Knocking Noise
#3
Piece of advice
A buddy of mine had been hearing the same thing on his vortex engine. It seemed as if it was the bottom end. Long story short he went and had the engine bored out and what we would call a normal fix. A fix that would stop most noises in any other motor. Not the case in a chevy 4.3 and up. When they start they have what sounds like a bottom end issue. It's normal. The fix will only lock and cease the engine up. I wouldn't believe it if I'd not seen it myself. He bought another 5.4 vortex. Same sound runs like a champ. It now has over 200,000 miles on it.
Last edited by btmathis02; August 11th, 2017 at 12:30 PM. Reason: Wrong spelling
#5
Knocking
It is the fuel pump when the car is running and you hear that thumping go to the back of the car immediately crawl underneath and listen in the fuel tank. If you feel it, you can sometimes feel the knock on the plastic fuel tank. There’s something going on with the fuel pump been there done that ended up replacing my fuel pump never heard it again yet.