pinging give it gas

Asked by May 18, 2014 at 11:58 PM about the GMC Sierra C/K 1500

Question type: Maintenance & Repair

2 Answers

86,775

Year?

Best Answer
86,775

Have you had the intake manifold checked for vacuum leaks at the heads? On mine the gaskets pulled away and went into the crankcase so when I pulled out the PCV Valve I still got vacuum in the crankcase. It pinged terribly, replaced the gaskets and then just a slight ping pulling a a steep grade, cured that with some octane booster.

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