1973 QUESTIONS FOR ALL CARS BACKFIRING

  • Tiny
  • esenior7115
  • 1973 All Other Makes All Other Models

Engine Mechanical problem
1973 Questions for all other cars 6 cyl Two Wheel Drive 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
  • Member

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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