EdTom

That’s actually a pretty damn accurate description

Thanks for your response back bud. This truck looks and runs great. I’ll assume those unusual sounds are normal and I’ll disregard them.

Received and reviewed your feedback on this, thank you

Hi fellas, I’ve been meaning to post this and now that I’ve heard another strange sound tonight it’s time. I’ll try to be brief. I purchased a new Sierra 1500 with a 5.3 engine in March this year. First issue, on a cold start if I’m outside the cab near the engine I hear what sounds like popping noises (like popcorn popping). When the engine warms up it purrs like a kitten and sounds normal. Took it back to the dealership and they say nothings wrong with it. Second issue, the hissing sound when a door gets opened. I’ve been told it’s the fuel pump priming. Walked by the truck yesterday without a key and didn’t open a door and heard it. Have no clue what activated it? Didn’t even touch the vehicle. Third issue, when the truck is shut off within two minutes I hear what sounds like relay’s shutting off under the dashboard (fairly loudly). Fourth issue, heard what sounded like a faint activated smoke detector like sound coming from inside the engine compartment while the vehicle was parked in the garage (faint beep, beep). Truck was parked and engine turned off an hour prior to hearing that noise. It eventually stopped. I’ve purchased three new Tahoes with 5.3s in the past and have never encountered any of these sounds. I appreciate any feedback you knowledgeable guys have with this, thanks!