With all of this talk about spark plugs, I decided to check with our local Ford parts dealer. Here in Canada, it lists an AWSF32FS for 96 and newer Duratecs and an AWSF32PP for 95 Duratecs. The only listing they showed for a AWSF22FS was for 4.6l Crown Victorias et al. The other funny part is the 32FS plugs are about 1/4 the cost of the 32PP plugs. Aside from the issue of heat range, is this another decontenting of Ford's parts by using the cheaper plugs in newer vehicles or is it just the wrong listing in the Ford parts system here in Canada?
Needless to say, we purchased the Motorcraft double plats for testing in the SVT. Last note, the previous Bosch +4 plugs, which were in for some 35000kms, showed no signs of unusual wear or collapsing. In fact the gap, compared to a brand new set we have to compare, is still about the same on all of the plugs and between all of the electrodes. We pulled the +4's out of curiousity due to some owners noting that their +4 plugs had collapsed ground electrodes. I'm happy to say again, we did not experience this problem.
