Idle surging up and down

[scirocco_88_16v@hotmail.com (Brian Wagner)]

Dan the 8v don't have the idle switch that is 16v specific, everything else 
is sound though. Also disconnect the O2 sensor and see if the vehicle goes 
into limp home mode (IDLE SMOOTH OUT AND SMELL RICH).

HTH
Brian


>From: "Dan" <dan.czech@verizon.net>
>Reply-To: <danws69@earthlink.net>
>To: "'Andy Morris'" <jeepvolks@alaweb.com>, "'Volkswagen'" 
><scirocco-l@scirocco.org>
>Subject: RE: Idle surging up and down
>Date: Wed, 27 Mar 2002 13:43:42 -0500
>
>I had the EXACT same problem and symptoms with my 16v recently.....
>
>
>here's what I did:
>a) take off the air boot from he air cleaner to the intake....clean
>thoroughly
>b) clean the TB thoroughly
>c) take the idle screw all the way out and clean that opening thoroughly
>d) check to make sure that the throttle-thingie (can't remember what it is
>actually called) is contacting and engaging the idle switch
>e) when you put the idle screw back in, make sure the rubber o-ring isn't
>shot, if it is, use something (I used that black silicone stuff) and then
>screw it back in....NOT TOO FAR THOUGH! Start the car, the idle should be
>REALLY high, that's a good thing, start screwing the idle screw into the TB
>until it reaches ~1100rpm
>
>Have fun!
>
>Dan
>Tam-pa, FL
>'87 16v Scirocco
>'81 Rabbit Sportruck
>'00 Jetta
>http://home.earthlink.net/~danws69/index.html
>-----Original Message-----
>From: scirocco-l-admin@scirocco.org 
>[mailto:scirocco-l-admin@scirocco.org]On
>Behalf Of Andy Morris
>Sent: Wednesday, March 27, 2002 13:28
>To: Volkswagen
>Subject: Idle surging up and down
>
>
>I have an 85 Scirocco 8v with 296,000 miles on it.  Yesterday it started
>idling kind of low so I suspected a vacuum leak right off the bat.  I used
>an entire can of carb cleaner looking for the problem and could not come up
>with anything.  Now the engine is going from "almost stall" to 1100 rps - 
>up
>and down.  It sounds like the vacuum booster is saving it, at the last
>second, from cutting off completely (I can hear it click just before it
>dies).  The car idles perfect if I turn the A/C on and the compressor is
>running; like the A/C vacuum booster is keeping it idle.  I know it is not
>the boosters because I swapped it out from my parts car just to check.  Any
>ideas?
>
>Thanks!
>Andy Morris
>jeepvolks@alaweb.com
>
>
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