2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Throttle % on startup question.

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Old Aug 6, 2007 | 09:07 PM
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Throttle % on startup question.

I have noticed that my SAFC II reads about 5% throttle on cold startup, and then it gradually lowers down to reading 0% after a little while. I haven't noticed this when it's already warm though. I always start it in gear so its not the AWS. This affects my idle and I was wondering if it should be doing this.

I also have noticed that my idle will fluctuate sometimes when I have the clutch pedal pushed in (depressed). Any ideas on either of these subjects would be great. Mods are in the sig.
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Old Aug 6, 2007 | 10:21 PM
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I believe it's part of the cold or assisted start-up process. I have an s4 non-turbo, and it acts the same way. Only mod is a catback exhaust and no catalytics.
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Old Aug 7, 2007 | 05:50 AM
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Originally Posted by RED1990GTU
I have noticed that my SAFC II reads about 5% throttle on cold startup, and then it gradually lowers down to reading 0% after a little while.
That's the thermowax opening the throttle a bit to give a good cold idle. It's perfectly normal and is the way it's supposed to work.
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