Question about 2000 Ford Ranger SuperCab

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The air mixture screw does not make my mixture richer or leaner

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Unless your vehicle is really old and has a carburetor there shouldn't be an air mixture screw. Air and fuel mixture ratios on engines with Electronic Fuel Injection or EFI are controlled by the vehicle computer witch receives and sends information to and from a slew of different sensors like the oxygen sensors, throttle position sensor, the idle air control valve, Etc. Chances are you have EFI on your vehicle. If your engine is running rough or lacks power, try a complete tune up. New spark plugs/wires, new fuel filter, new air filter, oil and filter change, new oxygen sensors. Try running a bottle of injector cleaner and a bottle of water remover through the vehicle and see if it helps. Hope this helps.

Posted on Nov 19, 2009

  • Adamcole1213 Nov 20, 2009

    If you do have an older vehicle with a carburetor and turning the air mixture needle in or out doesn't make any differences in leanness or richness, the carb most likely has a bad needle seat or needle. Or the carb may need a complete rebuild.



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Hi Alan:
A bit more info would help, like what kind of vehicle, and any symptoms.
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Sputter rpm

When a car warms up it enters closed loop state. This is when the computer uses the sensor inputs to adjust air/fuel ratios.
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