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Old 02-21-2014, 08:34 PM
Gen1dak Gen1dak is offline
Dodge Ram Forum Senior Member
Join Date: Aug 2011
Location: MS Gulf Coast
Posts: 1,667
Gender: Male
Vehicle: 1990 RamCharger
Color: Red
Engine: 1988-1991 318ci (5.2L) LA V8 140hp
Rep Power: 5
Gen1dak will become famous soon enough

What do you mean, no O2 sensor? The cat has nothing to do with a primary O2 sensor. The fuel injection is a feedback system. The O2 sensor is required to properly meter the fuel. Without it you basically go to 80%+ of full rich constantly. That's akin to just pouring gas into the throttle body at a constant rate regardless of engine speed. You run way rich at low speeds, the the higher you go, the leaner you run. Even a factory smogger carburetor would do better than that.
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