Ferrari Mailing List: Re: 328 fast idle question--hit a bump?

[Jeff Greenfield (coyote]

This was a US only thing. Euro cars were more simple.

There is a sensor on the coolant tank of the (US) injected QV's and  
328's. It's been awhile but as I recall, the switch opens when the  
temperature rises. When cold, the switch is closed and energizes a  
vacuum switch which is partially responsible for raising the idle speed.

There is also an oil temperature switch which works in a similar  
fashion and when it closes tells the system to go into closed loop mode.

The other part of the fast idle puzzle is the AAV (aux. air valve),  
it's possible that this failed or more likely, you have a disconnected  
or cracked air hose.

Jeff

Sent from my iPhone

On Sep 26, 2008, at 10:17 AM, "Rui Gigante" <rui.gigante [at] gmail.com>  
wrote:

> If it is a 328 the temperature sensor is not on the recovery tank,  
> at least
> not on my 328 (European).
>
> Check the thermo time switch (and connection) below the intake  
> plenum on the
> left side and also check the connections to the WUR (warm up  
> regulator) and
> to the additional air valve below the recovery tank
>
>
> Rui
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