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Intermittent Loud (Valve Train Like)Tapping Engine Noise

Car: Honda, Acord LX, 1987, 2.0     -    Back to Fix-It    -    Honda Repair Manuals

Q.My 1987 Accord with a carburated 2.0 engine has a loud valve like tapping noise which comes and goes. I've used high quality fuel system cleaner several times thinking of possibly pre-ignition due to carbon deposits, but no results. The tapping noise will occur one day and not the next. Does anyone have any idea what could be causing this problem?..
Thanks, Paul

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