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 Genchi Genbutsu Your Own Question

Genchi Genbutsu
Genchi Genbutsu, Toyota Master Technician
Category: Toyota
Satisfied Customers: 3977
Experience:  Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine
Type Your Toyota Question Here...
Genchi Genbutsu is online now
A new question is answered every 9 seconds

A 2000 r runner , engine light on and stalling/backfiring..p0171..lean

Customer Question

i have a 2000 r runner , engine light on and stalling/backfiring when sarting off cold. when warm still not 100%. code p0171 lean mix bank 1...trying to find vac leak with no luck....recommendations?
Submitted: 3 years ago.
Category: Toyota
Expert:  Genchi Genbutsu replied 3 years ago.

Genchi Genbutsu :

The P0171 code is for a Lean condition which is why I suspect that you are looking for a vacuum leak. What tests have you performed and what parts have you replaced?

Expert:  Genchi Genbutsu replied 3 years ago.
What Happens Now?

Your chat has ended, but you can still work with your Expert to get an answer to your question if you have not yet received one.

Come back to this page at any time to see additional information from your Expert.  You will also receive an email when your question is updated.  If you want to send a message to your Expert, use the box below.

If you have already received a satisfactory answer to your question, click the Accept button above.  Experts are credited for each accepted answer they provide.
Expert:  Genchi Genbutsu replied 3 years ago.

The P0171 code is for a Lean condition which is why I suspect that you are looking for a vacuum leak. What tests have you performed and what parts have you replaced?

 


Please reply back.

 

Genchi

 

Customer: replied 3 years ago.

I already know the code and what it stands for. I had this in my original question. I have replaced fuel filter and o2 sensor in front of catalytic. I had toyota and a mechanis say it sounds like a vac leak on the passenger side / bank 1. i am looking for help on identifying (location) of leak.

 

Expert:  Genchi Genbutsu replied 3 years ago.

Have you checked the MAF sensor for debris on the wires yet?

 

Genchi

 

Customer: replied 3 years ago.

yes, did not find anything

 

 

 

Expert:  Genchi Genbutsu replied 3 years ago.

With the engine running, have you tried spaying carb cleaner in and around the intake area?

 

Genchi

 

Customer: replied 3 years ago.
no, but problem mainly happens when cold. once car warms up it gets a lot better but not 100% at full throttle
Expert:  Genchi Genbutsu replied 3 years ago.

That will be the next item to check. What you will want to do is when it is cold, use some carb cleaner (anything spay flammable that will not damage your 4Runner) and direct it toward each area of the intake and listen for any changes in the way it idles. If it has a vacuum leak, it will suck in the spray and idle up higher. That will give you and idea of where the leak is occurring and then you can tear it down to inspect.

 

We don't have many of these issues but when the P0171 is present, most often it is the MAF sensor. I know you checked it and found it good.

 

Genchi

 

Expert:  Genchi Genbutsu replied 3 years ago.

Do you still need help?

 

 

Customer: replied 3 years ago.
it idles ok. it is when i put it in drive and start driving is when in stalls and back fires. i can put the pedal to the floor and it we seem like it is starved and wants to die. i have to let off step on it, let off step on it and it will finally begin accelerating.
Expert:  Genchi Genbutsu replied 3 years ago.

This sounds just like a MAF problem. In addition to the check listed above, I would replace the MAF, clear the code and retest drive it. It will probably make one heck of a difference. Please only use OEM Toyota MAF sensor.

 

Genchi

 

Customer: replied 3 years ago.

Thanks i willtry but do you think it might be the rear o2 sensor (behind catalytic)?

Expert:  Genchi Genbutsu replied 3 years ago.

No, please do not waste you hard earned money on replacing the O2 sensor, it will not fix this issue.

 

Genchi

 

Genchi Genbutsu, Toyota Master Technician
Category: Toyota
Satisfied Customers: 3977
Experience: Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine
Genchi Genbutsu and 3 other Toyota Specialists are ready to help you
Customer: replied 3 years ago.
thank you
Expert:  Genchi Genbutsu replied 3 years ago.

My pleasure.

 

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:

 
 
 
  • THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU! Jughead USA
< Last | Next >
  • THANK YOU, THANK YOU, THANK YOU!! I've got my baby back. Tomorrow I will get a tank of high octane, remove the top, go for a long long ride and enjoy my car. THANK YOU! Jughead USA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    347
    ASE Master Automobile Technician with over 20 years exp. in this field.
< Last | Next >
  • http://ww2.justanswer.com/uploads/CA/caprio23/2011-12-13_155550_20111213105344.64x64.jpg Anthony's Avatar

    Anthony

    ASE Certified Technician

    Satisfied Customers:

    347
    ASE Master Automobile Technician with over 20 years exp. in this field.
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Auto Technician

    Satisfied Customers:

    198
    16 years of experience
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    ASE Certified Technician

    Satisfied Customers:

    152
    ASE & Bosch Master Tech. 30 years experience.
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    Toyota Technician

    Satisfied Customers:

    1112
    ASE Master Technician advanced level specialist
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    9
    Toyota tech. ASE Certified Technician
  • http://ww2.justanswer.com/uploads/SK/skyvisions/2012-6-9_23736_JACropped3.64x64.jpg Skyvisions's Avatar

    Skyvisions

    ASE Certified Technician

    Satisfied Customers:

    10709
    Toyota Master Diagnostic
  • http://ww2.justanswer.com/uploads/genchigenbutsu/2009-05-09_003043_cimg16431.jpg Genchi Genbutsu's Avatar

    Genchi Genbutsu

    Toyota Master Technician

    Satisfied Customers:

    3393
    Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine