Hard start, cold start problem, rough idle...now Idle Switch/MAF Code

Michael Hopton Michael at siliconoptix.com
Thu Jul 6 15:13:49 EDT 2006


I have a spare (nearly new) that you can try?

You are talking about the one on the throttle butterfly?

cheers, Mike

-----Original Message-----
From: 200q20v-bounces at audifans.com [mailto:200q20v-bounces at audifans.com]
On Behalf Of Derek Pulvino
Sent: Thursday, July 06, 2006 1:06 PM
To: 200q20v at audifans.com
Subject: Re: Hard start, cold start problem,rough idle...now Idle
Switch/MAF Code

Isn't the speed sensor one that will also throw a fault code if it goes
  When people have had them fail, has that happened...ie get a speed
sensor fault when that's attributed to running problems in the car?

Just got a quote from SJM for the idle switch...only available through
Audi for the ever so reasonable sum of just under $400.

Anybody have an extra speed sensor they want to loan out for the sake of

Derek P

Message: 2
Date: Mon, 03 Jul 2006 13:34:42 -0400
From: Kneale Brownson <kneale at coslink.net>
Subject: Re: Hard start, cold start problem,rough idle...now Idle
	Switch/MAF code
To: "Kenneth Keith" <auditude at gmail.com>,200q20v at audifans.com
Message-ID: <4.1.20060703132350.01155998 at pop.powerc.net>
Content-Type: text/plain; charset="us-ascii"

The 5k and 200 sensors are the same and cost around $100 new.  The V8
has two such sensors, same as the other two except for the color of the
insulation on the wiring (one's gray and the other's black), and the
length of the wires.  The V8 sensor price is in the $150 range and the
one with black insulation supposedly is no longer available.  I bought
two for our
V8 #1 a couple years ago and put black tape on one to make
at the wiring connector easier.   I just got a new 5K/200 version for
on our V8 #2, which has developed the non-restart when hot symptoms.
The gray wire is three times as long, but I have enough black tape to
make it look black, and I bet I can find a way to take up the slack.

At 09:22 AM 7/3/2006 -0700, Kenneth Keith wrote:
>Kneale Brownson <kneale at coslink.net> wrote:
>>Just for curiosity's sake:
>>On the V8, the engine speed sensor has a history of failing with age.

>>It sits under the driver side exhaust manifold, supposedly protected 
>>by a heat shield.  When it starts to fail, the car will not restart 
>>when hot.  Will start cold and run OK cold/hot, but shut it off and 
>>try to restart a few minutes later and there is no go.  I'm guessing 
>>the ECU needs signal from the sensor to let the ignition spark.
>>Has anyone ever found an engine speed sensor go bad on an I-5 engine?
>>Could that device cause poor idling on an I-5, but not necessarily no 
>Yes, my buddy's '89 200q10v had an RPM switch go bad, which would make 
>the car die when hot.  We put another used one in and it is okay now.
>I had never heard of that failing until this incident, but another 
>person pointed us in that direction claiming it's a common failure.
>Upon describing the symptoms, he went straight to that diagnosis.
>It's simple enough to check if you have another sensor to try.

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