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Chasing a misfire 200

posted by  SwedeFreak on  Fri Oct 31 09:30 CST 2014
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last visit: Tue Sep 30 18:15 CST 2014
[RELATED]

I would check the fuel pressure. Before the O2 sensor is called in to tune the mixture, injector duty cycle is longer and the mixture is on the rich side. This can mask low fuel pressure. Once the sensor takes control of the mixture, low fuel pressure can result in misfire as the fuel is not well atomized and doesn't fully combust.

Fuel pressure problems could be the result of a bad regulator or a failing pump/pumps.






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