How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Matt Carey Your Own Question

Matt Carey
Matt Carey, Auto electrical technician
Category: Car
Satisfied Customers: 258
Experience:  6 yrs professional experience/ and training
Type Your Car Question Here...
Matt Carey is online now
A new question is answered every 9 seconds

2000 ford explorer: cyl..stalls..air filter , maf sensor..fuel filter

Customer Question

2000 ford explorer , 6 cyl , p0141 and po147 system too lean bank 1 and 2 car has no power but runs , sometimes stalls and is sluggish , replaced air filter , maf sensor , fuel pump and fuel filter ! nothing changed ! ?
Submitted: 3 years ago.
Category: Car
Expert:  Matt Carey replied 3 years ago.
Chat Conversation Started
Matt Carey :

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

Customer :

have not checked fuel pressure but installed new fuel pump cant find and vacum leaks

Customer :

could it be a bad o2 sensor ? if so wich one ?

Customer :

system too lean bank 1 and 2 only codes , freaze frame data shows fuel system closed loop

Matt Carey :

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)

Matt Carey :

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

Customer :

its 4.0 ohv pushrod , i think only 2 o2 sensers , and its 0141 and 0174 codes sorry

Matt Carey :

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.

Matt Carey :

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?

Matt Carey :

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

Customer :

cant find any vacum leaks

Matt Carey :

Do you have a Volt/ ohm meter? or Scanner? How have you looked for vacuum leaks?

Customer :

i checked for leaks with carb cleaner and i do have a volt meter and a obd11 scanner

Matt Carey :

For the P0141 code, unplug the rear O2 and check the resistance (ohms ) reading of the heater in the sensor.

Matt Carey :

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.

Customer :

thats behind the cat correct

Matt Carey :

For the Bank 2 lean code, (P0174), can you watch fuel trims on your scanner? Or is it just a code reader?

Matt Carey :

Yes behind the CAT.

Customer :

just code reader , so it should be between 3 and 30 ohms ? and if its not ?

Matt Carey :

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.

Customer :

ok i will check that out

Matt Carey :

Let Me know what you find, thanks, MATT

Matt Carey :

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?

Customer :

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

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician