No, Mr. Lemmywinks, No!!!
Join Date: Jun 2005
Location: Harriman, TN
That's the air in the inlet resonating, from the IAC.
Usually it means there's a Vacuum leak, and the IAC is bouncing off one end of travel, instead of being in the middle of the swing.
The fuel vapor canister circuit is where most unfindable leaks are; there are what, 7 sections of tubing less than 4" long?
One is in the passenger fenderwell; that's the hard to find one, lol.
It's worse when it's cold and dry; there's more 02 in the leak, and the IAC is trying to shut off.
The Cigar Test (search) is the best way to find all the leaks; at least someone you know smokes.
You can even get one of the really annoying anti-smoking people to help you find the small leaks after you fix the big ones, lol.
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.
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