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  1. J

    1996 merc 454 mag mpi

    If anyone could please help with this problem that would be great!! No one in Minnesota can seem to figure it out. I have a 1996 mercruiser 454 mpi mag, starts fine everytime but will not idle, unplug the map sensor and it will idle. I have good fuel pressure, new map new coolant temp sensor. No...
  2. J

    mercruiser 454 mag mpi will not start

    Ok any help will be great! Here is the problem. I have a 1996 mercruiser 454 mpi mag that will only start if you spray fuel in the plenum. I have a new tps sensor, new fuel filter, cap and rotor, compression is 150 in every cylinder. Also new mechanical lift pump. I have not scanned for codes...
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