[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Testing Knock Sensors

This method has been mentioned before, although I haven't used it or
advocate it myself.

Take a long bar that can reach the block around cylinder #1 on the sensor
side. Should be made from steel. Tap the free end lightly with a hammer
and see the voltmeter connected to the plug fluctuate. I'm sorry that I
don't have specifics.

My experience is that some of these sensors aren't really bad; the threads
aren't making metal to metal contact and/or the torque spec isn't proper
after all those years and miles. Try this: remove the sensor in part or
whole, retorque. Spin it back and forth in the hole to "chase" the
threads. Retorque. Believe it or not, reusing a sensor, it actually needed
more torque (I did it in stages even though it was very low), maybe 5-10
pounds more to eliminate the error code. Works like a charm. Try it, you
don't have much to lose if it works.

*Steve                                             Sachelle Babbar
*'87  5000CS Turbo 5spd 1.3-2.0 bar             <SBABBAR@IRIS.NYIT.EDU>
*Cockpit adjustable wastegate, AudiSport badge
*Disclaimer:"Any information contained herein is based purely on my own
*personal experience and may not necessarily reflect yours. Use caution as
*your results may vary from mine."

On Thu, 2 Dec 1999 ozitzmann@atmi.com wrote:

> Is there any way to test a knock sensor?  I have a 2144 fault code, but I want
> to confirm that the sensor is bad before I replace it (expensive).
> Thanks,
> oz
> '90 200Q Avant