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Join Date: Mar 2010
Location: sydney
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newbie question . for sc idle rpm
hi guys , i just got my sc week ago . i just change oil , now when the car is cold start the idle rpm about 2000 then warm up, the idle rpm drop and stay on 1200 - 1300 is that normal ? or too high ?what is the normal rpm for sc thanx
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01-28-2012, 05:08 PM
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ROW '78 911 Targa
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800 to 850 rpm is normal when warm.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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01-28-2012, 05:11 PM
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hi timmy , do u know what can i do to make the rpm drop to 800 . thanx
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01-28-2012, 05:13 PM
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Join Date: Apr 2010
Location: New Orleans, LA
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turn the idle speed adjust screw with a flattip screwdriver. look for the big slotted screw where the throttle is on top of the engine driver side.
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1982 911SC, Mocal oil cooler, Bilsteins, Carrera tensioners, backdated heat, factory short shift, Seine gate shift, turbo tie rods, pop off. 2005 Mercedes-Benz C230 kompressor sport 6-speed (daily driver) |
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01-28-2012, 05:50 PM
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thanx schumlcat . and also like to ask where is the mix adjustment i could find it , can any one show with the picture thank you so much
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01-28-2012, 05:57 PM
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Location: Ontario Canada
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It is right on the top of the air mix assembly next to the fuel distributor . There is sometimes a rubber plug in there.
Ypu will have a far bigger efect on idel with mixture than idle control. If you can get your hands on a LM1 or other gas analyzer I would set your base CO adjustment , then adjust idle.
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1976 Yamaha XS360 ( Beats Walkin') 1978 911 SC Targa ( Yamaha Support Vehicle ) 2006 Audi A4 2.0T (Porsche Support Vehicle ) 2014 Audi A4 2.0T Technik (Audi Support Vehicle) |
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01-28-2012, 06:04 PM
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i will give try , thanx
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01-28-2012, 06:50 PM
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i just try to tune the idle adjustment and mix adjustment , even worst now , the idle rpm going up and down then the car shut down . what can i do now , should i take to the shop to fix it ? is that will be very expensive ?
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01-28-2012, 09:25 PM
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ROW '78 911 Targa
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CIS Primer for the Porsche 911
You should read this and understand the content before adjusting anything on your CIS. You probably only needed to turn in the idle air adjust screw a little to drop the rpms. Try to remember what you did and do the opposite to get it running again. High idle is better than no idle.... When adjusting air and fuel mixtures a little is a lot! Turn idle screw in 1/4 of a turn, rev motor for a bit, release and see where idle settles down. Slowly repeat until you find it. You really don't want to mess with the richness adjustment too much ever. Once you know what you are looking at read this thread if you don't want to take it for tuning with an analyzer. How to setup CIS with no gauges
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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01-28-2012, 10:25 PM
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ROW '78 911 Targa
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You didn't happen to overfill the oil did you? If oil made it into your CIS system your idle will change.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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01-28-2012, 10:28 PM
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no i dont think i overfill the oil
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01-29-2012, 01:34 AM
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just randomly adjusting the air fuel mix was not a good idea. it is usually done by someone with a tester that lets you know when the mixture is right.
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1982 911SC, Mocal oil cooler, Bilsteins, Carrera tensioners, backdated heat, factory short shift, Seine gate shift, turbo tie rods, pop off. 2005 Mercedes-Benz C230 kompressor sport 6-speed (daily driver) |
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01-29-2012, 05:13 AM
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my car now when warm at around 900 now ,is that ok ?
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01-30-2012, 04:18 PM
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ROW '78 911 Targa
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Yes
__________________
Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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01-30-2012, 04:57 PM
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Heinz
