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Posted on Jan 02, 2017
Have u checked for vacuum leaks or poss leaking EGR valve? use carb spray around the upper intake manifold where it bolts to the lower manifold, spray vacuum lines where they are connected to the engine vacuum ports, the idle speed will change if u hit a leak, as far as the EGR valve goes see if it gets hot at idle, if it does it is leaking, if all checks ok replace the O2 sensor, but i suspect u will find a leak at the upper intake plenum.
Posted on Jan 10, 2009
SOURCE: ford 4.0 v6 misfiring
yes an o2 sensor can cause the mixture to go lean or rich. But you have another culprit also a knock sensor can cause this also. for the miss this is more of what the knock sensor would control. Hope this helps you
Posted on Jan 18, 2009
SOURCE: 172 EGO not switching lean
p0172 means bank 1 of your engine is rich. Need more info on vehicle make model year ect. Could be a sticking fuel injector or on a single bank engine (4 cyl or inline 6 cyl) too much fuel pressure or mass airflow malf.
Posted on Sep 18, 2010
SOURCE: check engine lite on and
Replace the one or two O2 Sensors, that are the closest to the motor,
if they have 80,000 miles or more on them
If you have no idea how old the rear ones are,do them as well
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Posted on Sep 20, 2011
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