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When engine is warm, it goes into loop control monitoring lambda via the O2 sensor. I would check this sensor, since a really bad reading from this would cause the ECU to command the EHA to send the mixture outside operating parameters. Bad output from the ECU to the EHA valve might also be a cause.
Steve
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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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