Knocking and black smoke...
I have a 2003 LB7 motor that has a knock in the #7 or 8 cylinder, and it is blowing black smoke, still runs good, but knocks. I pulled the pan on the motor there are no metal shavings whatsoever in the pan, Not sure what it is? I was told if it was an injector tip its possible but im stumped? any ideas???
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Sounds like an injector related issue. Done any modifications, such as a programmer or module??
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Re:
No mods, i suppose i can pull the injectors and look them over next...:bat:
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If you have a tech 2, efi live, ppe, quad stealth 2, predator tuners you can check the balance rates on the injectors
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Possible he blew the tip on one or more of the injector nozzles??
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the way it sounds its a injector problem. we hace alot of lb7 duramaxs come into the shop with injector problems. there warrantyed up to 200,00 miles..
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i would take the truck into the shop and get some new injectors
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sounds like new injectors are in the near future.
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Gm has a warrantie of 200,000 miles or 7 years i would take it in and have it done before your warrantie runs out.
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If this is the motor for the 70 Chev conversion, would GM still honor the warranty on just the motor? :humm: :pca1:
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