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Have you reset the computer? ==-Answer 2== A code 26 would indicate that the car is running rich. WHY its running rich needs to be diagnosed. You can feel pretty sure that you dont have 2 faulty ecms. A new O2 sensor is a cheap attempt at a fix, it is possible that it is not totally gone but giving a rich reading as its on its way out. After that unfortunately you are probably looking at carberator issues and they can be a pain. what year is the car?

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Q: Why would you still have a code 26 after replacing the ECM on an Oldsmobile Delta 88?
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