1990 90 20V q Knock Sensor

[Dave K.]

There are two knock sensors.  One is toward in the front of the engine,
around the thermostat housing if I remember right.  The other one is about
mid-engine.

If your wires were short you probably have a #2 sensor in the #1 (front)
position.  They will work in either position, just the wiring is a different
length for each one.

I always but #1 sensors because the wire is longer and it will go in either
position.

Your codes should have told you which knock sensor was acting up.

I know they are PIA to change.  I always take off a bracket or two to get to
the sensor.

Your original problem does not sound like the ks problems I have had.  Mine
would not pull while accelerating.  I would lift of the gas a little and the
timing would advance again and the car would pull again.  If you gave it
more throttle the timing would retard again.

I'd say check your codes again.

Dave K.
3rd 20v, replaced knock sensors in them all...



----- Original Message -----
From: "Iain Atkinson" <iain.atkinson at tesco.net>
To: "Dave K." <desmo888 at comcast.net>; <quattro at audifans.com>
Sent: Saturday, December 28, 2002 11:01 AM
Subject: RE: 1990 90 20V q Knock Sensor


> As far as i can tell it only retarded the timing when the car was doing
say
> 80 mph and on a trailing throttle it has a hesitancy about it above 4k rpm
> it's fine pulls all the way to the red line, i have now put the old one
back
> in and it seems fine apart from the original problem. Oh and what a pain
it
> is to get at it my hands are now all nicely chewed up even wearing plastic
> gloves.
>
> Looking at the wiring digrams for the car it appears to have 2 knock
> sensors, one that is actually screwed into the block with a thread on the
> sensor itself, the other one i can't find right now it must be buried by
> other stuff that i am loathe to remove today as i need the car tomorrow.
>
> Thanks
>
> Iain
>
> -----Original Message-----
> From: Dave K. [mailto:desmo888 at comcast.net]
> Sent: 28 December 2002 15:28
> To: Iain Atkinson; quattro at audifans.com
> Subject: Re: 1990 90 20V q Knock Sensor
>
>
> Did it only retard the timing occasionally before?  May be that your new
> sensor is bad.
>
> Dave K.
> '90 CQ
>
> ----- Original Message -----
> From: "Iain Atkinson" <iain.atkinson at tesco.net>
> To: <quattro at audifans.com>
> Sent: Saturday, December 28, 2002 6:42 AM
> Subject: 1990 90 20V q Knock Sensor
>
>
> > Hi folks
> >
> > just replaced the knock sensor on my car this morning, now it runs
really
> > flat all hesitant and couldn't pull the skin off a rice pudding. Any
> advice
> > what to do next??? Do i need to get the fault memory erased?? previously
> it
> > was showing a "sporadic knock sensor fault" which is why i replaced it.
> >
> > The only other thing to say is that the wiring was too short to attach
> > underneath the plug on the bulkhead so i have now cable tied it securely
> out
> > of harms way. The part is the correct one as i have double checked it on
> the
> > family album.
> >
> >
> > TIA
> >
> >
> > Iain
> > ---
> > Outgoing mail is certified Virus Free.
> > Checked by AVG anti-virus system (http://www.grisoft.com).
> > Version: 6.0.422 / Virus Database: 237 - Release Date: 20/11/02
> >
>
>
> ---
> Incoming mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.422 / Virus Database: 237 - Release Date: 20/11/02
>
> ---
> Outgoing mail is certified Virus Free.
> Checked by AVG anti-virus system (http://www.grisoft.com).
> Version: 6.0.422 / Virus Database: 237 - Release Date: 20/11/02
>