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Old 12 July 2013, 10:07   #1
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Mariner 150 Optimax Problem HELP!!

We have a Mariner 150 Optimax that's giving us a bit of grief.

We just cant seam to understand whats wrong with it. Put the computer on and no faults are registering.

The engine did have a overheating problem but after changing the thermostats and the impeller the cooling issue seams to have resolved itself.
Also we have put a new cranking battery on her as the old one was a leisure battery.

Symptoms now are when shes started everything is ok. Runs sweet as a nut. Had her running for about 45 mins and turned her off to do a spot of fishing. Started her up again went along nicely until revs dropped to 3000 rpm and wont go over.


can anyone help??
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Old 12 July 2013, 10:12   #2
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Quote:
Originally Posted by quietsparrow View Post
We have a Mariner 150 Optimax that's giving us a bit of grief.

We just cant seam to understand whats wrong with it. Put the computer on and no faults are registering.

The engine did have a overheating problem but after changing the thermostats and the impeller the cooling issue seams to have resolved itself.
Also we have put a new cranking battery on her as the old one was a leisure battery.

Symptoms now are when shes started everything is ok. Runs sweet as a nut. Had her running for about 45 mins and turned her off to do a spot of fishing. Started her up again went along nicely until revs dropped to 3000 rpm and wont go over.


can anyone help??
Sounds like safe mode
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Old 12 July 2013, 10:25   #3
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Yeah the computer says its not in guardian mode.
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Old 12 July 2013, 10:59   #4
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Could be fuel. Check primer and also I had similar years ago was diaphragm so maybe check that also the kit ant expensive and easy to change if your handy.

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Old 12 July 2013, 11:03   #5
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Had similar on my 200 twice (once in hot weather and once in Sub zero temps) . I'd suggest a fueling issue . I sorted by swapping the main inline filter and primer bulb and pipe between the two.
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Old 12 July 2013, 11:46   #6
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Note: there are 3 fuel pumps, mechanical lift pump then an electrical low pressure and then the high pressure pump in the vapor chamber..
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Old 12 July 2013, 12:33   #7
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Fault with the neutral position switch in the throttle?
Engine speed is limited in neutral.
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Old 12 July 2013, 14:53   #8
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Could be crud blocking the pickup in the fuel tank. Are you running portable or under deck tanks?
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Old 12 July 2013, 15:18   #9
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Fault with the neutral position switch in the throttle?
Engine speed is limited in neutral.
Throttle sensor? We had similar, intermittent problem of only getting to low ish revs
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Old 12 July 2013, 16:29   #10
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Throttle sensor? We had similar, intermittent problem of only getting to low ish revs
Good shout. That's a possible one, had a fault on that before.
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