WHY DOES MY ENGINE PING WITH LIGHT THROTTLE PRESSURE?

1996 GMC C1500

Tiny

subzero10

September, 19, 2012 AT 12:14 AM

I have the 5.0L engine with about 200,000 miles. The ping I'm experiencing is under light throttle. Under medium to heavy acceleration the pinging becomes lighter or goes away. For instance, at highway speeds with the cruise set a slight grade will make the engine ping. There are no DTC's stored in the VCM at this time. I have thoroughly checked the EGR system and found no issues. I recently Sea Foamed the engine directly and had all most no smoke produced in the process leaving me to think that carbon build up is at a minimum or less.
Thanks in advance
subzero10

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4.2 Pinging

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Tiny

ASEMaster6371

September, 19, 2012 AT 1:27 AM

Considering the age and miles, I would start with checking egr valve and passages. Then I would de carbon the motor which may be the issue

Roy

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