Why does my Mercury 305 CID reading continuously fluctuate between low and normal at idle RPM?
If your Mercury Engine continuously fluctuates between low and normal readings at regular intervals during idle RPM, this could be caused by a burned or leaking valve.
Why does my Mercury Engine fluctuate rapidly at idle and steadies at higher RPM?
If your Mercury Engine fluctuates rapidly at idle but steadies as the RPM increases, the valve guides may be worn.
What causes an extremely low but steady reading at idle RPM on a Mercury 305 CID Engine?
A consistently low reading at idle RPM on your Mercury Engine can be caused by: * A vacuum leak * Incorrect timing * An underpowered boat * A faulty boat bottom
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