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 Master Class Auto Your Own Question

Master Class Auto
Master Class Auto, ASE - Master Auto Technician
Category: Car
Satisfied Customers: 253
Experience:  20+ years, full time experience. Specialize in Diagnostics & Electrical
13828642
Type Your Car Question Here...
Master Class Auto is online now
A new question is answered every 9 seconds

Hi i have a 2004 mk triton v6 3.0lt.It idles to high [1400rpm]for

Customer Question

Hi i have a 2004 mk triton v6 3.0lt.It idles to high [1400rpm]for around 15seconds then drop down to 900rpm once warmed up.It does this every time i stop.I have replaced the plugs,fuel pump,fuel filter.Had the injectors done.ecu test,fuel pressure test,fuel treatment,oil change,leads and coil packed tested.Also replaced the idle speed motor.My mechanic says there is no more they can do.Can you please help.Thanks Mark

I HAVE ALSO REMOVED THE THROTTLE BODY AND CLEANED OUT.THERE SEAMS TO BE VERY LITTLE VACUMN ON THE THREE OUTLETS ON TOP OF THE THROTTLE BODY.

Submitted: 5 years ago.
Category: Car
Expert:  Master Class Auto replied 5 years ago.
HiCustomer

1) Are you in Australia?

2) Your idle is elevated, even with engine warmed up, after you make a stop?

Best,
Master Class
Customer: replied 5 years ago.

YES THE CAR IS IN AUSTRALIA.WE LIVE AROUND SEE LEVEL.IT DOES THIS WEATHER IT IS A HOT OR COLD START/RUNNING.SOMETIMES IT ALSO MISSES ON ACCELERATION.THIS HAPPENS EVERY TIME I PULL THE CAR TO A STOP.

I HAVE EVEB TRIED TO LOWER THE REVS TO AROUND 400RPM BY LEAVING THE CLUTCH IN WHEN I STOP.BUT IT PULLS THE REVS UP BACK UP TO 1300RPM WHEN THE CLUTCH IS DEPRESSED.THEN GOES BACK TO IDLE AROUND 900RPM 15 SECONDS LATER.HOPE THIS HELPS

Expert:  Master Class Auto replied 5 years ago.
HiCustomer

OK thanks for update.. Will be answering this as soon. I need to look further into your vehicle, as it differs from the USA exports of same year. (meaning the VW's that were sold to US customers)

Best,
Master Class
Expert:  Master Class Auto replied 5 years ago.

Hi Webplumb,

 

Sorry for delay. You see, I do some background checks on cars sold outside USA. (I live in US and all my books, data and computer data is more geared to US vehicles we sell or import here) You'd be surprised at the equipment and emissions differences from Country to Country!

 

At any rate, there's no system or equipment I came across that concerns me. I have some ideas that will help you quite a bit.

 

First off, your engine shows poor performance. That in itself gives me some immediate direction because of the other symptom. You have a hanging idle as it's called, for one. And - you have what appears to be a misfire as well.

 

Let's do some quick checks >>

 

Obvious things that can cause elevated idle and poor performance:

 

1) A vacuum leak at air intake. This can be anything from an intake manifold gasket cracked at an intake runner, to a vacuum line going to intake, or a leaky power brake booster. Does this problem ONLY happen when your foot is on BRAKE pedal? Try it out. When it acts up release brake. Any change? Try this too: Apply brake in neutral, wait 5 seconds or so and release.. Any change at all?

 

2) As stated above, a vacuum leak, AKA "unmetered air" can cause high idle, stalling and/or poor performance and misfires. Can cause one, some or all of these symptoms. Can cause other symptoms (not listed here) as well.

 

3) Similar to above scenario, when the large, rubber/plastic air intake TUBE mounted to the Throttle body - and then connected to MAF (mass air flow) sensor has a CRACK in it - you have vacuum leak type symptoms most often. This is unmetered air. Check this tube and clamps for it as well, at the MAF.

 

Who tested your fuel pressure as stated in your initial Question? Did they test fuel volume as well? Have you access to a scanner? You may Accept this Answer if you choose. If you do so now, I am definitely here to see this thru. So feel free to post back as needed.

 

Best,

Master Class

Master Class Auto, ASE - Master Auto Technician
Category: Car
Satisfied Customers: 253
Experience: 20+ years, full time experience. Specialize in Diagnostics & Electrical
Master Class Auto and 21 other Car Specialists are ready to help you
Customer: replied 5 years ago.
Thanks iv,e checked for leaks around the intake area.None found.Performance and economy are good.If i drive hard it runs fine[no missing] It only misses ,runs rough when i drive steady but not all of the time?The idle has become slighty better in the last day of driving.The ute has only traveled 65.00kms since new.I feel like it is a fuel problem [starving]could it be the fuel pressure regulator playing up?.I dont know how they tested the fuel pressure.Thanks Mark
Expert:  Master Class Auto replied 5 years ago.

HiCustomer

 

Fuel pressure and volume should be tested. have you scan tool access?

 

 

Master Class

Customer: replied 5 years ago.

I would have to book it in somewhere to get this done.I have had a scan done last week,no codes came up

Expert:  Master Class Auto replied 5 years ago.

HiCustomer

 

Please let me know. I have other checks that would follow. But my detailed Answer above should really do it for you. Just foolow thru it. When you have a hard to solve issue like you do here, it is proper, and pays off, to start with basic tests and work up from there - so long as there are no trouble codes that give us a circuit to inspect first. OK?

 

Best,

Master Class

Master Class Auto, ASE - Master Auto Technician
Category: Car
Satisfied Customers: 253
Experience: 20+ years, full time experience. Specialize in Diagnostics & Electrical
Master Class Auto and 21 other Car Specialists are ready to help you
Customer: replied 5 years ago.
HI I WILL TAKE YOUR SUGGESTIONS TO MY MECHANIC AND SEE WHAT HE CAN DO.IT MAY BE A WEEK OR SO AS THIS IS A WORK CAR AND IS ON THE ROAD ALL DAY EVERY DAY.THANKS AGAIN.
Expert:  Master Class Auto replied 5 years ago.

HiCustomer

 

No worry... Stay in touch over this!

 

Best,

Master Class

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
 
 
 
Chat Now With An Auto Mechanic
Master Class Auto
Master Class Auto
Auto Mechanic
253 Satisfied Customers
20+ years, full time experience. Specialize in Diagnostics & Electrical