They said they adjusted for a lean condition, but the idle would increase if they did that... So they reset it back to the lean condition and said it was a bad idle control valve.
I'm fairly competent with cars, but this is new to me.
Connect a voltmeter to the output wire/s of the lambda and ground the other lead.You should see roughly 500 millivolt and if not,turn the 3mm screw.Adjust CO only after the engine is thoroughly warmed up.
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