Mechanics

ENGINE NOISE

1974 Pontiac Catalina

Engine Performance problem
1974 Pontiac Catalina V8 Two Wheel Drive Automatic

When my car is runnig at idle, I have a popping noise coming from my exhaust. It soulds like my car is back firing. I checked my valves and the seem good, my spark plug and wires are good. My rocker arms aren't too tight. What else should I check
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Kpg334
July 8, 2009.




Check your rocker arms to see if they are all moving at the same rate while idling. You may have either a bent pushrod or a bad camshaft, causing the valve to not open giving you the popping sound. The pushrod also could have gone through the rocker arm.

Tiny
Hmac300
Nov 1, 2009.


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