2003-04 Mach 1 Registry Owners Club - View Single Post - Thread for those of us who tune our own cars

Mach828 · 04-23-2015, 07:24 PM

Changed the IAC to a fresh OEM ford unit and no change. Has to be something with the tune. If I unplug the IAC while its doing it, the car dies. So its flowing too much air through it. I smoke tested it and couldn't find any vacuum leaks.

MAF readings are really steady, so I don't think its that because air fuel is dead on. I did just learn that you have to change all of the voltage comp and pressure adjustment tables in the fuel injector data. Noticed my timing is jumping up to 30 when it idles like that, so I'm capping low load and low rpm timing to 5.

Woooahhh! Capping the timing under 1.5k and .2 load fixed the issue. I also played with some of the dashpot and ISC functions to get it to drop to idle like a rock.

04-23-2015, 07:24 PM	#151
Mach828 Dark Knight Join Date: Nov 2009 Location: Albuquerque, NM Posts: 5,759	Re: Thread for those of us who tune our own cars Changed the IAC to a fresh OEM ford unit and no change. Has to be something with the tune. If I unplug the IAC while its doing it, the car dies. So its flowing too much air through it. I smoke tested it and couldn't find any vacuum leaks. MAF readings are really steady, so I don't think its that because air fuel is dead on. I did just learn that you have to change all of the voltage comp and pressure adjustment tables in the fuel injector data. Noticed my timing is jumping up to 30 when it idles like that, so I'm capping low load and low rpm timing to 5. Woooahhh! Capping the timing under 1.5k and .2 load fixed the issue. I also played with some of the dashpot and ISC functions to get it to drop to idle like a rock. __________________ Vortech V2 S-trim, E85, A2A Treadstone, Comp cams, built engine, full exhaust, built rear, built 4r70, more mods. Tuned by me with SCT Advantage Last edited by Mach828; 04-23-2015 at 08:07 PM.