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2007 FX4 with 5.4 3valve, 62,xxx miles, Driving over mountain 2 days ago, low engine speed, truck in OD, light grade, felt a couple misses … no codes, no more misses either. Was a very warm day but truck was only running about 195.
Ordered 8 SP546 plugs but recalled that I ordered and received 8 SP515s last summer, so cancelled the SP546s. I'g like to go with SP546s but SP515s are in it now (OEM) so I guess these will be ok for a few years. I thought they would work in our '08 Mustang, but it'd a 4.6 and calls for SP509 or equivilant.
Have Lisle tool & the nickel anti seaze already. She's also due for oil/filter change so guess I'll do it all.
The SP-515 have been superseded by the SP-546 by Ford. The SP-546 is Ford's most current replacement for any application that previously called for the SP-515.
I've never had a plug (SP515) break since this exercise (which I do now at every plug change). My truck is north of 235k miles and it will usually get up to 50 - sometimes 80 drive cycles without OBDII registering a single misfire.
Save some money maybe. The coat hanger wire I made to finish mine up the first time - would probably work just fine by itself with a few extra swabings with B-12 Chemtool.
It has the advantages of not getting carbon dust (and potentially brush bristles) into the cylinder - OR the brush coming off the handle and falling inside.
Which ever technique you use, I am absolutely convinced this is a primary source of the misfire problems with this engine. --- good luck.
Last edited by F150Torqued; 07-14-2018 at 10:13 AM.
07-04-2018, 05:27 PM
