raylyd Posted July 19, 2020 Share Posted July 19, 2020 Hello i have a honda shuttle had replaced o2 sensor and still get running rich on cold start any other ideas i do have hondash app with bluetooth Quote Link to comment Share on other sites More sharing options...
Trevor Posted July 20, 2020 Share Posted July 20, 2020 It will run rich on cold start as the oxygen sensor will run on open-loop until the engine temperature increases and the goes into closed-loop and alters the air fuel ratio to suit. Quote Link to comment Share on other sites More sharing options...
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