Pinging

1995 CADILLAC DEVILLE
185,000 MILES • 4.9L • V8 • FWD • AUTOMATIC
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GREG HALLATT
  • MEMBER
  • 6 POSTS
Replaced plugs, wires, map sensor, cleaned mass air flow, verified timing to factory specs and had replaced EGR valve about 20 months ago (could that have gone bad again in that time?)....what else might be causing vehicle to ping? Oh, and compression is ok.
Only pings during hot weather. Thank you
Aug 24, 2016 at 8:42 AM
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WRENCHTECH
  • ✓Experienced Mechanic
  • 20,760 POSTS
Replacing the EGR valve doesn't insure the passage is not restricted preventing the system from working properly.

Carbon built up, high engine temps and low octane fuel are the other causes.
Aug 24, 2016 at 8:56 AM
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