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I finally got around to looking at this (busy weekend).
Dead silent when I turn the key on without starting.
I hooked the o2 sensor back up and took it for a 1/2 hour drive - it ran beautifully. Steady state mixtures around 14.3-14.8. excursions during accelration/ decel.
After I got it home I checked frequency. About 43% at idle, 50% with the o2 disconnected.
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1981 911 SC
2013 Mini Cooper JCW
2017 GMC K1500
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