No, Mr. Lemmywinks, No!!!
Join Date: Jun 2005
Location: Harriman, TN
I would test all the injectors with a "noid light".
I bought a set years ago; Advanced will loan a set, iirc.
Of course, holding the throttle open for a full minute, with it running very rich, would do the same thing.
I missed this part:
"held at WOT (about 3750 rpm is all I could get) for about a minute,"
I wouldn't do that; it won't help.
Cats will definitely need replacing; I'd recommend the "Rebar treatment" until you find out why it's dumping fuel.
No need to replace them and kill new ones.
Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.
"War Is Peace. Freedom Is Slavery. Ignorance Is Strength." - George Orwell.
Truth Isn't Truth. - Rudy Giuliani, 2018 Award winner, “Most Outrageous Diversion” by MSNBC for this quote