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Old 05 July 2012, 10:20   #1
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Optimax throttle problem

I was out yesterday on the west coast of Ireland. Engine 2001 200hp optimax) ran perfectly all day until 300m from home the throttle became unresponsive (was at WOT) and had to kill it by turning the ignition off.
My first thoughts were the throttle cable had snapped. Eventually managed to get the throttle into neutral and tried to start it. It turned over but took a fair few turns To start and when it Did the revs shot up yo about 4000 and not in gear.
Its the finale of the volvo ocean race here so no shortage of fellow ribbers about and Got towed in by another Rib, first time having to be towed and was quite embarrassed.

Had a quick look under the cowl at the slip and couldn't see a problem with the throttle cable linkages etc and they seemed to be moving ok when going forward and reverse??

Going down to it this evening with my toolbox so just wanted to see if anyone might have a possible diagnosis I haven't come with yet??
Throttle position sensor??
Top mount control box??
Worn/snapped cable ??
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Old 05 July 2012, 13:00   #2
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Throttle position sensor?

Have you got a manual?
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Old 05 July 2012, 14:47   #3
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Yes have the workshop manual.
What symptoms would a bad throttle position sensor throw out??
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Old 06 July 2012, 11:12   #4
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Quote:
Originally Posted by Waterman
Yes have the workshop manual.
What symptoms would a bad throttle position sensor throw out??
Can't say for sure but mine was knackered and the revs were all over the place and it wouldn't idle.
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Old 08 July 2012, 12:55   #5
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What did you find then?
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Old 27 July 2012, 08:42   #6
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Only got around to looking at this last night.
Turns out the cable end on the throttle lever had come undone!!

Reconnected it and it is off by a few cm on the engine end now. Went through the steps described in the service manual to set it back up but cable seems like it is too long/stretched now??
Does this make sense to anyone??
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Old 27 July 2012, 10:19   #7
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Quote:
Originally Posted by Waterman
Only got around to looking at this last night.
Turns out the cable end on the throttle lever had come undone!!

Reconnected it and it is off by a few cm on the engine end now. Went through the steps described in the service manual to set it back up but cable seems like it is too long/stretched now??
Does this make sense to anyone??
Has it come out of the grip on the cowl or control?
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Old 27 July 2012, 12:28   #8
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Throttle cable/ controller

Quote:
Originally Posted by Jizm View Post
Has it come out of the grip on the cowl or control?
or possibly the cable is connected to the upper hole in the arm (this will reduce the throw) or that the retaining pin is not fitted correctly and is 'swinging' ( no RibNet comments here pls )
Been here myself

Couple of piccies to help - though I may be completely off track

Jeff
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Old 30 July 2012, 15:39   #9
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Thanks for the help lads.

Turns out the cable mounting (not the cable end) on the throttle body had come loose and slipped forward making the cable appear to long!!
Brought a friend down to have a look and he spotted it straight away. One of those things where a second set of eyes was the only way it could have been solved. I could have looked at it for a month and not thought of it!
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Old 30 July 2012, 17:16   #10
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Glad you sorted it.
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