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  1. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Good afternoon, Back again The voltage on the gray wire is 6 volts and does not fluctuate when the motor is reved. Battery did Voltage goes up around 13 when the boat is at 1500 rpm The map sensor when running is showing around 11-12 when at idle and goes up when reved, I attached a pic. I...
  2. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Thank you Got dark out, i will do research on the map and take a measurement of voltage in the morning. Thank you again for your help
  3. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Another quick update, replaced the manifold air temp sensor with another new one and it is now reading fine at 72 degrees ( must have been bad). but motor is still running very rich Thank you again for your help
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    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Update Replaced the IAC, it idles all over between at 600-800 rpm and is running very rich. Thinking it might be bad temp sender reading too cold , Replaced the temp sender (computer side ) and the map sensor with no changes Have a friend with a diacom come over and and got 4 codes 22...
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    2000 MERCRUISER TBI 5.7 injectors quit at idle

    I pulled the IAC valve from the throttle body, plugged it back into the harness and hit the key. It didn't move at all. I will get a replacement in the morning. Thank you again for your help.
  6. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Was able to get the fuel pressure reading. I pulled that fuel pressure sensor and hooked up a guage, pressure when key turned on went to 30, When started ( still running at 1800 to 2000 rpm at idle) , it’s right at 30, Shutting it off, it goes down to around 28 and holds there with key off.
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    2000 MERCRUISER TBI 5.7 injectors quit at idle

    The plug that I put the “jumper” cap on is purple and black wires, These do not go to the IAC, the IAC has 4 thin wires of two blue and two green. I attached pics
  8. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    While getting ready starting to pull the sensor to take the fuel pressure, I found a 2 prong plug with no where to plug into. I have another of these motors in a different boat that has the same harness with the cap covering this plug. It has a single wire that just seems to close the loop on...
  9. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Whoops Serial number is 0L316174. thank you for your help
  10. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Thank you for your help. Engine serial number 0L502971 I will get that adapter and get fuel pressure checked and will update you. I do not see a plug that I can attach a pressure guage to.
  11. R

    2000 MERCRUISER TBI 5.7 injectors quit at idle

    Good morning, Just got a 2000 230 Searay with a 5.7 TBI and bravo outdrive, 230 hours, no prior knowledge of how it ran other than said, "it needs a tune up". The motor appeared to run rich and had high idle around 1300-1500, but would run decent up to full throttle at 4600 rpm. Next day it...
  12. R

    2005 mercury 50 horse running on one cylinder

    Have a 2005 50 horse mercury 2 stroke model 50elpto 3 cylinder that is running on the top cylinder only. This motor was just bought and I do not have any prior knowledge of how it ran before. Pulling the plug wires on two and three give only a very small difference. Stalls immediately when...
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