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PCA Member since 1988
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It's likely that you or someone else had increased the mixture to compensate for the vacuum leak. After you eliminated that leak, you needed to lean the mixture proportionately. You ain't the first.
Remember to check the vacuum advance is working correctly, and vacuum retard at idle, if you have it. I disconnected the retard side on my 1980 SC dizzy. Full advance with the vacuum lines disconnected should be about 28-30 degrees, at 3500RPM and higher. I push the mechanical advance a bit more, as it gives better torque and throttle reponse.
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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06-02-2024, 02:30 PM
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Registered
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Congrats @kltarga
Agree with PeteKz. Additionally I would check how many turns you need to close the idle screw (remember old setting). The basic setting is 2 turns. So fully close it CW and open it by 2 turns CCW. With this setting and a CIS in shape and correct ignition timing a CIS car should idle around 800-1000rpm. If not, there's still one or more other issues. Also I want to point you on checking the sensor plate height and the injection start (starting the fuel pump when slightly lifting the sensor plate). This hangs closely together with the idle setting and the overall CIS and mixture control. https://forums.pelicanparts.com/porsche-911-technical-forum/1108835-cis-sensor-plate-height-2.html#post12201501 Thomas
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1981 911 SC Coupé, platinum met. (former tin (zinc) metallic), Bilstein shocks, 915/61,930/16,WebCam20/21, Dansk 92.502SD,123ignition distributor with Permatune box as amplifier,Seine Systems Gate Shift Kit,Momo Prototipo. Want to get in touch with former owners of the car. Last registration in US was in 2013 in Lincolnshire/lL. |
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06-03-2024, 03:24 AM
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Lash
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Yes, vacuum advance is working as PeteKz described.
I will check the idle adjustment to see if it operates as Schulisco suggested. Also thanks for the link.
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Lash 1963 356 T-6 Normal Coupe 1972 911 T Coupe ..... Sold 1972 911 S Targa ...... Sold 1980 911 SC Coupe Weissach |
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06-03-2024, 10:34 AM
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Porsche 911 SC
