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Knocking sound when accelerating from a stop or low RPM.

36406 Views 13 Replies 11 Participants Last post by  RobQc
HELP! Been to 3 mechanics. Two that are GM dealers. and I have gotten 3 different answers, from its normal to it needs a high pressure fuel pump. Car runs good. But when it is warm, not cold, I get a mild knocking sound when at the lower RPM range. 1000 to 2000 RPM. I don't hear it while in neutral and revving the engine, but when accelerating in gear from a stop I hear it. I can also get the knocking noise to happen while power braking it. The slower I accelerate, I hear it more. 2012 with 50k miles, Bought it a few weeks ago, went on a trip, got home, then I noticed it. Oil is correct. One GM guy said he hears it but nothing he can do. Said engine is fine. Other GM guy said it needs the high pressure fuel pump??? Its like $500 dollars. Could a HP fuel pump make a knocking noise, while warm only, and still work fine and not leak. I have been bashing my brain for 2 weeks now trying to figure this out. I wend and drop 2 other Traverses, that did not make that noise, so I know its not normal. And I don't think its the noise that injectors make. Any ideas would be helpful. Not a CV axle, does it straight ahead as well. thx.
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I have been reading "engine noise" posts, I have 2012 and have a rattle/knocking sound when accelerating from stop. I can also brake torque it to duplicate. Drove other 2012's no noise. Dealer has confirmed as abnormal and has been great about trying to resolve but after 5 times back and 2 pages of parts I still have noise

I would describe as more like a bearing rattle. I have new frt exhaust pipe, both new frt axles, new frt mtr mount, new intake manifold, and after the last time of a 1 1/2 week drop off they basically overhauled my engine with new pistons/rods/brgs-timing chain etc.

Noise is still there.

Let me first say the dealer has been Great and has involved Technical Assistance for direction but to no avai

I'm waiting for a field engineer to inspect in person.
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