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Engine noise around 2300rpm
2017 Ford E450 with 14k on it. Just started making a noise around 2300rpm. Goes away when I accelerate. Noise sounds like tappet noise. I’ve tried different loads on the engine with AC. Close to the rpm where the engine shifts. Looked under the hood for loose plug, loose vacuum line, and can’t reproduce the noice in the driveway. Anyone have a similar noise? Any clue what it might be? Just had a oil change before trip.
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