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
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?