I have recently replaced the timing belt, water pump, and driver side camshaft oil seal on my 1997 2.2CL. After reassembly and satisfactory engine start, a knocking sound is heard coming from what sounds like #4 cylinder area when quickly accelerating engine only (in Park or Neutral). It is not heard as a rod knock or anything similar when heard with a stethoscope. Noise is only heard briefly until RPM stabilizes. The noise was never heard before timing belt replacement. I am thinking possible detonation or pre-ignition. Any insight or help is greatly appreciated.
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