Mechanics

3/4 TON PICKUP

1972 GMC C2500

I have a 1972 gmc3/4 ton longhorn pickup that just drinks gas. The carb is set to specs the timing is on however it constantally pings it is a 350 eng with a 350 trans can you help it is also a 4 barrel carb and I dont drive it hard
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Wrayrae
November 21, 2007.



Are you overheating? Find the EGR take it out and clean it and make sure its. Inoperative EGR will cause your engine to detonate/ping.

If it has a knock sensor check that out too.

Rasmataz
Nov 23, 2007.