[200q20v] Knock Sensor & Oil Cooler Info

Kneale Brownson knotnook at traverse.com
Mon May 7 12:45:54 EDT 2001

Did you determine the amount of airflow reduction resulting from the 
screen?  I think I read somewhere that ordinary doorscreen  material will 
reduce airflow in this sort of application by nearly half.

At 08:09 AM 05/07/2001 -0800, Bernie Benz wrote:

>Jeff,  You'll also find in like manner that your intercooler and aux
>radiator are partially plugged with dirt and sand.  After cleaning, I use
>plastic screen cloth, for screen doors, as a pre filter to keep the sand
> > From: Jeff.Bernstein at pneumaticscale.com
> > Date: Mon, 7 May 2001 06:30:48 -0500
> > To: 200q20v at audifans.com
> > Subject: [200q20v] Knock Sensor & Oil Cooler Info
> >
> > I had noticed that over the last few months I wasn't getting as much boost
> > and the boost was coming on slower.  I finally saw a code referring to the
> > #1 knock sensor.  I  looked at the sensor and found that all the outer
> > plastic cable shielding was cracked and was disintegrating quickly.  I
> > replaced both knock sensors since the #2 sensor was starting to 
> disintegrate
> > also.  I now have full boost and it comes on faster also.
> >
> > As I was working on the car I also noticed a large leaf was blocking 
> part of
> > the oil cooler.  I decided that in order to get the leaf out I had to 
> remove
> > the ducting in front of the oil cooler.  Upon removal it became obvious 
> that
> > the cooler was almost completely clogged with dirt that had slowly
> > accumulated over the years.  I could hardly see any light though the cooler
> > and the dirt was baked on especially the bottom half of the cooler.  I
> > disconnected the cooler from the frame and lowered it into a bucket of
> > water, leaving the lines attached, and soaked it for 24 hours.  I then used
> > an air compressor to blow the small gravel and sand out of the cooler which
> > took almost an hour of work to get the majority of the dirt out of it.  I
> > had noticed that it seemed like the oil temperature was hotter than it used
> > to be but it was going up over the years at a very slow rate due to the
> > gradual build-up of dirt.
> >
> > I took the car out for a test drive after fixing all these things and was
> > pleasantly surprised to find that the oil temperature was noticeably cooler
> > even though I was making a lot more boost.  I would suggest that anyone 
> with
> > a high mileage car should take some time to check these two items.  Very
> > rewarding weekend project.
> >
> > You can see my car at a web sight that my son made for our various Audi 
> cars
> > at http://www.bernsteincars.8m.com/.
> >
> > Jeff Bernstein
> >
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