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First you locate the connector. On my 94 Ford Explorer it is behind the air breather. It is a two wire connector that doesnt really connect to anything.

It may have a shorting bar installed in the plug or it might have been removed. If removed (pins not shorted together) this simply retards the timing 3 degrees to eliminate any engine pinging. Mine was removed before I bought it and have been driving without it for years...

Hope this answer has been of some help...

KB

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Q: How do you check to see if the octane adjust circuit is open?
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