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-   -   CIS frequency valve question (http://forums.pelicanparts.com/porsche-911-technical-forum/8501-cis-frequency-valve-question.html)

lagoon 09-24-2001 12:46 PM
CIS frequency valve question
 
Is the frequency valve supposed to turn on (start to humm) as soon as the ignition or fuel pump is turned on? I am getting about a 10 second delay. Is this normal? I have a new o2 relay. 81'SC

john walker's workshop 09-24-2001 01:23 PM
i don't remember any delay, but as long as it buzzes when the engine's running, all is well.


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