Quote:
Originally Posted by 76FJ55
One other concept that I don't remember if it was mentioned is if you have a misfire, or dead spark on a cylinder it could cause your lean measurement even though you may have the correct fueling. an O2 sensor only measures oxygen content in the exhaust stream, so if you have uncommuted fuel with the associated unburned oxygen you will have a lean reading on the WBO2.
this may also account for the poor fuel economy, since you will be spending fuel that is not generating the associated amount of work.
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Correct, and a cyl balance test by simply unplugging an injector one at a time can easily find the cyl not firing.