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  1. #1
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    Question Mariner 225 Magnum TPS Diagnose

    96 Mariner 225 magnum efi.
    While testing the TPS I have 4.75 volts going in on the blue and yellow wire.
    With key on throttle closed I have 3.76 volts coming out on the blue with red wire. (Should be 0)
    With key on press the throttle slowly volts drop to
    .74 volts. (Should increase)
    Does this indicate a bad TPS?

  2. #2
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    Did you disconnect the 2 tan/blk head temp wires? Do you have the 91-816085 TPS test harness?

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  3. #3
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    Quote Originally Posted by Dave Strong View Post
    Did you disconnect the 2 tan/blk head temp wires? Do you have the 91-816085 TPS test harness?

    Dave
    Did not disconnect tan and black wires but will and retest. Home made test connection.

  4. #4
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    Have to disconnect those wires, tool is cheap and works great. That TPS is expensive don't want to miss diagnose.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  5. #5
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    Quote Originally Posted by Dave Strong View Post
    Have to disconnect those wires, tool is cheap and works great. That TPS is expensive don't want to miss diagnose.

    Dave
    Is the test lead a dealer item? Ebat?

  6. #6
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    Not sure about eBay, got mine from a dealer.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  7. #7
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    Quote Originally Posted by Dave Strong View Post
    Not sure about eBay, got mine from a dealer.

    Dave
    Checking eBay now

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    Quote Originally Posted by doalldoo View Post
    Checking eBay now
    Retested with test lead and tested ok. Fuel pressure is 36 one the muffs. Compression is 85, 85,85 on port side. 80,85, 90 on starboard side. Spark good on all 6.

  9. #9
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    Compression way low. Get a different gauge and retry.

    Dave
    1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
    1988 BAJA Sunsport 186, 96 225 Pro Max
    79 12' Auminum, 95 Merc 9.9
    RIP Stu
    "So many idiots, so few bullets"

  10. #10
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    Quote Originally Posted by Dave Strong View Post
    Compression way low. Get a different gauge and retry.

    Dave
    Ok will do

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