on your marks, get set....misfire !!!!

[Tony Tone]

Bugger. I had a misfire on the cylinder to the back, Left hand side. Changed, plugs, leads, rotor arm and dizzy cap and b'jingos....it's still there... does this mean its valves ?

[kevtherev]

could be a brake servo hose air leak
Is the mixture OK?
might be time for a compression test

Cylinder No 3?

[Tony Tone]

Yes, It's No 3. it was running fine for ages and the misfire started before I changed the ignition electrics and air filter. Changing all the various stuff didn't cure it as I'd hoped. If it was mixture would it just appear on one cylinder ?, wouldn't it effect all of them ?

[kevtherev]

it would appear first on any cylinder with lower compression than the others

[kevtherev]

other things to try...

timing correct?
plug gap OK?
crankcase ventilation hose secure?

does it misfire throughout the driving range?

[jason k]

any popping?

[john1]

Don't rule out having put a duff new plug in there!

I did just that, whats the chance, 4 new plugs and i put a duff 1 in number 3 where i had the missfire!
After spending more dosh on other items and finding lots of new words, i changed the plug again and bingo!
Shop gave me a full set of plugs to say sorry,,,he needed 2 for his ears!

[kevtherev]

Valid point...
well put

[Tony Tone]

lol, a good point, ill try swapping them around and see what happens. Just took it for a drive and it wasn't happy, backfiring etc. Aaaaand my coolant light is constantly flashing when I turn the ignition on, whats that all about ?, I have lots of coolant in there !!!!!!

[jason k]

ahh sounds like an induction leak. check gaskets(spray with wd40 when motor running and listen for note change) and vacc connections