Question about Porsche 944
REPLACE THE AIRFLOW SENSOR.
Posted on Sep 29, 2009
Well okay if you have the mass air flow sensor unplugged while the cars running and you plug it back in it will stall because the ecu (computer) gets stunned with the data signal coming from the sensor and it try to go from limp mode or base setting to the measurement of air that itis now seeing coming from the sensor and causes the car to stumble or stall.
now that we now that is normal and would happen to any car with a mass air flow sensor. what it the issue? why did you have it unplugged? does the car no run right when it is plugged in and start it after it is plugged in? please let me now what started all of this and if you have any codes in the ecu (computer)? check engine light before you started unplugging the mass air flow sensor?
Posted on Sep 28, 2009
At idle, the engine is running independent from the air Flow sensor. The air flow sensor only takes part when it is above the idle set point to control Fuel: Air ratio.
When you plug in the air flow sensor at this point, it supposes to give no value so the ECU didn't give anymore Fuel to match up with the value from the air flow sensor according the predefined value in its ROM look up table. But it did because the air flow sensor actually did give some value at this point. Therefore Idon't think the problem with the ECU or DME, but the problem with the Air flow sensor gets gunk up inside. Try to clean it first. Basically the sensor reacts and measures its' air flow "door", a metal flap opening wider when more air is being sucked. Anyway, sometimes through age and a worn mechanism, but more likely gunk getting in where the door hinges of the metal flap. You need to take it out, turn up side down and spray really good Carburetor Cleaner to get off all the gunk. Good luck.
Posted on Sep 28, 2009
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Posted on Jan 02, 2017
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