Engine - Knock Sensor Fix

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Date: Sun, 21 Jun 1998 23:34:18 -0700
From: Jim Brink 
Subject: Re: Knock Sensor fix

Tony Bartlett wrote:
> 
> Well everyone,  It looks like I might have fixed my Knock Sensor code on
> my 85 22RE engine.
> 
> I have had this code for a few years now but never really worried about
> it because I never had a drivability problem.  I previously checked to
> make sure the connectors and wires where in good shape.  I never wanted
> to spend the money for a sensor unless I knew for sure that was the
> problem.
> 
> So, I borrowed one from a friends engine he had in his garage.  I went
> to remove my sensor and it was loose.  Well, I figured if it was loose
> it would be rattling more than normal possibly giving false information
> to the computer.  I removed the sensor to verify if it was working like
> the one I borrowed.
> 
> I hooked up an a/c voltmeter to the single pin connector and to the
> outside case of the sensor.  Give it a good tap and watch the voltage.
> It would very from .1 volts to 1.5 volts depending on how hard it was
> tapped.  Seems to be working.  Tightended the sensor down properly and I
> have not had the check engine light come on since.  It has only been a
> couple of days but my light would go off just about every time I would
> drive the truck.
> 
> So if anyone else out there is having a knock sensor code you might want
> to make sure it is screwed on tight.


Good advice Tony. Another way to check the knock sensor is with a timing
light. Give the block a few raps with a hammer with the engine speed at
anywhere above about 1,500 RPM. You should see the timing retard
accordingly.

- -- 

Jim Brink     Toyota/ASE Certified Technician     toytech@off-road.com
Manhattan Beach, CA                  http://www.off-road.com/~toytech/
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			1986 Toyota Standard Bed 4WD
	 22R - 32x11.50/15 BFG M/T - 4.88s- Downey LSD - EZ Locker
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