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Old 01 September 2007, 17:16   #1
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,539
Suzuki "huff codes"

Well, today started well, having proved the months of tweaking & adjusting carbs, the engine now runs sweet at idle, and will accelerate nicely to a smooth purring WOT..... For about 25 seconds worth, then it all went pear shaped. Today's potentially best cruise of the season was utterly knackered about a minute in. I fear ECU huffing may be the problem.

I've checked Clymer's wonderful publication, and the "default symptom" in the chapter on the control system seems to be "alarm will sound, and engine will rev. limit to 3000rpm". Well, one out of two ain't bad, and it mentions nothing about the apparent warning cough it gives. We tried numerous times with varying states of engine warmth - i.e as WOT as we could get it, and also after a good 10 mins switched off & drifting - same symptoms every time - to the second.

Without fail - open throttle from idle- takes off wonderfully, no hesitation etc, and tramps off on the plane. Exactly 25 seconds later it would hesitate momentarily, then power on as if nothing had happened until the 50th second after WOT, when a quite spectacular display of rev. limiting took place. This was tried & tried and the times stated held solidly every time.

So, I think it stinks of the ECU dropping into some form of protection mode, but not once did I hear the buzzer. (tested that by shorting the low oil contacts & deafend myself, so the buzzer works!). So, I now have to wonder, does my ECU have a different set of fault protection symptoms as Clymer's apparent default settings suggest?

Anyone out here got a Manual that contains Suz DT25/30 info for the 1993 vintage motor and might give a better description of fault warnings / actions?

My previous mechanical fiddling makes me think it is likely to be either overspeed, over temp or "TPS on the wonk" related, however any help enlightening these symptoms so I can figure out what the bundle of elecronics thinks is wrong would be appreciated.

Right now I feel the only appropriate action will involve a bottle of cider!
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