How do you adjust the microswitch on idle?
03-03-2003 | 07:35 PM
#1
Thread Starter
Instructor
Joined: Jun 2001
Posts: 148
Likes: 0
From: Newport Beach, CA
How do you adjust the microswitch on idle?
I have a 93 3.6 w/Patrick Motor Sports lightened flywheel and Centex chip to compensate. Although the car does not die when taking my foot off the gas do to the lightened flywheel is does dip down in the RPMS a little. I've heard you can adjust the microswitch to compensate for this. Does anyone have a pic or diagram of where the adjustment is made? The factory manual is a little vague.
03-04-2003 | 01:25 AM
#2
Race Car
Joined: Jun 2001
Posts: 3,706
Likes: 9
From: Virginia Beach, Va.
Are you sure you're not referring to the ISV?? (Idle Stabilization Valve) 
This will raise the idle up a bit, and possibly cure your RPM "dip" under decel.
Search the 993 boards for "ISV Adjustment" - there's a comprehensible procedure listed on there.
This will raise the idle up a bit, and possibly cure your RPM "dip" under decel.
Search the 993 boards for "ISV Adjustment" - there's a comprehensible procedure listed on there.
03-04-2003 | 01:59 PM
#3
Addict
Lead Rennlist
Technical Advisor
Rennlist
Lifetime Member
Lead Rennlist
Technical Advisor
Rennlist
Lifetime Member
Joined: May 2001
Posts: 8,027
Likes: 16
From: Parafield Gardens
I concur here with Jeff. Unless you install some aftermarket type of adjustable control valve the idle cannot be adjusted. All the idle microswitch does is tell the DME that you have requested idle or your foot is off the gas pedal. It plays no role in the value of idle rpm which is fixed at 880 plus or minus 40.
Ciao,
Adrian
911C4
Ciao,
Adrian
911C4
