1973 PONTIAC CATALINA 400 BACKFIRING THROUGH THE CARBURETOR

  • Tiny
  • 2CarPros-Archives
  • 1973 Pontiac Catalina
  • V8
  • 2WD
  • automatic
  • 140,000 miles

1973 Pontiac Catalina 400 mileage: 140,000. My car is backfiring through the carburetor. I have changed the timing chain and gears, the plug wires, plugs, rotor, distributor cap, points, set the timing, and cleaned my carburetor. After all of this it is noticeably better, but still has the backfire. What else is there to do or check?

Friday, October 22nd, 2010 AT 8:42 PM

1 Answer

  • Tiny
  • 2CarPros-Archives
  • Member

Do a compression check; check for broken valve springs and for a flat cam.

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Friday, October 22nd, 2010 AT 8:46 PM

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