Rough running

[jimbo]

Ok so I changed the plugs and leads on the S1, cause I got water into one of the spark plug chambers and it dropped that cylinder.

It's running now - but really roughly. It sounds and feels lumpy and the pops and bangs from the back sound like artillery fire. I can't take it above about 3000rpm or the emissions warning light comes on, and if I rev it past that it just drops a cylinder. So I then have to stop, turn it off, wait a few seconds and start it again, at which point the cylinder is back??

What's going on?

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[Dave]

In the old days I would disconnect the plug leads one at a time until I got to the one that made no change in the way the engine was running, this would tell me which cylinder I was having a problem with, then take it from there. You did connect the leads to the correct cylinder/plugs when you replaced them?

[philthy]

^ turn the engine off to do this, you can get quite a jolt from the leads when it's running

Were the spark plugs gapped when you fitted them? Check all the leads are in the right order and seated properly

[jimbo]

Will check all of this and report back, fairly sure I put them all in correctly but doesn't hurt to check.

Cheers

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