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Old 05-16-2008, 09:39 AM   #23 (permalink)
Master EcoModder
Join Date: Apr 2008
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Pushrod - '02 Chevrolet Cavalier
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That's interesting.

Not all vehicles run correctly with O2 sensor unplugged; some ECU interpret this as a full lean condition (0 volts on the O2 signal line) and start dumping in fuel. Poor mpg and trailerhitching @ cruise are the usual symptoms.
Most ECUs aren't completely stupid and they will only believe the "lean" condition for so long before they ignore the O2, throw a CEL and switch to open loop.
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