I removed all 4 spark plugs on the wife's Fiat Punto 1242cc 8valve 1999 60s Mk1 single point injection.
All 3 had right colour. 1 plug (on number 3 cylinder I think) was black and sooty buy dry, as if too rich mixture. - anyone know what this denotes and what to look for and can it be an extensive and expensive problem with the engine?
The engine is idling a bit lumpy (like its only running on 3 cylinders instead of 4) but when going at speeds of 40,50,60mph is as smooth as anything and not misfiring or any thing.
Any ideas please?
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