Question about Ford Escort
Between air filter and throttle body
Posted on Apr 13, 2015
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Posted on Jan 02, 2017
SOURCE: Location of sensors
IAT SENSOR IS MOUNTED INSIDE INTAKE AIR HOSE TO THE AIR CLEANER ASSEMBLY. THE MASS AIR FLOW SENSOR IS ALSO MOUNTED TO THE INTAKE AIR HOSE OF THE AIR CLEANER ASSEMBLY. O2 SENSORS LOCATION.YOU HAVE 2 # O2 SENSORS.YOU HAVE ONE THE EXHAUST MANIFOLD.THE OTHER SENSOR LOCATED DOWN AT THE CATALYTIC CONVERTER.
Posted on Aug 19, 2009
B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter
You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks
Posted on Oct 20, 2009
I am working on the same problem. This 2000 ZX2 was idling rough and throwing a p171 code (bank 1 too lean). I hooked up a scanner to the OBDII port and you could see the O2 sensor at 0 or very low voltage and not switching and the fuel compensation maxed out which indicates a lean condition. Using a flammable Carb cleaner and the engine running I sprayed around the vacuum hoses until the idle picked up. I found a rubber elbow that connects to the bottom of the intake maniflold and feeds vacuum to the PCV valve. Replacing the the elbow with a suitable replacment from the auto part misc parts cards display had it running smoothly and the O2 sensor switching properly. Since this was happening at idle it was not the fuel filter which can cause a lean condition in upper rpms. It is not the MAF or the O2 sensor since it switches when not at idle. Also check the smaller vacuum lines that go to the evap control from the intake vacuum ports (back of manifold just below the throttlebody, most will be cracking if your car is anything like mine. I have also seen this problem with a bad PCV valve.
Posted on Jun 14, 2010
If I doint mistake, the MAF (Mass Air Flow) sensor is located on the top back of the intake manifold under the engine cover.
1) Air cleaner assy 2) Upper cover 3) Lower cover
4) Lower cover Cushion 5) Lower cover Spacer 6) Lower cover Bolt
7) Filter element 8) Air inlet duct 9) Air inlet duct Insulator
10) Resonator 11) Resonator Cushion 12) Resonator Insulator
13) Air temp sensor 14) Air temp sensor Grommet 15) Adapter
16) AIR MASS SENSOR 17) Inlet duct 1.6 liter 18) Resonator box
Hope helps (remember to rate this answer).
Posted on Feb 10, 2011
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