I have a 1999 GMC Suburban with 136,000 miles. 5.1 liter. The engine pings at idle or when I am accelerating or running on the highway. It seems some what intermittent. It not noticeable when the engine is cold. But when the engine warms up the knock or ping can be heard all the time. What is causing the Ping?
Wednesday, December 22nd, 2010 AT 3:59 AM