SHELBY GT 350 Member
Joined: Sep 2010
Location: see user name
As mentioned in several of my past rantings and also in the comments above, don't bother with those plugs. No "+5hp", no "increased mpg" per the advertising propaganda to be found there. A spark is a spark, period. The rest is all ********.
If you want a real man's plug (no homo), Autolite 764 (or equivelant) is where it's at. Contradictory to what is spec'd in repair manuals and elsewhere, set the gap to around .045"-.048"-ish.
How do you plan to "check" the injectors? Be careful removing and reinstalling them, there is a little o-ring where they seat into the fuel rail that is very fragile. A typical recommendation would be to have a new set of o-rings onhand and replace the existing ones prior to reinstallation.
If I were you though, instead of messing with the injectors I would think about replacing the fuel filter if it's been a while or possibly never.
2001 GT Convertible
All the usual bolt-on's /200 I6, C4
And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4