Bad Knock Sensor - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-25-2007, 01:45 PM   #1
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Default Bad Knock Sensor

Well, I just had my car scanned today (for free, lol) and it came up with a code 42, which was linked to a bad knock sensor. How hard are these to replace?
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Old 01-25-2007, 02:03 PM   #2
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Um? no.

I have that as well and its caused because of the KR I get. Yours could be a bad knock sensor though, depending on the circumstances....Its a PITA to get to last time I checked on my 93.


Mine happens (code) on a mountain pass when I'm running sustained 20* of KR all the way up and WOT.
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Old 01-25-2007, 02:03 PM   #3
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I can't remember if you have a front and back or just one.

Pretty easy if you can get to them. If you have two, they are dead center of the block. Right below cylinders 3 and 4, with a nice little shield and connector.

I think I have a pic.. BRB
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Old 01-25-2007, 02:03 PM   #4
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Kinda hard to reach, easy to replace once you get there. Coolant will come out though.
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Old 01-25-2007, 02:05 PM   #5
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Here'* one. Little white part of the connector showing behind the AC bracket.

And the other with the wire hooked up under the exhaust
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Thinking more..I think in 92 there was only one at one end of the engine.
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Old 01-25-2007, 02:06 PM   #6
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It'* on the back close-ish to the oil pressure sender.
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Old 01-25-2007, 02:06 PM   #7
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I need to drain my coolant anyways; stupid air pockets
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Old 01-25-2007, 02:10 PM   #8
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In the red circle.

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Old 01-25-2007, 02:20 PM   #9
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so you can get to it from the left side of the engine?
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Old 01-25-2007, 02:34 PM   #10
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Probably similar to the oil pressure sender..where it'* easiest in your year to remove the wheel and wheel well splash guards.
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