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Old 18 August 2003, 06:22   #1
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Engine "sneeze"

Hi,
I experience problems with my Johnson V6 175 hp. It's running bad to dead in low revs and idling. It's supposed to be water in the gas but I've drained the carburators and several times emtied the petrol filter. The engine continues to "sneeze" at low revs and finally die.

Any mechanic out there who could give me a good advice I'd be grateful.

Many thanks


/Matt -Sweden
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Old 18 August 2003, 06:30   #2
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I've just been to my machanic's after this started since they put in new plugs. And they told me exactly the same. Dirty fuel, water in fuel. Check the plug cap's etc. But it has only been since they put the new plugs in. And 'sneezing' would describe it perfectly. So any help will be gratefully accepted.

Lee
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Old 18 August 2003, 07:31   #3
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Take two ColdCaps, go to bed with some tissues and have a rest - Muahaha
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Old 18 August 2003, 08:12   #4
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Used to have a Yamaha that did this once in a while, at tickover. Turned out to be a slightly bent read valve that occasionally didn't seat properly and allowed the fuel air mix back out. The reeds on a carb engine are behind the carbs which can normally be removed in one. The reeds look like petals and are very thin strips of metal. Could be that a bit of dirt or gum/varnish from old petrol as stuck one open slightly. If you don't want to take the carbs off, try a can of Quicksilver carb cleaner in the engine whilst its running, might solve the trick, either way its a DIY job before you have to start paying a mechanic.

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Old 18 August 2003, 15:31   #5
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It's no good draining the carbs if there is still water in the tank - you'll just collect more water in the carbs - you should be able to see if there is water in there when you strip them.

Also get yourself a water seperating filter, that way it will limit your chances of the problem recurring (remember to drain off any water reguarly!) - assuming that's what it was to start with!
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Old 19 August 2003, 02:48   #6
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Snezze

I know, the problem is that I have a water separating filter and I empty this often. I'm starting to think the water get's in after the filter? Again assuming water is the prblem.

/Matt
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Old 19 August 2003, 11:52   #7
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Weak idling mixture can give this effect. It normally stops on the 'sneeze'.
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Old 19 August 2003, 15:32   #8
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Right I am hoping someone can help please.

Attached is a picture of my fuel filter, sorry about the quality but the pics where taken with my mobile which was all i had on me when I just went down to check the boat.

The top picture shows the underside of the filter. There is this twist in plug. When under slightly undone it lets the contents of the bottom of the filter drain out.

Now should with this model I drain out the bottom area which is liquid. Or do i replace the whole unit??

Thank You
Lee
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Old 19 August 2003, 22:49   #9
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I had this problem on my engine. I renewed the fuel and filters but that made no difference. I referred to the manual which stated the pilot screw base settings on the carbs and set them as specified. Problem cured, seems to start more easily and rev more cleanly aswell.
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Old 20 August 2003, 03:22   #10
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Lee that looks like a standard diesel filter. No problem there, as they are finer filters than petrol engines and despite the manufacturers saying you shouldn't, I have used them with petrol engines for years.

The cartridges are about £3 from an accessory shop. The 296 is the finest and 522 slightly courser but both will work fine and at that price not worth messing about with. Buy two and carry the spare on board.

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