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.

Originally posted by DemonSVT:

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Feeler gauges are the only thing you should use.

Those POS gapper disc are garbage! They are not worth the metal they are stamped from.


The only thing I could possibly state to the contrary is plugs like the POS Bosch +2 or +4 style.

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

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Agreed. I used to have a couple of old RX-7s, and the NGK plugs I put in those didn't look as if they could be gapped. Very strange looking plugs. Other than that, I've always gapped my plugs.

Edit: just found a picture of them. The second one from the right looks like what I put in my '85 with the 12A 1.1L carb'd rotary. link The ones that went in the '87 looked like one of those 3 prong deals to the left of that. They were extremely weird, due to the fact that there is a leading plug and a trailing plug, I believe because the combustion chamber is so wide. (Why do I feel like I just hijacked my own thread?)