Misfire and plugs?

[feef]

2002 MX5 1800, supercharged

The car has been running fine until earlier this week where it developed a misfire

I checked the plugs and found that the plug in cylinder 3 had had the electrode bent to the point that it was touching the center electrode, but there wasn't any obvious signs of contact

I re-gapped the plug and refitted it (as it was sunday evening and everywhere was shut) and went for a run, and all seemed fine

Today, I swapped out the plugs with some new ones and did an oil and filter change while I was at it

Went out for a short blast and noticed some hesitancy at the top end under load, and on returning home, the misfire had returned, however, it was the plug in cylinder 1 that had suffered the bent electrode now, number 3 looks tickety boo

Cambelt was changed less than 10k miles ago
both coil packs were replaced last year (2 packs for 4 plugs, wasted spark)
Both misfires developed after a blast with high rpms

Any ideas?

[feef]

ill be inspecting the combustion chamber with a borescope tomorrow. It seems ofd that it's now a different cylinder. However, I'd expect such failures to continue in their respective cylinders and also, perhaps, have a much more catastrophic effect on performance than I've noticed.

I'll take a look tomorrow and see what's what.

[feef]

Let's play Spot the Difference

[feef]

I've decided to drop in a 4.0l 1UZ engine instead

[feef]

http://www.pistonheads.com/gassing/topic.asp?h=0&a...

And I'll be updating http://kickingtyres.co.uk with posts too