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  1. #1
    Member
    Join Date
    Jun 2018
    Location
    New Jersey
    Posts
    2

    Praying Opti 150 Rpm lost

    Hey, give a quick intro on the boat/motor
    1995 Robalo 1820
    08 optimax 150 sn# 1b692183- 200hrs

    Going for a combine weight (ppl/gas/gear) a little over 4000lbs so I have a mirage plus 14.75, 17pitch prop

    Here's the issue I was out running Wot (5400rpm) for about 5 mins when I felt the motor lose power and dropped to 4800rpm, trimming it I get a max 4950. The following day I notice that it would stall when I turned it on but if I put it in neutral and kick it up to around 650-750rpm it would stay running and not stall. When I shift it to gear it'll stall if I don't quick kick it up to 700-1000rpm.
    Run smoothly from 700rpm-2000rpm. When it hits 2000rpm the motor starts to shake and sound weak and as I shift forward cant feel any power I guess like a dead spot. It kick up at 3000-3750 rpm and get on plane quickly but I can get it to go pass 4950 rpm. Also when I shift into reverse I need to shift all the way down to get the motor to react.

    I've check compression all 110-115, change spark plug, water pump, poppet valve, thermostats, fuel filter. While the engine was on I pulled the DI plug and each one causes the engine to slow till I plugged it back. I used an inline spark tester on all the coils & all sparked. Check the fuel/air pressure 88/78

    Could it be a bad tps, injectors? any help would be a Big help

    Thanks

  2. Member
    Join Date
    Mar 2012
    Location
    Pelham, GA
    Posts
    2,003
    #2
    Compressor?
    Mercury 2002 200hp Carbed Saltwater
    OT566776
    2002 Cape Horn 22' Bay

  3. Member
    Join Date
    Jun 2013
    Location
    LONGVIEW TEXAS
    Posts
    13,917
    #3
    check for fuel in air side of system
    .................................................. ...the scariest thing in life is the unknown ...................................

  4. Member
    Join Date
    Jun 2018
    Location
    New Jersey
    Posts
    2
    #4
    Is there a way to check If the compressor is shot? When i check for air side for fuel should it be in gear of is neutral fine?

  5. Mercury 3L/4 Stroke/Verado Moderator EuropeanAM's Avatar
    Join Date
    Apr 2008
    Location
    Greenville, SC (US)
    Posts
    94,834
    #5
    Quote Originally Posted by JOE54 View Post
    check for fuel in air side of system
    This would be a good starting point. ^^^^^


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