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 Virtual Wrench Your Own Question

Virtual Wrench
Virtual Wrench, Master Tech
Category: VW
Satisfied Customers: 14428
Experience:  30 years/Master Tech. Foreign and Domestic
2617050
Type Your VW Question Here...
Virtual Wrench is online now
A new question is answered every 9 seconds

Why does my car turn off when I stop and am idling?

Customer Question

My car sometimes shuts off at a stop light, car is idling, then just shuts off. Usually I have all power in lights, radio, etc. Just the engine. On the instrument panel, I have the check engine light and the battery light. Can you tell me why? Does it have to do with my car idling to low for RPM or do I need a new battery?
Submitted: 8 years ago.
Category: VW
Expert:  Virtual Wrench replied 8 years ago.

Hello,

Does the battery lite only come on at idle?

Customer: replied 8 years ago.

Yes, the battery light actually only goes on when the car stalls, once I put it in park and then restart, it ALWAYS restarts no problem and all instrument lights turn off. Everything is fine. It's sporadic, I have had since May 07 and it's a 1999, but it's only stalled about 6 times. I have replaced timing belt a few months back, but happened before that too. IT's automatic.

Expert:  Virtual Wrench replied 8 years ago.

Thanks

That would be normal for those lights to come on when the engine stalls.

This sure sounds like either a vacuum leak in one of the little vacuum hoses on the engine, or it could be the IAC valve (idle air control).

What is the year, mdel and engine size of this car?

Customer: replied 8 years ago.

1999 VW Jetta GLS-auto, 2L engine 4 cylinder

Expert:  Virtual Wrench replied 8 years ago.

Thanks,

This doesn't use an IAC valve for idle control, it uses a TPS (throttle position sensor) for one,,,to control idle.

The most likely suspect is going to be a vacuum leak somewhere under the hood. If you were to run it by pretty much any shop, they wont charge much at all to pop the hood and take a look around,,they will have a better idea of where to look.

At any rate, its not going to be a major repair at all, just tricky to find :-)

If you have further questions on this, please feel free to reply.

Happy Holidays!

Virtual Wrench, Master Tech
Category: VW
Satisfied Customers: 14428
Experience: 30 years/Master Tech. Foreign and Domestic
Virtual Wrench and other VW Specialists are ready to help you
Customer: replied 8 years ago.
Just to clarify, on another website, they advised it could be one of the following:

Idle speed is incorrect
Fuel filter clogged and/or water and impurities in the fuel system
Ignition components damp or damaged
Faulty emissions system components
Faulty or incorrectly gapped plugs
Faulty spark plug wires
Vacuum leak in the fuel injection system, intake manifold or vacuum hoses

So you think it is the last option and can confidently rule out the others?

Thanks, ***** ***** help!
Expert:  Virtual Wrench replied 8 years ago.

You are very welcome :-)

The first line correlates with a vacum leak (idle speed is incorrect) the next ones i can definatly rule out, if it was ignition related or fuel related, you would have a hard time restarting it,,if at all.

If there are no vac leaks present, you might be able to just tweak up the idle.

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
< Previous | 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
  • 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
 
 
 

Meet The Experts:

 
 
 
  • vwnewton

    vwnewton

    VW Owner,ASE Master and L1 Advanced

    Satisfied Customers:

    307
    25 years of VW obsession turned into a job, last 15 years as a VW Tech.
< Last | Next >
  • http://ww2.justanswer.com/uploads/vwnewton/2008-12-27_221405_JA_avatar.jpg vwnewton's Avatar

    vwnewton

    VW Owner,ASE Master and L1 Advanced

    Satisfied Customers:

    307
    25 years of VW obsession turned into a job, last 15 years as a VW Tech.
  • http://ww2.justanswer.com/uploads/audidoc/2008-12-23_175252_headshot.jpg VWDoc's Avatar

    VWDoc

    Independent VW Shop owner

    Satisfied Customers:

    1729
    20 years of experience working with VW's. Independent European shop owner and technician.
  • http://ww2.justanswer.com/uploads/CA/carbezerk/2011-3-13_103612_SAM0048.64x64.JPG Martin's Avatar

    Martin

    auto electrical

    Satisfied Customers:

    658
    South African Trade Diploma in Auto Electrical
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Engineer

    Satisfied Customers:

    588
    Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    457
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    VW Mechanic

    Satisfied Customers:

    392
    Shop owner and experienced in most brands.
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    374
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL