[200q20v] Knock Sensor & Oil Cooler Info

Bernie Benz b.m.benz at prodigy.net
Mon May 7 09:09:09 EDT 2001

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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