Ok, lessons learnt today. You can pull a spark lead off the plug and not get a boot as long as you don’t touch any other part of the car.
Result is number 4 playing up. Suspected stuck inlet valve.
Rocker cover off revealed number 4 inlet valve floating about all over the place.
It had derailed from whatever was down near the cam. Now know it’s called a camm follower.
Checked the rod and it’s not bent.
Valve not stuck. Gave it a few good whacks to prove its was ok and yes I ensured piston was at Bdc.
Refitted push rod, re gapped and gave it a go.
Purring like one of our 4 pussy cats.
Why it derailed I have no idea. Anything else I need to look out for?
Cheers
Max
