Quote:
Originally Posted by California98Civic
Filters too. Check fuel and air filters for clogging. ...but I like the O2 sensor for air infiltration from that crack screwing with the ECU.
Maintain and repair the most obvious first... then move on to less obvious... you'll find it.
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The air filter is clean, and the fuel filter is in the tank and is supposedly not a maintenance item, but I changed it at around 200K miles, and cold starting and throttle response improved, and I think mileage improved a little. I think you are onto something with the crack in the header pulling air into the exhaust, o2 sensor sees the exhaust as lean, computer adds more fuel to compensate, engine runs rich. Good suggestions.