Question about 2000 Ford Focus

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2000 ford focus runs rough when I unplug the mass air sensor, but won't start when the mass air sensor is plugged in. How do I fix this ?

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The MAF itself is probaly defective. First check if the filament is dirty, and try cleaning it with MAF cleaner in spray bottle. The way MAF works is that air current cools a heated element resulting in lower resistance. This minute change is further amplified by the circuit in the MAF sensor and fed to the computer. I have never tested a MAF sensor, but I can probably test one. Since the engine don't even start I would probably use a fan, and with the ignition in on position I would probe for voltage changes, that changed with the amount of air rushing through it. There should be a supply voltage, a ground, and the rest would be in series with other sensor, then one would be the input to the computer which varies in value with the amount of air going through.

Posted on Jun 28, 2009


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Is this engine vibration? if so then I would check the air mass sensor, they start to do this when the car is cold and ofetn are fine once the car is warm. You can remove the air mass sensor and clean it up with carb cleaner, this normally fix's them but not always, certainly worth a try before buying anything.

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Get back to me for more ingo.


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