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1973 Questions for all other cars Backfiring

Tiny
ESENIOR7115
  • MEMBER
  • 1973 ALL OTHER MAKES ALL OTHER MODELS
  • 6 CYL
  • 2WD
  • MANUAL
  • 20,000 MILES
Engine works well, plenty of power. However, whenever I decelerate I get backfiring through the exhaust. I aso get a slight "pop" when turning off ignition at idle; a "bang" if I accelerate and turn off ignition.
Air pump has been disconnected.
Engine is 6 cylinder with 3 double-throat Weber carburators (one throat per cylinder).
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Saturday, August 30th, 2008 AT 4:40 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check your fuel pump pressure-could be excessive carbons/hot valves-Ignition timing incorrect, wrong sparkplug heat range, Since you disconnected the air pump that places the diverter valve inoperative to cause it to backfire during deceleration and also the air/fuel mix adjustment-
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Saturday, August 30th, 2008 AT 5:01 PM

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