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Old 10-10-2009, 11:03 AM   #1 (permalink)
remington_43040
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04 lb7 has loud noise at 2500 RPM and is using a little oi

I have a 2004 LB7 cali emissions that I have had for about 9 months and 6K miles. I don't know anything about the history except for it had injectors replaced at 128K by GM and no other work worth mentioning at the dealer. It currently has 134K on it and I have been noticing a loud noise almost like a jackhammer or machine gun or something tapping really really fast at about 2500 RPM under normal acceleration. This only happens up a hill or something, as I usually don't hit those RPM's. The noise comes and goes really fast. I'm running EFI live on it, I can't remember if it did it when I bought it, but I tried several different tunes and they all do the exact same thing. I also tried running the same tunes on my 02 LB7 which I have owned since it was born, it has never made the noise, but it isn't cali emissions. I don't know if it is something to worry about, or if it is just emissions stuff or what. This truck also uses a little bit of oil- it was full when I bought it, and is now right at the add mark after slightly over 6K on it. My 02 uses none.
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Old 10-10-2009, 01:02 PM   #2 (permalink)
Blk04HD
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Sounds like a injector knock on the noise issue, but the oil burning part i dont have any idea.
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