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Member 911 Anonymous
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84-89 Size of Idle Adjustment Screw Oring
Hey Fellas,
Last couple of days my idle dropped and stayed around 700 RPMs at stops. I found the O2 Sensor had disconnected, bad crimp, so I reconnected it but the idle was still not where it should be. Which is odd because I have not messed with it since my last AFR Adjust and Base Setting. So next step: I tested my base idle, jumpered at B&C and for some crazy reason the Base Idle dropped to 700 RPMs  . WTF???I prompty raised the RPM's to 880 RPMs but it was being inconsistent when I blip the idle. Sometimes it would go to 920RPMs then I adjust to 880RPMs, Blip then it changes again to 800RPM's. Then it dawned on me, the Idle Adjustment Screw was Hissing. POSSIBLE VACUMM LEAK? I always thought this was normal. Then just to test it, I jiggled the screw around and hissing got bad to worse. Question: do we know the size of the Oring OD/ID? A thread stated 1/4" Diameter but not specific if it was ID or OD. TIA 
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-14-2009, 07:03 PM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
Posts: 3,059
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dude, you are the Idle King. I need to PM you for some idle adjusting Face Time.
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended.  Deny Everything; Admit Nothing; and Always Make Counter-accusations 
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04-14-2009, 07:33 PM
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Member 911 Anonymous
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Ah Man, I don't want to be, I just want to drive her, dang it!
So do you know the size of the Oring?
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-14-2009, 07:49 PM
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Member 911 Anonymous
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Well, just got back from Pboys, well they got a Metric Oring Set but here is the problem:
8MM ID/12MM OD or 10MM ID/14MM OD The OEM part appears to be 9MM ID/13MM OD I used the 10/14, a tight (too tight) fit and the hissing subsided. Crap, it looks like I am calling Wayne. WIIT, might as well get a cap
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-14-2009, 09:31 PM
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muck-raker
Join Date: Jan 2009
Location: Coastal PNW
Posts: 3,059
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wish I could help you, dude. Seriously, I've wanted to get in there to check out my air/fuel mixture. I've followed some of your ventures into this, because I know relatively little about it. So don't be surprised if you get a PM from me about this in the near future.
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STONE '88 Cabriolet, using EP Slick 20w50 partial synthetic Snake Oil...just as Rommel intended. Deny Everything; Admit Nothing; and Always Make Counter-accusations
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04-15-2009, 07:12 AM
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Member 911 Anonymous
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Hey No Problem Brother. PM me anytime. If I can help I will.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-15-2009, 09:25 AM
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Schleprock
Join Date: Sep 2000
Location: Frankfort IL USA
Posts: 16,639
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Kevin L '86 Carrera "Larry" |
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04-15-2009, 09:26 AM
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Member 911 Anonymous
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Thanks, I ordered a new Screw and Cap
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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04-15-2009, 09:50 AM
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Registered
Join Date: Nov 2002
Location: Canada
Posts: 716
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Hi Draco,
I just replaced my idle screw and it still hisses, so I am assuming this is normal. Did you fix this with a new screw?
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1975 Widebody 911 3.2 Euro |
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08-06-2009, 07:07 PM
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Member 911 Anonymous
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Yeap, new one hisses too but did fit tighter.
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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08-06-2009, 08:25 PM
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Marble Grey
