SC idle problem
 

I can set my engine to give a smooth idle at standstill, but when coming to a halt (at a junction, for instance) after a run the engine just dies and will not idle.

Any suggestions as to what could be wrong?

Cheers

It maybe could be your fuel accumulator,and, on SC's the fuel/air mix is very tricky, I have my 83SC set by my mechanic using a exhaust gas analizer.

Did you set your idle speed when the engine is good and warm?

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Bill Krause
'79 911SC Euro

Yes, and the engine idles happily when warm at standstill, but not after it's been revving.

It could be your deceleration valve. If it's not working right, it can cause the WUR to over lean the mixture when you are at high RPM and no throttle (decelerating). I'm not sure how to test it though. Does your engine start right back up after it stalls?

It might be the centrifical advance system in your distributor is sticky. Have you oiled it lately?



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Bill Krause
'79 911SC Euro

Yes, engine restarts fine. I'll look at the distributor, thanks.

Distributor advance moves smoothly.

If you clamp off the vacuum line that goes to the bottom of the Warm Up regulator, that will prevent the vacuum on the intake side of the throttle body from leaning the mixture. It will also cause the mixture to run rich. Try doing this just to see if the reason the car is stalling is because it's getting too lean when decelerating.



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Bill Krause
'79 911SC Euro