loud knocking/smoking e-way breakdown - 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 11-25-2012, 05:44 AM   eBay Motors  #1 (permalink)
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loud knocking/smoking e-way breakdown

This truck is killing my trust.

2004 LB7

8 injectors done in 2010

Cyls 1,3,5,7 done in 2011

Thanksgiving day i passed a vehicle and noticed a puff of black smoke.

I get off the gas and its knocking. Bad. Instantly knocks upon startup and is not driveable. Chugs black smoke too.

No codes are being thrown.

Truck got towed 150miles and is now at the diesel shop.

Any suggestions?
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Old 11-25-2012, 06:11 AM   eBay Motors  #2 (permalink)
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Balance rates checking out?
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Old 11-25-2012, 07:35 AM   eBay Motors  #3 (permalink)
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Balance rates checking out?
I'm not sure what that is bud
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Old 11-25-2012, 07:54 AM   eBay Motors  #4 (permalink)
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Moving to LB7-- truck is in shop.
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Old 11-25-2012, 08:01 AM   eBay Motors  #5 (permalink)
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The FICM balances the injectors to keep down harmonic vibrations in the crank. If an injector is going bad the rate at which it injects fuel is compromised and the FICM will pull or add fuel to try and keep the crank balanced. Anything + or - 4.0 is considered out of spec and needs to be replaced. Have the shop tell you the balance rates...
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Old 11-25-2012, 09:44 AM   eBay Motors  #6 (permalink)
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Originally Posted by smokinlmm View Post
The FICM balances the injectors to keep down harmonic vibrations in the crank. If an injector is going bad the rate at which it injects fuel is compromised and the FICM will pull or add fuel to try and keep the crank balanced. Anything + or - 4.0 is considered out of spec and needs to be replaced. Have the shop tell you the balance rates...
Will do, thanks for the info! I want to be able to approach as many questions as possible..

Should I look into such things as the harness shorting out around alternator and/or the ice pick trick?
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Old 11-25-2012, 10:02 AM   eBay Motors  #7 (permalink)
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Did you put remans or did you get new injectors. And are they bosch s
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Old 11-25-2012, 10:46 AM   eBay Motors  #8 (permalink)
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mine did the same thing but my injection pump blew up throwing metal shavings into my injectors causing the injectors not to fully close
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Old 11-25-2012, 11:49 AM   eBay Motors  #9 (permalink)
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Originally Posted by 87sheerips View Post
Will do, thanks for the info! I want to be able to approach as many questions as possible..

Should I look into such things as the harness shorting out around alternator and/or the ice pick trick?
That's an LLY issue not Lb7...
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Old 11-25-2012, 01:50 PM   eBay Motors  #10 (permalink)
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Did you put remans or did you get new injectors. And are they bosch s
The work was performed at a dealer thru the previous owner. Do they use a standard replacement or do you have the option of remans?
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