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Hi this is MATT, have you checked fuel pressure? Any codes? Also, I would use propane, or carb cleaner, and look for a vacuum leak? Check around the intake manifold, and any vacuum lines. Let me know what you have checked? Do you have access to scan data , such as codes, fuel trims, etc...? MATT
have not checked fuel pressure but installed new fuel pump cant find and vacum leaks
could it be a bad o2 sensor ? if so wich one ?
system too lean bank 1 and 2 only codes , freaze frame data shows fuel system closed loop
P0141 is bank 1 sensor 2 , O2 heater circuit, that is the O2 sensor on the pass side , down stream sensor (rear). unplug the sensor and check the resistance of the heater in the O2 sensor. It should be 3-30 ohms between the two heater wires on the O2 sensor ( usually the two black wires on the sensor side/ unplugged)
Does your Explorer have 3 or 4 O2 sensors? P0147 is for B1 S3 O2. Which motor size do you have? 4.0 OHV or SOHC or 5.0 ? DO you have access to a scanner to look at O2 voltage data? I'm not showing a P0147 for a 00 Explorer? If no scanner, then you can use a meter to verify O2 voltage. Let me know if you need help. MATT
its 4.0 ohv pushrod , i think only 2 o2 sensers , and its 0141 and 0174 codes sorry
Okay, thanks. I think you have three O2 sensors. Two front and one rear ( after the Cat. Convertor). The P0141 is for the heater circuit for the Bank 1 Sensor 2 ( post CAT ) O2 sensor. The O2 at the rear of the convertor. Unplug it and check the resistance of the heater circuit with an ohm meter. Like I said above.
The Po174 is bank 2 lean. Bank 2 is the driver side of the motor. Look and listen for a vacuum leak? Maybe a leaking vacuum line or PCV elbow? Or spray carb. cleaner while the engine is idling, looking for a change in idle speed caused by the spay?
let me know , what you find. And if you have a scanner, with access to data. Watching fuel trims or O2 data, will help find the problem. MATT
cant find any vacum leaks
Do you have a Volt/ ohm meter? or Scanner? How have you looked for vacuum leaks?
i checked for leaks with carb cleaner and i do have a volt meter and a obd11 scanner
For the P0141 code, unplug the rear O2 and check the resistance (ohms ) reading of the heater in the sensor.
Bad thing is that this O2 heater code will not cause a driveability problem. But it is easy to check, and get rid of that code.
thats behind the cat correct
For the Bank 2 lean code, (P0174), can you watch fuel trims on your scanner? Or is it just a code reader?
Yes behind the CAT.
just code reader , so it should be between 3 and 30 ohms ? and if its not ?
if not within the correct resistance , then the O2 heater is bad, need new O2 sensor. but a bad O2 heater wil not cause driveability problems, just Eng. Light, and codes.
ok i will check that out
Let Me know what you find, thanks, MATT
How is it at Idle? You might want to check the EGR valve. Make sure it is not stuck open, tap on it. You can use a hand vacuum pump connected to the EGR valve , apply vacuum to open the valve, this should make the motor stall. This may also help unstick a stuck EGR valve. Did this problem come on slowly, or all at once? How old are the spark plugs?
egr seems good . plugs ok . car runs great for 3to4 miles and then the throttle goes away and dosent want to go anymore . if i press the gas its like its flooding and a little backfireing and dies after idleing a bit