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Cedric
Joined: 27 Aug 2004
Posts: 2833
Location: Sweden
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 Posted: Wed Oct 29, 2008 6:22 am Post subject: How should the s2 throttle switch work ? |
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Hello!
My idling suddenly got a bit high. I could adjust it down with the air screw. But still rough idling and it doesnt adjust itself. So i took out the switch. What readings and when am i supposed to get when i measure it. If iīm right we measured and it worked as it should before this happened. But this was some time ago. As it is now it switches at more than half throttle, isnt it suppose to do that after just 1 degree or something like that. I think we got 0.6ohm after that. Can the problem be related to the switch being contaminated by oil that has worked itself down the shaft after some earlier smokingproblems ?
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1980 924 Turbo
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Maybe924
Joined: 14 Aug 2007
Posts: 412
Location: New London, CT
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| Posted: Wed Oct 29, 2008 7:16 am Post subject: |
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A malfunctioning Aux Air Valve could cause this also.
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1981 931 GT (CGT Intercooled)
1985 911 Targa Carrera (Sold) |
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gegge
Joined: 27 Jul 2007
Posts: 1124
Location: Sweden
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| Posted: Thu Oct 30, 2008 7:56 pm Post subject: |
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Isnīt the throttle switch just on/off? Then the throttle is closed the switch tells the DITC to control idle by adjusting the timing of the ingition.
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Carl Fredrik Torkildsen
924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs |
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Cedric
Joined: 27 Aug 2004
Posts: 2833
Location: Sweden
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| Posted: Fri Oct 31, 2008 4:47 am Post subject: |
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Yes, i know how the system works. But I cant remembre what the ohm reading should be when the witch is open. I remember that i read it here some time ago but i cant find it any more..
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1980 924 Turbo
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Cedric
Joined: 27 Aug 2004
Posts: 2833
Location: Sweden
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| Posted: Sun Nov 02, 2008 7:19 pm Post subject: |
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After cleaning it with all sorts of chemicals it now seems to work after we opened it up. A thing I noticed is that the switch includes a switch at almost full throttle that the ditc never use. Intressting...
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1980 924 Turbo
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morghen
Joined: 21 Jan 2005
Posts: 9102
Location: Romania
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| Posted: Sun Nov 02, 2008 7:34 pm Post subject: |
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yea..it has two swithces but it only uses one to find out if its idling or not.
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Supercharger and EFI kits
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Mon Nov 03, 2008 5:25 am Post subject: |
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S2 switch has three outputs, one for idle, one for WOT, and one for partial load.
Terminals and functions are discussed by Keno and others HERE.
When installed, the idle switch should go OFF at one degree of throttle rotation, approximately .2 to .5 mm gap at the throttle stop. Rotate the assembly until this spec is achieved.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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morghen
Joined: 21 Jan 2005
Posts: 9102
Location: Romania
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| Posted: Mon Nov 03, 2008 5:42 am Post subject: |
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yea...3 terminals but only two wires going to the DITC
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924 FAQ (Technical)
