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    Mercruiser ECM replacement?

    Well thanks to all of you and especially alldodge problem is solved! Boat idles great and accelerates super fast! I really can't thank you enough, appreciate all your help and knowledge. Regards, Kostas
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    Mercruiser ECM replacement?

    alldodge, Regulator replaced, pressure now steady at 30psi... Just like you said it would be. Next task: test ride!
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    Mercruiser ECM replacement?

    Fixed!
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    Mercruiser ECM replacement?

    alldodge, Attached a gauge to measure fuel pressure while engine was running. Please check the attached video... Already ordered a new fuel pressure regulator (by the way the one found in the fuel cooler is made in Japan by kei hin). It is the proper thing to do, right? Kostas
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    Mercruiser ECM replacement?

    alldodge, So is there a problem with both the Throttle Position Sensor and the Idle Air Control valve? Regards
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    Mercruiser ECM replacement?

    alldodge, Thank you for your answer. The gauge's pressure was indeed bleeding down slowly, but I think it was due to the banjos I used to connect the fuel hose. I used a towel and got wet with fuel right where the connection was. I didn't know that the pressure should at no times reach more than...
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    Mercruiser ECM replacement?

    Can please someone comment? :(
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    Mercruiser ECM replacement?

    alldodge, Connected the fuel pressure gauge, turned the ignition key and the gauge wrote 55 for one or two seconds and the stalled at 30. So I guess the pump and regulator are fine.
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    Mercruiser ECM replacement?

    I succeeded communicating with the DLC using the paperclip and a led light.... Codes I got are: "12", "21" & "42" Any translation?
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    Mercruiser ECM replacement?

    Lou C, Oil's colour seemed fine, the smell though... Is it possible to have a scent of petrol? Kostas
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    Mercruiser ECM replacement?

    Chris, Did as you suggested and then reassembled...
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    Mercruiser ECM replacement?

    Lou C, Will do and report back! Cheers
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    Mercruiser ECM replacement?

    Didn't take the valve covers off, should I?
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    Mercruiser ECM replacement?

    Either way, should I take the manifold off and have it cleaned?
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    Mercruiser ECM replacement?

    Chris, Most definitely it is rain water. When I purchased the boat the engine room cover was rotten and rain water was coming in the engine. Seems like rain water found its way inside the intake manifold through the throttle body. Kostas
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    Mercruiser ECM replacement?

    Well I guessed right. Should I clean this? Does the manifold need to come off too?
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    Mercruiser ECM replacement?

    Took the throttle body and the adaptor assembly off to replace the gaskets and noticed rust marks inside the intake manifold, is this usual? Please take a look at the pictures... Many thanks,
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    Mercruiser ECM replacement?

    So i remove the plug (smaller diameter of the two inlets) and connect the fuel pressure gauge, turn the ignition so the fuel pump can pressurize fuel and take measurements? Should I start the engine also? Problem is I don't think there is such an option here locally. (I'm in Greece by the way)...
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    Mercruiser ECM replacement?

    alldodge, Thank you for your answer. As already mentioned, I bought the rebuilted kit of injectors from an ebay seller with 100% positive feedback. The cost of oem injectors is way high, so took a chance. Indeed maybe the injectors are junk but isn't there a way to test and be sure? Is there a...
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    Mercruiser ECM replacement?

    Many thanks for your suggestions. Bought and replaced the engine temperature sensor last weekend (picture 1), had already replaced the distributor sensor last year and finally bought the map sensor and will be replacing it also next week. Engine started effortlessly, was idling perfect and the...
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