Originally Posted By: tommygunn
I know you're not supposed to do it on a hot engine, but how long does the car need to sit before replacing the spark plugs? An hour? 2 hours?
If it makes any difference, it's a 2008 Civic LX R18
How many miles? The iridiums don't need changing until 120k.
I changed my brothers 06 civic plugs for the first time at 160k, they looked comparable to new, the electrode was the same length...no mpg or power increase after changing.