan turns on at start up until engine is warmed up (randomly, not dependent of outside temp or last time truck was driven)

as far as i know my injectors should be covered by the recall. if that is what the problem is.
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Old 09-28-2008, 09:25 PM   eBay Motors  #2 (permalink)
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Hmmm the mpg loss and grey smoke would go towards injectors but I cant think of what would cause the strange shift patterns or the fan is really unusual. You'll definatly have to take it in and get the injectors looked at!
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Old 09-28-2008, 09:58 PM   eBay Motors  #3 (permalink)
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Maybe your spin-on needs replacing,for the hanging shifts..IDK High return rates tell of shot injectors.Balance rates fluctuate a bit on idle.I'd have it checked before bigger problems arise....
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Old 09-28-2008, 10:10 PM   eBay Motors  #4 (permalink)
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See if the oil dipstick smells like diesel, if it does its a surefire way of knowing your injectors are shot- thats what happened to mine. If this does happen, buy a good remote filter if you plan on keeping the truck, a lube additive would be good too (Opti-lube XPD is what I use).
By the way, did you notice an increase in MPG or power with the Fitch fuel catalyst?
Good luck
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Old 09-29-2008, 12:26 AM   eBay Motors  #5 (permalink)
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i didnt notice anything huge with the fitch horsepower/ torque wise (kinda minute considering the power these beasts already make)...but it did make about 2mpg better on winter diesel and about .5 mpg better on summer diesel. and my oil stays cleaner longer

i figured the odd shift patterns were a lack of power related thing do to the possibility of bad injectors

the fan only does that weird thing probably once every two weeks or so using the vehicle 3-5 times a day. it seams like its putting extra load ont he engine to warm it up faster but it never did that before.

im definitely getting it in soon, just wanted some opinions
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Old 09-29-2008, 09:27 PM   eBay Motors  #6 (permalink)
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i just got injectors in my dmax today i didnt notice they where out untill i bought my tuner. when i got a tuner i would change my tune and get no performance. after a fuel filter and phone calls to PPE we narrowed it down to injectors but never had a problem running stock. have your dealer check them they are warrentied for 200,000 or 7years
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Old 09-30-2008, 08:21 PM   eBay Motors  #7 (permalink)
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Does anybody know if all GM dealers will be able to check them and an average cost to have it done? I don't think mine are acting up but would like to get them checked?
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Old 09-30-2008, 09:11 PM   eBay Motors  #8 (permalink)
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well as far as i can understand there is a recall on our years of injectors and the dealer should do all the work and cover core charges and replace the injectors at their expense...

they wont do the work unless there is a problem because its at their expense.
i think that is what your getting at :S
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Old 09-30-2008, 09:13 PM   eBay Motors  #9 (permalink)
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Yep thats what I wanted to know. Thanks much
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Old 09-30-2008, 09:30 PM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by dawsonX View Post
Does anybody know if all GM dealers will be able to check them and an average cost to have it done? I don't think mine are acting up but would like to get them checked?
Have them check the fuel return rates.........can be done with the tech two. Customer pay is usually around $3500 FOR INJECTORS AND 10 HOURS LABOR.
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