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Discussion Starter #1
A friend of mine has a 1993 EXT 550 that runs good, but seems to run a little rich. He says there is a sticker on the ECU that says it is equipped with the chip for oxygenated fuel, which is no longer used. If that is the case it would run rich with normal unoxygenated fuel. My question is, did such a chip exist and can it be replaced with a standard chip (if available)?
 
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