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1972 GMC 3/4 ton Pickup

Tiny
WRAYRAE
  • MEMBER
  • 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
Wednesday, November 21st, 2007 AT 5:14 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Friday, November 23rd, 2007 AT 8:26 AM

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