Originally Posted by Torchred2010gt
Mine does the same thing.depending how long/or many times i let my needles do its sweep turn it on and it has like a second delay or something.most of the time it starts up but just those times it's like it struggles to turn over.already had a maf replaced.dont know what it is
The "needles" should not sweep, you have a blown fuse--probably fuse 21 (5A) in the central junction box,--or possibly or a wiring problem. Fuse 21 supplies constant battery power to the instrument cluster and PCM, to keep their volatile RAM powered up. If it is blown both the cluster and PCM KAM (Keep Alive Memory) will be cleared and reset when the key is turned on.
The cluster will sweep the gauges to determine there full range, the PCM will have to relearn idle air trims, startup AFR, long term fuel trims and a bunch of other adaptively
I have read of people removing fuse 21 to make the gauges sweep, "just like a Honda"--why anyone would want to make their Mustang behave like a Honda is something I cannot fathom?
- 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.
New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq