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Still thinking about why my car isn't running well, with the flat spot etc. (see other threads by me)

I have used the spark plugs from the original motor I replaced, which was cooked. They are the iridium (spelling?) type plugs and have very thin electrodes.

Could these be damaged / US from the old engine being cooked?

I should probably buy new ones anyway, but thought I'd ask the question.

Thanks.

could be very possible.....if they are exposed to very high heat its not good...as in cooking a motor...i was with someone once who really cooked there turbo motor to the point you could feel the heat about 20 feet away and them plugs were toast

I cooked a Mazda 1300 years ago to the point that there were bubbles and melted substance coming from the head gasket, lots of sizzling noises and melted electrical wires - I had a couple of spares, so I wasn't too concerned at the time - hence why I drove it until it stopped - locked solid!

thats tends to stop them...lol

Don't think irridium (sp?) plugs would get hurt by a little bit of a cooked motor though?

How's the engine block earth?

Iridiums are very good plugs and can withstand alot of abuse before having any issues. I took some from a turbo Liberty today that didnt have the tip on them anymore and the engine was running fne like that. I wouldnt think it would be plugs try the ignition lead however as they start to fail it is usually a miss higher in the rev range gradually limiting the rev limit.

worth trying anyway. Mazda 1300's ! I've owned ten of them. buy,fix,sell,buy,fix, sell....then I moved up to my Brumby

the plugs could be an interesting colour though !!