1974 Pontiac Catalina Engine Noise

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KPG334
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  • 1 POST
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
Jul 7, 2009 at 5:31 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
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.
Nov 1, 2009 at 1:48 AM
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