ok guys heres what i have its a 1986 mercruiser 140, with points ignition, i have a problem with keeping it running. it will stall out on me after a few minutes on the muffs at idle, @650 rpm., i did a complete tune up to see if that would help and its still dying out on me..if i take a wire from the +12 side of the battery to the + side of the coil it will run great, whats the best way to isolate whats wrong? i disconnected my temp wire as not to burn out the points with batt voltage. i also have a mercruiser resister kit installed in the harness going to the coil.
Disconnect your boats fuel system at the engine fuel pump and hook up an outboard tank and see what it does.You could have problems with the fuel pickup, the antisiphon valve, hoses sucking air instead of fuel due to bad hoses or wrong clamps, plugged fuel tank vents or low spots in vent hose.
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You have made no mention of the coil. Did you change it. The coil is mounted close to the block and gets pretty hot after a few minutes. An intermitten coil will give you some similiar symptoms. If it is an 86 model coil it is due for a change. often mistaken for carb problems.Uncle Dave
You also need to check the resistance from the 'ON' side of the key switch to the coil "+". It sounds like you have a resistive wire going faulty. Does the engine slowly die out, or is running great then just die, like the key has been turned off?You say you have a restistive wire kit installed. Is this in series (in line) with the original or does it replace the original?Chris............
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1972 Bertram 'Bahia Mar' 20
2006 Mercruiser 4.3MPI (0W617679) w/Alpha 1 Gen II (0W829301)
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