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1972 Chevy Chevelle popping

Tiny
RICKSS
  • MEMBER
  • 1972 CHEVROLET CHEVELLE
Engine Performance problem
1972 Chevy Chevelle V8 Two Wheel Drive Manual

Hi, my 72 Chevelle with a 454 has a popping sound, ( small backfire) from the exhust, seems on passanger side only. When its sitting and idleing and I rev it up it seems ok but when Im driving it im getting this popping?
Any ideas?

Thanks
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Tuesday, June 30th, 2009 AT 9:19 AM

3 Replies

Tiny
BUDDYCRAIGG
  • MECHANIC
  • 2,262 POSTS
Backfire is normally a sign of being too lean
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Tuesday, June 30th, 2009 AT 10:13 AM
Tiny
RICKSS
  • MEMBER
  • 6 POSTS
Hi, its not like a backfire, its more like a popping sound. Have adjusted the carb, cannt get rid of the popping sound

Thanks
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Tuesday, June 30th, 2009 AT 10:44 AM
Tiny
LOUT5369
  • MECHANIC
  • 217 POSTS
First let me say Nice car, Have you tryed adjusting the valves, it sounds like an exhaust valve isn't closing all the way. Put a vacuum gage on it, lets see if vac is steady, if the needle is bouncing you either have a valve too tight or a broken spring. Good Luck, Lou p/s I have a 427 Impala and I love BBCs
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Wednesday, July 22nd, 2009 AT 7:13 AM

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