Spark Knock Or Ping
EGR valve leaking at mounting or internally. VCV or TVS malfunction. Plugged or restricted passage ways or ports. Exhaust leaks provide insufficient backpressure to activate valve. Ignition timing too far advanced.
EGR valve leaking at mounting or internally. VCV or TVS malfunction. Plugged or restricted passage ways or ports. Exhaust leaks provide insufficient backpressure to activate valve. Ignition timing too far advanced.