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Old 30 July 2005, 14:26   #1
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Merc 90 fourstroke stutter and stall

Yesterday when having just started my voyage, the outboard was stuttering almost like it was missing when I throttled up (only when accelarating), at low revs. Seemed to clear at 2000 rpm and lasted for about 20 mins. When doing some low speed (tickover) manuvering in the harbour every so often the outboard would stall. And finally everytime I tried to plant the trottle from tickover to full throttle the engine coughed and splutterd and died.

What's up Doc?
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Old 30 July 2005, 14:36   #2
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Sad to hear this Andy, I do not have solution to the problem but if I can help get in touch

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Old 30 July 2005, 14:43   #3
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Thanks Bogi! Engines always started fine and performs very well. Had a frozen throttle linkage a month ago and copias amounts of maintenance spray with PFTE on the carb butterfly linkage points and turning the flats off the cam roller have sorted that. I have noticed the stuttering on the last couple of trips, but the stalling.....I've never had that one before. Just trying to understand the problem.
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Old 30 July 2005, 15:01   #4
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Andy,

Had a similar problem with my newish engine last week. It was dirty carbs. So they said. It was under warranty so I didn't play with it.

Best of luck.
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Old 30 July 2005, 15:09   #5
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Andy

I have had this on cars before and it ususally turns out to be lack of fuel or air.
Duff electrics tend to either go or no-go.
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Old 30 July 2005, 15:16   #6
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Lack of fuel....Goes like the clappers still

Lack of air....Checked that

On the fuel side of things, I was thinking in the way of an accelerator pump or something. Or perhaps a mixture problem, but none of that has changed.
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Old 30 July 2005, 16:40   #7
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Is it an EFI model or a Carb?
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Old 30 July 2005, 16:44   #8
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I still go for fuel starvation.

Something loose in the tank, collapsing fuel line, dodgey fuel filter or manifold air leak. Summut like that.

Should have stuck to a 2 stroke.
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Old 30 July 2005, 16:46   #9
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Turbo

I think it is a carb one. He has told me, but ............
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Old 30 July 2005, 16:59   #10
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HT, my new tow goes like stink, then it starts to splutter, give the fuel bulb a pump & all sorted! guess air is getting in, have not had a look to sort it out yet! Dose it sound similar?
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