Date:         Sat, 22 Sep 2001 12:30:59 -0500
Reply-To:     John Rodgers <jhrodgers@CHARTER.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John Rodgers <jhrodgers@CHARTER.NET>
Subject:      Re: Do I really need the Idle Stabilizer Valve?
Comments: To: Don & Christina Preston <betsy@UTAH-INTER.NET>
Content-Type: text/plain; charset=us-ascii

> Don & Christina Preston wrote:
>
>> So, to my question. This bus originally had A/C and Power Steering. I've
>> pulled both of these (replaced PS with a manual rack). Since the ISV is used
>>
>> in conjunction with the A/C and PS, do I really need to have it installed?
>

The ISV is just that, and idle stabilizer. The other aspect is mixture control.
On a cold start on a cold day ISV will stabilize the engine rpm  until the
engine is warm, then mixture  gradually leans out to it's set points and the isv
is removed from the ECU circuit.  Without the ISV the ECU will probably run your
engine to the rich side and eventually soot up and kill your catalytic
converter, which if I understand correctly will make your vehicle run rich.

John Rodgers
88 GL Driver