[200q20v] Out of service for the winter....

[Bernie Benz]

I don't agree with this diagnosis.  IMO, the A/C magnetic clutch
(dis)engagement (not power, but voltage) spike does not and can not cause
wide RPM changes.  Radio interferance and other momentary bad stuff, yes,
maybe.  The cause is the failed open circuit condition of a supression diode
in the AC clutch relay, which can be easily replaced with a $0.10 diode from
RC.

Bernie

> From: Kneale Brownson <knotnook at traverse.com>
> Date: Tue, 09 Oct 2001 21:23:59 -0400
> To: Gronberg <fussball_200 at yahoo.com>, Bernie Benz <b.m.benz at prodigy.net>,
> 20020v List <200q20v at audifans.com>
> Subject: Re: [200q20v] Out of service for the winter....
> 
> Classic description of the A/C magnetic clutch engagement power spike that
> jolts the ECU.  Audi fixes this with a replacement relay and a resister
> inserted into the wiring to the A/C clutch.  The problem and fix are
> described on Scott Mockry's great
> website   http://www.sjmautotechnik.com/     under  "click or pop" in the
> electrical section of the troubleshooting tips menu.  Took care of that
> problem in my 200q20vt.
> 
> 
> At 05:47 PM 10/09/2001 -0700, Gronberg wrote:
> 
>> When I turn on the Climate COntrol to anything other than "econ" I get a
>> drop in
>> RPM, and the an unstable idle (+/-  250-300 RPM) and, while accelerating I
>> will get
>> an intermittant hit that fuels like a fuel cut out (the car bucks, hard)
>> 
>> John
>> 
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