Hi all,
The next exciting installment in the saga that is my Fiesta 1.25Zetec-S (1998)...
I managed to have a spark plug actually pop out of the cylinder head yesterday. It appeared intact and went back in quite happily but it did smash itself and the HT lead through the plastic cover on the top of the engine! It looked an awful mess but was actually fine again once the plug was put back.
The question is: Do plugs do this sometimes? Is it common on Zetecs? It appears to have just unscrewed itself as there was no thread damage either on the plug or the cylinder head. I've never actually had the plugs out of this car as I've only had it a few months. Could I really have been driving for several thousand miles with a plug that was about to pop out?
On Friday I did spill a bit of oil while topping up the engine, which I guess must have got to the spark plug threads but I'm still amazed that it managed to cleanly unscrew itself!
Tony