400 BACKFIRING THROUGH THE CARBURETOR

1973 Pontiac Catalina

Tiny

2CarPros-Archives

October, 22, 2010 AT 8:42 PM

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?

FOUND 720 RELATED QUESTIONS

1 Answer

Tiny

2CarPros-Archives

October, 22, 2010 AT 8:46 PM

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

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