Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Engine pinging. Fuel trims and more…. › Engine pinging. Fuel trims and more…. October 13, 2019 at 9:17 pm #894674 BillyParticipant If it’s pinging at the same time it’s making negative fuel corrections, I would suspect a bad O2 sensor or MAP sensor. You can check the MAP sensor against a vacuum gauge.