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Code 31 always appears if you do the test not running the engine. You need to replace the Air Flow meter if code 73 always appears.


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If your engine is non-catalized (20NE as you say), it should have a trim to ajust the %CO at idle. A wrong trim can cause bad idling. Anyway you should do the paper clip test and check if there are any error codes saved.


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You don't adjust the air flow meter, the meter's job is to give accurate air flow readings to the engine computer to it can adjust the fuel-air mixture. If the air flow meter isn't delivering accurate information to the computer then it needs to be cleaned/repaired, not adjusted. Most allow no type of adjustment anyway. It may be it just needs a clean, how ...


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