Recent content by samseoane

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    A mercruiser 4.3l MPI with a low weak idle hard to start

    New distributor cap and rotor recently. I tried the crankshaft position sensor from the other engine since I read a post about overheating those
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    It was active when i disconnected the sensor but connected dirty or clean showed 100% power on the diagnostic
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    I pulled off the connector and noticed it has the green salt buildup did a contact cleaner with a toothbrush. The SN is ia309885
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    Fixed the sea water pump pressure sensor. Sprayed starting fluid around intake manifold and no luck on any RPM changes. Idle stays very low
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    Optimax 150 dfi IDLE SHUTOFF

    Connected the Rind test tool and I have tried the cylinder misfire test. I get no change on cylinder 4. All the other cylinders lower engine RPM
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    Optimax 150 dfi IDLE SHUTOFF

    Hello Everyone I have a 2003 150 optimax dfi. Anything above idle the engine runs with no hiccups. When returning to idle the engine almost instantly shuts off if not immediately right after. The engine starts back up no problem (new batteries) then last about 60 seconds and off again. So far...
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    im going to start another thread on my dads boat hopefully you can pitch in!
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    thanks for all the help guys a little dark here in south Florida but will definitely hit it tomorrow
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    Where would the suspect vacuum leak be and what are the bet methods to check thanks !
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    All the cylinders are between 140 And 143
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    Hey motor stays the same always surging low idle . I Attached a pic at the end of the thread showing the motor
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    i accelerated engine here a little bit to try to match other one at 600 RPM. Here it shows the IAC at 99% and Water pressure sensor 0 PSI. Both replaced REFERENCE ATTACHED
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    Hello Everyone was off the boat for a while. The compression and fuel pressure are good. im showing 140 and 43 for fuel
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    A mercruiser 4.3l MPI with a low weak idle hard to start

    Hello Everyone, I have A mercruiser 4.3l MPI with a low idle between 450 and 500. Here’s what I done so far. 2008 engine no alarms no beeps 1New Fuel Filter 2 New IAC and cleaning of the throttle area 3 fuel regulator on top with fuel rail checked for blockage no issues 4 new spark plug wires...
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    Mercruiser Alpha one Gen 2 4.3l MPI LOW Idle

    Thanks Chris. unfortunately I don’t have a Mercury computer that would be the next step if I’m out of choices a mechanic thanks Sam
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