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I could really use some help, mine...
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12-29-2019 10:20 AM
I could really use some help, mine is a 2005 Sundeck 200 with Merc 5.0: MPI and we enjoy the boat and don't really need anything more. But, there is one problem that is incredibly annoying that I can't seem to trace down. I have 2 Chevy 350s sitting in the garage and they start at the first turn of the key. The boat normally starts a bit hard for a fuel injected engine and about 2 or 3 times a year it won't start at all and seems flooded to me. It sits on a boat lift near Destin FL.
Here is the common scenario: it hasn't been started for 2-3 weeks and tries to start after cranking 2 or 3 seconds then sputters and dies. From there it is almost certainly not going to start but continues to sputter when I try. Once running it never has a problem or if it has recently ran its fine. Plugs get replaced every year so I don't really think that is the problem. Last summer I put a fuel pressure gauge on it but got strange readings although the engine was running at the time. Could this be an injector problem? What am I missing please?
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12-29-2019 10:21 AM
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12-30-2019 03:56 PM
Refer to the engine FSM. It will specify the fuel pressure, plus it frequently also specifies the fuel pressure bleed down w/ the engine off.
On mine, the fuel pressure is solid, running or static. On mine, there is a vacuum-controlled fuel pressure regulator, connected to a very poorly designed vacuum system. (I discovered that system needs thorough annual cleaning to maintain proper operation.)
Have the fuel filters been replaced?
Nothing wrong w/ getting fuel injectors tested and cleaned. I was having performance issues, sent all 16 out to a pro for cleaning and testing, he found several bad, plus poor operation on most / all.
After that injector service, plus other problem resolutions, my engines have been solid performers.
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12-30-2019 04:20 PM
BTW, how do you monitor your engine FSM? I don't have a way to do that but could purchase a monitor if needed.
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12-30-2019 07:31 PM
The Engine Control Module (ECM) controls the engine, based on all the sensors, including the throttle position sensor, to provide proper operation.
There are diagnostic tools to interrogate / control the ECM. I use the Mercruiser Digital Diagnostic Terminal (DDT).
https://live.staticflickr.com/4357/36075822920_55df4c9044_c.jpg
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01-05-2020 04:52 AM
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01-05-2020 06:57 AM
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01-05-2020 07:49 AM
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01-05-2020 08:24 AM
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01-05-2020 09:59 AM
