Today I went out the the wifes Fiat punto MK1 1242cc 8valve 1999 to have a look as to why it is idling roughly/chuggy. Whilst the engine was Idling with a pair of pliers I took off spark plug number 3 lead and the idling actually got smoother rather than rougher! - very strange it seems to be working back to front! - Does anyone know why its more chuggy when I put spark plug lead back onto cylinder number 3?
A few weeks back I pulled out spark plug 3 and it was jet black tip whereas all the other plugs were correct colour (gray/brown)
So it seems like the engine is idling better with spark plug lead on cylinder number 3 removed (but then as you rev it up it goes lumpy because its only running on 3 cylinders instead of 4) Any Ideas anyone please?
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