I have an 07' classic LBZ, truck is 1 month old with 2100miles. I have been noticing a fairly loud ( loud enough I am noticing it and its driving me crazy) noise that happens from just off idle up throught the rpm ranges. The noise goes up and down, directly related to the RPM's.

It sounds like a gear driven cam in a built muscle car ( not that loud, but same type of sound). Its also, almost like the sound you hear on a power steering pump when its low on fuid, but I checked that is not the culpret.

Any ideas?

I have read about someone having a bad bearing in their turbo when the truck was new, and also someone posted a "whining type noise" associated with loose bolts at the exhaust head pipe joint, but I am not thinking that is my issue.... my noise definately sounds like gear noise.....


Thanks guys!

Can you drive another to compare, mine has that kind of noise as well, all the of them have some whine to them, the older ones were much louder(trans noise due to gear cut) it sounds normal, but noise's on the net are tough to hear...lol.

how very true, I love to hear people's version of guess this sound... lol

My 04.5 LLY did not make this sound, or if it did, I could not hear it since the LLY exhaust was louder than the new LBZ's.

I'd bet that it's your cp3 (injection pump). I couldn't hear mine for all the engine racket, but when I mixed some 2-stroke oil with the diesel, the engine ran so much quieter that the cp3 was audible. Like you said, it sounds like a gear driven camshaft---shouldn't be a problem.

Thanks Lizzard!

Same noise here since new. I assumed it was the Alli pump.