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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HAVE AN 02 FORD EXPLORER WITH P0102 AND P0113 FAULT CODE.


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Mar 13, 2010 | 2000 Ford Focus

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Ford focus 2004 vibrates when cold and right turns , once the car worms up the vibration calms doun


Hi

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.

They are easy to remove and refit, let me know if you need any help.
Is the cars revs / rpms rough when cold?

If so then most likey it will be the air mass sensor/air flow sensor.

Regards
Dan

Feb 13, 2010 | Ford Focus Cars & Trucks

1 Answer

2000 ford focus engine light on. what could be


Hi
1 is the car losing power?
2 is the car rough at idle? or slightly over reving.

If so most likely cause for 2 is the air mass sensor, this go's to the air box you can cleran them with carb cleaner and sometimes this will fix it.

Get back to me for more ingo.

Regards
Dan

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1 Answer

I have a 2004 f-150 5.4 liter with 100,000 niles


When was the last tune-up?

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Clean Mass Air Flow sensor with CRC Mass Air Flow Sensor cleaner

Change air filter

Change PCV valve (under $10 item)

Ran a tank of Chevron gas with LUCAS fuel system cleaner additive.


Inspect for vacuum leak.
Start from the brake booster (round metal drum) and work you way outward.

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98 ford ranger 4.0L runs very rough when mass air flow sensor is plugged in. runs, but still a little rough but drivable when unplugged. tried new sensor, still the same. any ideas?


did you try cleaning the idle control valve and the egr valve out with carb cleaner.try that before replacing any parts,also if there is any codes in the system those should also lead you in the right direction.

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1 Answer

Can you tell me what code po113 is and how to fix it I have a 2000 ford focus I just changed the mass air flow censor and after two min of changing it the light came on


first unplug mass sensor make sure not corroded or a bent pin when plug back in make sure tight then unplug neg from battery for about 30 minutes will clear codes, might be the sensor itself

Sep 14, 2009 | 2000 Ford Focus

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