GEN 2 Misfire Code? SPD may have found a simple fix.

[smgilles]

Brand new user here and owner of a used '17 Raptor as of about a month ago (all stock- no tunes or upgrades). I have the same rough acceleration and intermittent rough idle pnwRaptor mentioned. I just replaced plugs with SP578 gapped to .028 and cleaned all my MAP sensors. That helped a bunch but it still happens randomly. It feels just like a misfire, but no CEL and no misfires detected in the stored/Mode 6 data either. You guys think going to 542's would clean it up?

I'm also in the mountains, so 91 octane is the highest octane I can find.

same exact issue I had with my 2017 before going to colder plugs. They no longer make sp542s. A simple search on this site will give you the new #.

 

[Meferrell84]

same exact issue I had with my 2017 before going to colder plugs. They no longer make sp542s. A simple search on this site will give you the new #.

Thanks!