Misfire after heavy rain?

phil675

phil675

phil675

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So it rained quite a lot yesterday and this morning the car was quite lumpy and slower than usual. I'm thinking it might be a the coil pack, I don't really want to change spark plugs on a V6 as it's quite fiddly.

Is there a way to diagnose things like this? I've got a code reader but haven't had a chance to stick it on yet. Do you think this might have been caused by the extreme wetness?
 
Do this with Vaseline or Vaseline alternative?

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phil675 said:
So it rained quite a lot yesterday and this morning the car was quite lumpy and slower than usual. I'm thinking it might be a the coil pack, I don't really want to change spark plugs on a V6 as it's quite fiddly.

Is there a way to diagnose things like this? I've got a code reader but haven't had a chance to stick it on yet. Do you think this might have been caused by the extreme wetness?
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I had the exact same problem last week with my ST220 driving to work in heavy rain and going through large puddles etc. it started juddering in every gear and driving sluggish. Thought it was gonna cut out at one point.
Got the spark plugs changed and it's been fine since
 
It seems a lot better now, no misfire but still quite groggy at low revs, so I'll see how it goes. Spark plugs are £30 but the coil pack is £120 new.. £40 second hand but that might still be a duffer.

Hopefully it'll just go away :D
 
I don't know what car you have but as you suggested i would say coils, leads plugs. worth plugging it in and seeing if anything is logged on it's ECU.
 
Have you looked under the coilpack? (assuming its ontop of the plugs) I developed a misfire on my old 406 v6 and it turned out the rocker cover was leaking a little oil and there was a swimming pool there which sloshed about under acceleration.
 
breadturbo said:
Have you looked under the coilpack? (assuming its ontop of the plugs) I developed a misfire on my old 406 v6 and it turned out the rocker cover was leaking a little oil and there was a swimming pool there which sloshed about under acceleration.
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Could also be water in the spark plug wells as modern cars they are so deep water doesn't evaporate for a long time.
 
So I used the bluetooth reader to find a misfire in cylinder 1. Took the lead off the plug after much fiddling and blew it like a SNES cartridge, much smoother now and no misfiring, still need to fix the dreaded moose sound though :D
 
Finglonga said:
Could also be water in the spark plug wells as modern cars they are so deep water doesn't evaporate for a long time.
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This!

Very common on Fords!

(They seem incapable of manufacturing water proof bonnets!)

(Also have a tendency to develop leaks from corroded core plugs in plug well on cylinder head)
 
Plugs cables coils. That is what i would change and it will be sorted 95% czance :)
 
Had this exact same problem with not driving my clio from friday night - monday morning.

Started up fine , but emissions light came out and it sounded like it was going to cut out when in stationary traffic. Have had the same problem before, it's either water getting into the spark plug bores, or water where the ht leads plug into the coil pack, wd40 solved the issue short term for me!

It'll eventually evaporate, but a misfiring cylinder , ie unburnt fuel or partially burnt is bad for the catalytic converter btw.
 
This happened to me a long time ago; water in the distributor cap. I used some WD40 to clear it out and it ran fine after that.
 
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