NO SPARK ON 3 PLUGS

[PLUSK100]

I HAVE A 1988 MERCURY 150 BLACK MAX-V6. RUNNING DOWN THE LAKE RUNNING FINE. BACKED OFF TO SLOW DOWN TO IDLE. AT THIS TIME,STARTED RUNNING ROUGH.TRIED TO TAKE OFF AGAIN BUT ONLY CHOCKED DOWN.I DID A TEST WHILE IDLEING. PULLED THE PLUG WIRES OFF 1 AT A TIME. LOOKING AT THE ENGINE FROM THE REAR, ALL 3 PLUGS ON THE LEFT WOULD NOT FIRE. ALL RIGHT SIDE WOULD FIRE.I ACTUALLY SWAPPED PLUGS TO TEST.SAME RESULT.I TRACED THE COIL GREEN WIRES FOR THE LEFT SIDE TO 1 OF 2 IGN. MOD..IS IT MOST LIKELY THAT THIS UNIT IS BAD?

 

[OBJ]

Re: NO SPARK ON 3 PLUGS

Hi plusk....sounds like the switch boxes (power packs in OMC/Bomby language) went south. Would be good to take it to a mech and have it checked out if yer not familiar with the workin's inside. OR....get a OEM manual for the engine and check it out yerself. Not really especially hard to do. But a manual is a plus.

 

[PLUSK100]

Re: NO SPARK ON 3 PLUGS

THANKS FOR THE INFORMATION.