spark plugs

[sbiggi]

when the spark plugs are rust colored...is that bad, what does it mean???:(
They are bosch platinum right now, gapped @.025, we had ngk's one heat range colder but they were to cold and didnt burn off carbon.....

thanks

edited for sp

[hoffman]

you should go back to the 7ESs. platinum plugs foul in our cars, hence the reason everyone preaches the BPR plugs.

yes, rust color is bad.

[V8SpankR]

Brownish to grayish tan is what plugs should look like. If they are rust/orangish then that's called high speed glazing which is caused by a sudden rise in temps in the cylinder under hard acceleration. This generally means you need to switch to a colder plug (+1 heat range) and tune your car as it could be a lean condition that is glazing the plugs.