Let it warm up it starts popping under the hood?

Tiny
MOTOBOY227
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 190,000 MILES
Hello everyone. I'm having some weird issues. When it's cold and it starts it starts fine no issues with starting. But if I don't let it warm up for 10 minutes and I put it in gear it starts popping under the hood. And have absolutely no power. I've also noticed even after warm temperature it has almost no power. I am changing my alternator this weekend because it's on its way out and won't keep the battery charged. (Brand new optima battery less than a month old.) And shortly after that started happening the transmission started jerking. It's had a transmission flush at about 100,000 miles. Yes, it's the 4l60 and I know they have issues. I have a cap, rotor, plugs, wires, cam sensor, new filter and seal for transmission on its way in. Napa didn't have everything at one time. Is there anything I'm missing?
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Friday, December 30th, 2022 AT 9:35 PM

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Tiny
KEN L
  • ADMIN
This sounds like an engine coolant sensor could be bad and shorting out when hot or you have low fuel pressure which is common, also if you could upload s short video of the engine popping it will help me see what's going on. Here is a guide to help and I have included the location of the coolant sensor so you can check it out and I have the fuel pressure specs as well, you can rent the fuel pressure gauge for cheap or free from the auto parts store.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Key On Engine Off .................... 60-66 psi

We should run the codes as well.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Check out the images (below). Please let us know what happens.
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Saturday, December 31st, 2022 AT 2:10 PM

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