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 Randall C Your Own Question

Randall C
Randall C, ASE Certified Technician
Category: Car
Satisfied Customers: 11134
Experience:  32 years Foreign / Domestic Cars All aspects of Diag and Repair
Type Your Car Question Here...
Randall C is online now
A new question is answered every 9 seconds

Scion TC: Why engine stalls when lights are turned on?

Resolved Question:

Engine stalls when lights are turned on? Whenever I turn on the headlight, or turn signal, or press brake, or change gear, car nearly stalls or completely stalls. I can't drive car in this condition. I just got this car (in this condition). The battery that was cracked and leaked acid. So I thought it was just that I needed a new battery. I already did buy a new battery, and it did not help. It might be something unrelated. I don't know. Thank you!

Submitted: 10 months ago.
Category: Car
Expert:  Randall C replied 10 months ago.
Hello, I am Randall. I have reviewed your question and working on it now.
Sorry for the delay
Kind of hard to say exactly whet the problem is but,, most common? you have a dirty throttle body
They get gummed up over time and the computer can not maintain idle as required when loads are placed on
I would have charging system checked, just to be sure you have 13.8-14.5 volts at the battery, running. Just a check to eliminate as a possible charging problem
I am still thinking dirty throttle body
You need a can of carb cleaner. remove the air intake hose from the throttl e body
Gently spry the bore inside , put hose on, start, rev and blow out. Clean up till say 4-5 times till shiny as shown below
This should eb done once per year
Aside from this? it then need to be on a scanner to see how sensors etc are all performing
Worst case could? need a new throttle body as the idel control is built into it but.. let's not go there , I am leaning to dirty throttle butterfly and throttle body bore

graphic

Customer: replied 10 months ago.


Hello again. The battery acid got everywhere, including cables and everywhere. I noticed the cable/connector that is attached to the starter got somewhat damaged. Also, on the starter itself there is a lot of this acid and the connector was covered in the acid. I cleaned it off, but there still seems to be some damage there. Could this play a role? Would a bad starter, or bad starter connection cause a car to stall once running? Or does the starter only become engaged on the initial start-up? Thank you

Expert:  Randall C replied 10 months ago.
starter wiring should play no role in stalling. Acid on a componet other than starter wiring yes,, but I can not answer that.
I highly suggest the Throttle body cleaning as this may fix the problem. If not? then inspect all wiring real close at the throttle body as the idel and throttle control arte computer controlled or "fly by wire" damage to wiring at throttle body is possible
Customer: replied 10 months ago.


Well, I was wondering if perhaps It might not be a throttle issue because the problem presents itself when there is an added electrical load, such as turn signal, or turning on headlights. What do you think?

Expert:  Randall C replied 10 months ago.
Still clean the throttle body. Gummed up and computer can not react to loads fast enough and causes stalling exactly like you describe. In the shop? this is the very first thing done. Wiring? possible with acid on or near throttle body wiring but.. That is not common at all so I have to tip toe into that one.
Randall C, ASE Certified Technician
Category: Car
Satisfied Customers: 11134
Experience: 32 years Foreign / Domestic Cars All aspects of Diag and Repair
Randall C and 12 other Car Specialists are ready to help you

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