My 2007 Silverado with a 4.8 V8 is makinga tapping/knocking noise but it is not the motor.Sounds like it is connected to the exhaust system. At idle...no noise, step on the gas it taps/knocks, give it more gas and the noise stops. It can't be heard at cruising speed. Also my check engine light was on...for a while, but since the tapping...it's off.
Country: United StatesMake: GMCModel: Silverado pickupYear: 2007Engine: 4.8
Nothing. It just started.
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