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Q: Can a rich air fuel mixture cause engine blow by?
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Improper air/fuel mixture which results in poor fuel economy. The compute and engine will default to a richer fuel mixture to protect the engine. This will also result in carbon build up in the oil and engine which can lead to valve train issues and dirty fuel injectors. Over the long term it will also cause premature failure of the catalytic converter (expensive) since it has to try and deal with all the extra fuel being fed into the engine(rich mixture). You will get and indcation of a engine light on the dash in most vehicle as well and it will not go away. The engine will run like crap and perform poorly.