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Showing results for tags '6.2 tapping noise'.
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Beating a dead horse here... Have a Denali 6.2 that I just purchased from CarMax (with an extended warranty/Thank God!) Tapping sound from the start. Ran two tanks of 91 octane to eliminate possible octane knock. Took me past the 7 day return policy and 30 day standard warranty with CarMax. Didn't really bother me because of the factory warranty. Truck looked brand new. Even had the wrapping on the DVD player. Popped the hood and started looking for an exhaust leak. I found a donut/flange laying on the crossmember. Took it to the dealership. Found that the truck had two new fuel injectors and a new Catalytic Converter. Someone was searching for the cause of the sound. Dealership tightened some gaskets and said the truck was good to go. It made the deafening tapping noise on the way home. I returned the truck to the dealership. Even though I have purchased 4 vehicles from them in the past to include a current 2019 Arcadia -- they had no loaner for me. They kept the vehicle for two more days. Could not find the cause of the noise. I went back to speak with the service manager. He was not happy. He went on a ride with me and heard the noise. Claimed it was the transmission searching for the proper gear. Weird because the noise happens constantly -- to include start up and idle. Told me his 6.2 made same noises and it was normal. Finally took it back to CarMax. They sent it back to same dealer with a promise to pay for diagnostics. Miraculously, dealer finds lifters to be the issue. I'll keep updated on status of cam, etc. I think I'll trade this lemon in on a diesel or anything without AFM. Will also not be purchasing from Bob Howard GMC in Oklahoma City.- 2 replies
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