1996 SL1 knock sensor - Saturn Forum - Saturn Enthusiasts Forums
Old 10-07-2008, 12:47 AM
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Join Date: Oct 2008
Location: United States
Posts: 3

HI, does anyone know how or have ever replaced the knock sensor on this 1.9L I was told that it was on the block by the firewall on the drivers side. I can''t seem to see it but i do see a wire running to where i think it is. anyone know the easy way other than paying someone to do it to remove and replace this?
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Old 10-07-2008, 08:40 AM
Join Date: Jul 2008
Location: Riveria of America
Posts: 2,748

The knock sensor is a single-wire sensor located in the engine block directly behind the oil filter. With the ignition key on and the engine not running, backprobe the connection checking for voltage. It should read between 1.5 and 5.0 volts. If the voltage is higher or lower, then the sensor is either open or shorted, and should be replaced.

You can test the operation of the sensor by hooking up a timing light and observing the timing marks on the crankshaft pulley. Have an assistant sharply tap the backside of the air intake plenum with a hammer. The ignition timing should momentarily retard a few degrees. If it does, the system is working properly. If the harness test was good but the marks don''t move, the sensor is probably faulty.

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Old 10-07-2008, 01:35 PM
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Join Date: Dec 2006
Location: United States
Posts: 1,367

Originally Posted by joshhamann2008
I was told that it was on the block by the firewall on the drivers side.
You were told wrong

A picture is worth a thousand words.

Click the image to open in full size.

1991 Turbo SL2
11.809 @ 116.488 mph

1995 2.0L Saturn SL2m
1993 SW2 - SOHC to DOHC swap
2001 Chevrolet Suburban LS
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Old 10-07-2008, 04:27 PM
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Join Date: Oct 2008
Location: United States
Posts: 3

Ok thank you, that diagram doesnt match the 1.9 motor tho does it, the drawing part looks nothing like the actual part...

http://www.partsamerica.com/ProductD...?MfrCode=BOR&a mp;MfrPartNumber=S8634&PartType=412&PTSet=A

whats the easiest way to get that off then?

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