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Where is the idle adjustment screw?
I did some searching here, but didn't find the answer. When I bought the car, the timing was set at 15 deg BTDC. I've since put the timing closer to where it belongs, 24 deg. BTDC. And now it idles high. My car is an '87, if that matters. Thanks
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'87 930..Sold  '72 911T 3.2 MFI Twin Plug race motor, full cage, full coilovers, too many suspension mods to list, wide body, Fiske wheels, R888, fuel cell, fiberglass everything, 2091lbs  "You don't have to be CRAZY to own a sports car, but it helps" Last edited by 1SIK930; 03-02-2011 at 10:35 PM.. |
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03-02-2011, 10:30 PM
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Turbofrog
Join Date: Aug 2009
Location: Europe
Posts: 1,677
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At the trottle body on teh left side under/behind the IC. It's a big srew that you dial from the left side
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03-02-2011, 10:35 PM
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Tinkering Pays!!
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You may have to tighten it 'all the way' to get the idle you want... make sure you're adjusting it when the car is fully warmed up...
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR. |
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03-03-2011, 06:12 AM
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Banned
Join Date: Nov 2007
Location: Rockwall, Texas
Posts: 8,559
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03-03-2011, 09:40 AM
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Registered
Join Date: Jul 2008
Location: Central Washington State
Posts: 4,434
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Quote:
 I don't think you can get anywhere near that at idle even if you wanted to (mine's at 12 btdc @ idle...intentionally) and I had to elongate the groove in the distrubutor to allow it to rotate far enough for that level of timing. Prior to adjusting the idle, it's advised to do at least 15 minutes of stretching exercises so as to limber up the arm that has to contort back behind and inbetween stuff in order to reach the screw (that's if you don't have a really long screwdriver). What I eventually did last time I had the engine out was to connect a long shaft directly to the adjustment screw; said shaft now sticks out to the left of the IC and I can easily turn and adjust the idle in about 2 seconds.
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Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, B&B intercooler, stock 3LDZ. |
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03-03-2011, 04:40 PM
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Registered
Join Date: Jul 2006
Location: S. Florida
Posts: 7,249
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i took the idle speed screw out and brazed a washer into the slot. then sanded it and painted it black.
with the longneck garretson and the deceleration valve vented to atmosphere in that area the washer makes reaching the idle bypass screw easier. |
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03-03-2011, 06:12 PM
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Registered User
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Yeah, that's at 4000 rpm with the boost and vac lines undone and plugged. I found the idle screw and got the idle down to around 900 rpm, instead of the 1100 it was idling at. Thanks everyone
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'87 930..Sold '72 911T 3.2 MFI Twin Plug race motor, full cage, full coilovers, too many suspension mods to list, wide body, Fiske wheels, R888, fuel cell, fiberglass everything, 2091lbs "You don't have to be CRAZY to own a sports car, but it helps" |
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03-03-2011, 07:50 PM
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1SIK930 Sold
White Lightning
Teeter Totter
Porsche 930
Ford Truck
