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Message started by marekbuk on 09/04/15 at 08:36:32

Title: Misfiring
Post by marekbuk on 09/04/15 at 08:36:32

Hi all

My 2005 S40 has started misfiring intermittently on acceleration - at all revs and speeds. Sometimes it runs fine for a couple of minutes and then will miss-fire and stutter! I've got an in-line fuel filter fitted so doubt the carb is clogged and suspect something electrical but where to look?

anyone had similar symptoms?

cheers

Mark(UK)

Title: Re: Misfiring
Post by verslagen1 on 09/04/15 at 08:42:04

I'd replace the plug and check the plug wire.
in the end of the plug is a screw fitting make sure it's tight.

Title: Re: Misfiring
Post by justin_o_guy2 on 09/04/15 at 10:01:09

And make sure that there is no sand waiting to fall in when the plug come out.
Now is a good time to mod the right side head cover trim, so the tank can stay on.

Title: Re: Misfiring
Post by thumperclone on 09/04/15 at 11:04:30

an under voltage battery can cause sputtering also

Title: Re: Misfiring
Post by thumperclone on 09/04/15 at 11:04:48

an under voltage battery can cause sputtering also

Title: Re: Misfiring
Post by marekbuk on 09/04/15 at 13:41:23

Thanks guys - will check battery voltage first, then replace plug/check lead and do the cover mod as its a pig to remove my tank and seat as I've done the Bluecollar bobbers conversion - will let you know how I get on tomorrow

Title: Re: Misfiring
Post by Kris01 on 09/04/15 at 17:53:04

Many folks have reported problems with using an inline fuel filter. Could be the culprit. Try running without the filter and see if that cures the problem.

Title: Re: Misfiring
Post by marekbuk on 09/05/15 at 11:04:24

OK so this morning I removed the Spark plug and it was sooty as hell - so down to the auto store and replaced it and did the LH head cover mod at the same time (used an angle grinder to cut a slot in the cover and replaced the bolt with a stud!)
Whilst removing my bobber seat I could see the probable cause for running so rich in that my not-so-neat rewiring and positioning of the starter solenoid meant that there was a fair bit of obstruction over the stock air intake. I'd have thought that air would have found its way around the wiring but perhaps not?
I did check the filter element and it was clean but gave it a blast of air anyway.
Anyway she runs like a dream now - I also pulled out the brass blanking plug in the carb body whilst I was at it.

Happy riding and thanks for the advice guys.