ENGINE NOISE

1974 Pontiac Catalina

Tiny

kpg334

July, 8, 2009 AT 12:31 AM

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

FOUND 1819 RELATED QUESTIONS

1 Answer

Tiny

hmac300

November, 1, 2009 AT 8:48 AM

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.

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