Question about 2001 Ford Escort ZX2
It sound like you have either a defective Mass air flow sensor or it may just be dirty. Now for the most part these components are nonrepairable and should be replaced, but I have on occasion been able to clean them. A MAF sensor is a precise component and disassembly may damage it so you need to be very cautious when doing so. Do not touch the elements and only use an ionized cleanser. Let it dry in open air before assembly do not blow dry with air pressure.
Posted on Apr 28, 2010
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Posted on Jan 02, 2017
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Feb 05, 2016 | Cars & Trucks
The barometric pressure (BARO)
The manifold absolute pressure (MAP)
The intake air temperature (IAT)
The engine RPM
P0121 The predicted air flow and the predicted MAP combined are outside a calibrated range for more than 3 seconds.
Inspect thoroughly for any type of leak or restriction
Air leaks at throttle body mounting area and intake manifold sealing surfaces
Throttle body for dirt, debris, and coking--Refer to Throttle Body Cleaning.
Increase the engine speed slowly to 3,000 RPM, then back to idle.
Exit from the snapshot and review the data.
Observe the Mass Air Flow (MAF) Sensor parameter frame by frame with a scan tool. The MAF sensor g/s should change smoothly and gradually as the engine speed is increased and is returned to idle.
If the MAF sensor g/s does not change smoothly and gradually as the engine speed is increased and is returned to idle, refer to DTC P0101 or P1101.
Broken throttle shaft
Any throttle body damage
If any of these conditions exist, replace the throttle body assembly.
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