Got slight mis fire
Discussion
Have noticed slight misfire above 4,000 rpm with full throttle. I suppose that I will start replacing rotor arm, dis cap, plugs and leads in that order. The only other thing is I filled it up with Morrison's petrol and washed it so could be a bit of water in some where or it has got a dis like of the petrol. Everything else is normal. Could do without anymore car trouble this week, Shogun gearbox failed on Monday.
Before buying any new parts go through the ignition system checking for moisture. 9 times out of 10, this is what causes a misfire, and seeing as you've just washed it....
As mentioned, the plug wells are the most likely candidates. Take the plug cover off, and pull out the ignition leads. Curl up some kitchen roll and push it down each plug well and leave it for a little while to soak up any water. If any bits are particularly wet, stick another down until its dry. Spray some contact cleaner (or WD40) into the ends of the plug leads and reattach them.
Next, pull the dizzy cap off and dry any moisture out from there. A hair drier or heat gun would do the trick. Some contact cleaner in there wouldn't do any harm either. Reattach. I'd pull the plug ends off at the dizzy as well and spray the ends of them. Look for any other connectors that could have got wet and clean them.
Hopefully that'll cure it. But to stop this happening again, I'd seal up the dizzy with some silicon or some tape. Also run a bead of sealant along the uphill edge of the spark plug cover to stop water getting in there again. I tend to waft some wet start/sealent around as well to protect electrical connections. Good luck with it.
As mentioned, the plug wells are the most likely candidates. Take the plug cover off, and pull out the ignition leads. Curl up some kitchen roll and push it down each plug well and leave it for a little while to soak up any water. If any bits are particularly wet, stick another down until its dry. Spray some contact cleaner (or WD40) into the ends of the plug leads and reattach them.
Next, pull the dizzy cap off and dry any moisture out from there. A hair drier or heat gun would do the trick. Some contact cleaner in there wouldn't do any harm either. Reattach. I'd pull the plug ends off at the dizzy as well and spray the ends of them. Look for any other connectors that could have got wet and clean them.
Hopefully that'll cure it. But to stop this happening again, I'd seal up the dizzy with some silicon or some tape. Also run a bead of sealant along the uphill edge of the spark plug cover to stop water getting in there again. I tend to waft some wet start/sealent around as well to protect electrical connections. Good luck with it.
Been having a right nightmare. There was a bit of water down the one plug, but there was also some bits of plastic. I only found this out when the plug spanner would not fit on. Been fiddling about with thin bits of wire and a little torch for ages. I think it must be the remains of an old plug cap. Could get them to move but not get them out. Had visions of taking the head off to give it a good shake. In the end I cut a small piece of hose pipe, taped it on to the vac and sucked it out. Was a little bit of moisture in the dis cap, will leave it of tonight and put it back together tomorrow night. Hope this sorts it out. Plugs look like new, I think Paul Matty must have changed them when I bought it. Only done about 2k since.
insy09 said:
i had a mis-fire which lead to flashing management light. I ended taking it to the garage and had to have a new CAT fitted and o2 sensor (i think).
If it is flashing my advice is dont drive it and take it to the garage.
Only S1 111s's have MIL and even that was a retrofit.If it is flashing my advice is dont drive it and take it to the garage.
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