Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance Ruining platinum plugs with gap gauge?

Originally posted by JonnySVT:

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Otherwise you gap EVERY plug and YES no matter even if they say they are pre-gapped.

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Amen! My APPs that were supposedly pre-gapped, were all off.

You mentioned you had Ford Racing wires....and you are having a rough idle problem....not making assumptions, but check the wires.

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Mine were all off, too. Probably almost .01 between the most and least gap out of the box. And yes, I do have (and prefer) the wire feeler gauge.
I actually mentioned that I had Motorcraft (not Ford Racing) wires. They might be the same wires in a different box for all I know, but they are grey and 8mm. I will still check them, or I might just throw some Motorcraft plugs in it, see what happens.