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Die's and hard start or no start intermittently

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Old 05-25-2018, 06:19 PM   #1

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Default Die's and hard start or no start intermittently

96 Mariah 5.7 started dying or cutting out when in rough (ish) water also noticed when turning or taking off oil light would flicker. Problem with dying kept getting worse even in calmer waters. Now it wont start but will turn over. Is there a flip/tilt/impact switch that could be causing this or am I just hoping its something as simple as that? Its my B-I-L's boat and we are trying to figure out what is wrong Have checked most electrical connections but not everything yet.

Any Ideas?
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  • Old 05-26-2018, 02:13 AM   #2
     
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    Default Re: Die's and hard start or no start intermittently

    Check the fuses to see if any are loose in their socket. Mine had a few loose ones that were intermittent so I replaced both fuse blocks.
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    Thank you GaryDoug for this useful post!
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    Old 05-28-2018, 03:15 PM   #3
     
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    Default Re: Die's and hard start or no start intermittently

    Start with the basics, check fuel pressure with a gauge and check for power to the ignition coil and ecu. If missing any of the above work backward to find your issue.

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    Old 05-30-2018, 02:28 AM   #4

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    Default Re: Die's and hard start or no start intermittently

    My first thought is the fuel pump/
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    Old 09-11-2018, 07:05 PM   #5

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    Default Re: Die's and hard start or no start intermittently

    Quote:
    Originally Posted by mikeyt View Post
    My first thought is the fuel pump/
    I had a similar issue and after educating myself on boat mechanics, I found that the fuel pump has many different things running through it and to it. For example, a bad oil pressure switch could shut down the fuel pump. A bad alternator could shut down the fuel pump. A clogged fuel filter could be keeping gas from the fuel pump. A clogged fuel line could be keeping fuel from getting to the carb from fuel pump. Not to mention the electric choke also runs through the alternator/oil pressure switch...

    LOL, it is a tangled mess so I replaced everything and now my boat runs like a champ.
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