Ford

Have Ford questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

PO171 code intermittent rough idle I think I head a vacuum…

Customer Question
PO171 code...

PO171 code intermittent rough idle I think I head a vacuum leak under the intake manifold but can't locate

Mechanic's Assistant: Is the rough idle intermittent or consistent?

THe code has been up for a long time but intermittent rough idle started recently, seems like it occurs every 40 sec or so & have have to give it a bit of gas

Mechanic's Assistant: What is the model/year of your Ford?

1997 Ranger 2.3

Mechanic's Assistant: Are you fixing your Ranger yourself? What have you tried so far?

I checked MAF, put in new fuel filter, looking for leaks

Submitted: 9 months ago.Category: Ford
Show More
Show Less
Ask Your Own Ford Question
Answered in 11 minutes by:
12/2/2017
Ford Mechanic: Kenny Z., Ford Senior Master Tech replied 9 months ago
Kenny Z.
Kenny Z., Ford Senior Master Tech
Category: Ford
Satisfied Customers: 6,131
Experience: Auto Trans, Drivability and Electrical Specialist
Verified

Hello, my name is***** and thanks for your question.

I have seen the PVC tube, grommet and oil separator leak vacuum on these, its located below the intake forward of the oil filter adaptor. Usually spraying brake clean in that area will change engine rpm if it is leaking, if you have a scanner that will show pcm data you can also monitor fuel trims or the O2 sensor while spraying and look for a change.

If you are satisfied with your answer, please take a moment to rate my service as you see fit. Experts are not compensated without a positive rating. Providing a rating does not close the question, you can reply or ask additional questions without incurring further charges.

Ask Your Own Ford Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a ford mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Kenny Z. Your Own Question
Kenny Z.
Kenny Z.
Kenny Z., Ford Senior Master Tech
Category: Ford
Satisfied Customers: 6,131
6,131 Satisfied Customers
Experience: Auto Trans, Drivability and Electrical Specialist

Kenny Z. is online now

A new question is answered every 9 seconds

How JustAnswer works:

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

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:

AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on.

Rich DUSA

Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me.

MollyUSA

I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service.

Jason V.Kirkland, WA

I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there.

BRNew Jersey

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 PElm 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.

PhilMarysville, CA

< Previous | Next >

Meet the Experts:

Ron

Ron

ASE Certified Technician

25,182 satisfied customers

23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs

Chris (aka- Moose)

Chris (aka- Moose)

Technician

29,223 satisfied customers

16 years experience

John Mc

John Mc

Ford Technician

5,495 satisfied customers

19 years Ford Lincoln Mercury experience

Chuck

Chuck

ASE Certified Technician

1,685 satisfied customers

33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance

Cam

Cam

Journeyman Automotive Technician

10 satisfied customers

GM Grand Master Technician 2007. 14 years Automotive experience.

Mike V.

Mike V.

Auto Service Technician

1,591 satisfied customers

25 years experience on all makes and models, Licensed NYS Inspector.

Richard

Richard

ASE Certified Technician

1,524 satisfied customers

12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.

< Previous | Next >

Related Ford Questions
Ford Ranger: 97 Ford Ranger with a 2.3 liter ,Calif smog, 8
97 Ford Ranger with a 2.3 liter ,Calif smog, 8 plug 4 cyl... Idles beautifully for about 5 minutes then runs really rough, vacuum drops from 18 when running great down to 13' vacuum and fuel pressure … read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
I have a 1989 ford ranger with a 2.3 liter engine I checked
I have a 1989 ford ranger with a 2.3 liter engine I checked it with an OBD 1. With the Key On Engine Running. It showed code 21 engine coolant temp sensor out of range. Code 22 MAP(vacuum) or BARO sig… read more
david
david
Heavy Duty Repair Mechanic
Vocational, Technical or Trade Scho
495 satisfied customers
02 ford e350 6.8l v10, code po171 and p0174, couldnt find
02 ford e350 6.8l v10, code po171 and p0174, couldn't find any vacuum leaks, changed fuel filter, was some water and trash, checked fuel pressure 40 psi, any ideas before i pull pump and see if there … read more
Steve
Steve
Ford tech Specializing in electronics
Associate Degree
1 satisfied customers
1996 Ford Ranger: trans..idles..valve job) , radiator..Runs fine
1996 Ford Ranger 2.3l man trans idles really rough. Just had head gasket (with valve job) , radiator, intake gaskets, plugs and wires replaced and it hunts for idle when stopped. Runs fine at speed al… read more
rpmdiag
rpmdiag
High school
7,967 satisfied customers
1997 Ranger: Diagnostic..Trouble code..air filter..Mass Air Flow
I have a 1997 Ranger, 2.3L engine, 4 cyc with an Diagnostic/Trouble code PO171 and have replaced air filter and the Mass Air Flow sensor...............where do I go from there?… read more
Brian
Brian
Ford Senior Master Certified Shop Forema
Vocational, Technical or Trade Scho
1,228 satisfied customers
check engine light..running rough..mass air flow..air flow sensor
check engine light still on and truck running rough changed all four oxygen sensors and changed the mass air flow sensor.… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
Ford Ranger XLT ford ranger xlt, 2.5L, 4 cyl. has Po171 code.
ford ranger xlt, 2.5L, 4 cyl. has Po171 code. Originally had Po171 and 174 codes. Replaced Mass Air Flow Sensor; EGR Valve and Solenoid; and O2 sensor before cat. Have not pulled injectors. They sound… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
I have a 2003 ford ranger with the following codes PO316-P2195-PO171-
I have a 2003 ford ranger with the following codes PO316-P2195-PO171- PO301-PO705-PO300. I have changed coil,wires and plugs fixed trans range sensor bvut still not running right lots of stumbling and… read more
AMEDEE
AMEDEE
AUTOMOTIVE TECHNICIAN
Vocational, Technical or Trade Scho
9,105 satisfied customers
97 ford ranger: diagnostic..it the fuel injector pressure regulator
diagnostic trouble codes po171 an po174 on my 97 ford ranger what is it an how can I fix it. Is it the fuel injector pressure regulator? thanks vinny… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
1997 ford ranger: pickup..o2..egr vacuum senser..runs fine
still looking for the problem on 1997 ford ranger pickup xlt. Replaced o2 senser 1 an 2, replaced egr vacuum senser, ecc idle control valve. still will not idle when you start cold runs fine the frist… read more
Tim West
Tim West
Service Manager
Computer/ Automotive certifications
16 satisfied customers
Pm151: the maf with contact cleaner twice..fuel filter..running rough
I got a po171,and po174 with a progresively rougher idle. I sprayed the maf with contact cleaner twice and changed the dpfe and fuel filter and a suspect vacuum hose. Still running rough and the new c… read more
Ron
Ron
ASE Certified Technician
Vocational, Technical or Trade Scho
25,182 satisfied customers
1997 ford ranger: liter..idels..rough..I put new plugs and wires in it
2.3 liter 1997 ford ranger idels rough.I put new plugs and wires in it.Nothing changed.They where very old.… read more
Fordanswerman
Fordanswerman
Ford Senior Master Technician retired
Associate Degree
2,912 satisfied customers
97 ford ranger: flow..two upstream 02sensors engine light comes..po171
97 ford ranger 4.0 changed mas flow and two upstream 02sensors engine light comes on again showing po171 174 codes. runs much better as before it was surging and dying… read more
FORDFXR
FORDFXR
MASTER TECHNICIAN
Vocational, Technical or Trade Scho
138 satisfied customers
1997 Ford Ranger XLT: complete stop..sputters..dies..only happens
Whenever I come to a complete stop in my 1997 Ford Ranger XLT it sputters and dies...This only happens when the engine is warm on cold days, warm days its fine, when the engine is cold its fine. Any i… read more
Scottdagoalie
Scottdagoalie
Vocational, Technical or Trade Scho
1,663 satisfied customers
1998 Expedition: mi..mileage..CRD MAF spray cleaner with no change
1998 Expedition, 135K mi, 5.4L has P0171 and P0174 codes, and is idling rough and stumbling. Poorer mileage also. I cleaned the MAF using CRD MAF spray cleaner with no change. Cleared codes, then chec… read more
Chris (aka- Moose)
Chris (aka- Moose)
Technician
Vocational, Technical or Trade School
29,223 satisfied customers
Ford: rough..the fuel sensor replaced and the intake manifold
We recently had our work truck into a Ford dealer. It's been running a bit rough, and consuming a lot of gas. We've had the fuel sensor replaced and the intake manifold, but they don't know what is wr… read more
Dennis
Dennis
Senior Master A Technician/Shop Foreman
Vocational, Technical or Trade Scho
758 satisfied customers
1997 ford ranger: 88,000 miles..check engine light..code reader..P0171
i have a 1997 ford ranger that has 88,000 miles on it.the check engine light come on,so i hooked up a code reader on it.the code is P0171 system to lean bank 1.i need to know how to fix the problem.i … read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
1997 ford contour: check engine light..timing belt..water pump
1997 ford contour 169k miles. check engine light on po171. just had timing belt, accessory belt and water pump changed, along with oil and filter change. Now car is idling rough and low, stalls at lig… read more
HDGENE
HDGENE
Master Technician/Lead Technician
Associate Degree
2,835 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x