Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 78Get this manual

Mercury Optimax 115, 135, 150, 175, DFI year 2000 and up service manual., Page 78

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IGNITION
With engine at idle, heat the TPS (with hot air gun) below the electrical connection until warm to the touchWatch for any one or combination of the following symptoms: RPM change Check