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Single Wire Knock Sensor

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Can a faulty single wire knock sensor be bypassed by simply grounding the harness lead or does a resistor need to be tied in? If resistance is needed, what is the correct size (i.e. one mega ohm, etc)? Mine crapped in my '87 GL turbo wagon. NAPA tells me its a dealer item only and I'm not even going to sicken myself by calling Subaru for a price. It's getting bypassed or its off to the junkyard I go.

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