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1974 Pontiac Catalina Engine Noise

Tiny
KPG334
  • MEMBER
  • 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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Wednesday, July 8th, 2009 AT 12:31 AM

1 Reply

Tiny
HMAC300
  • 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.
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Sunday, November 1st, 2009 AT 8:48 AM

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