Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Engine pinging. Fuel trims and more…. › Engine pinging. Fuel trims and more…. October 11, 2019 at 4:57 am #894665 BillyParticipant I would check MAF voltage against spec for expected airflow at high RPM. Or swap in a known good MAF sensor if available. BTW, your English is perfect; not sure what you’re talking about there.