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 Mark Your Own Question

Mark, Technician
Category: Car
Satisfied Customers: 1504
Experience:  Qualified City & Guilds
Type Your Car Question Here...
Mark is online now

hi can anyone help? i have a m reg golf tdi, revs increase

Customer Question

hi can anyone help? i have a m reg golf tdi, revs increase on ther own sometimes,has done it when changing gear like throtle is sticking but has also done it while in nuetral when my foot was not on the pedal,had to turn it off,thought it was going to keep going and blow up.started her up again and was fine?
Submitted: 4 years ago.
Category: Car
Expert:  Mark replied 4 years ago.



This could be due to a fault with the turbo or the engine oil level. The first thing to check is the engine oil level when the engine is cold and on a level surface.



Customer: replied 4 years ago.

oil level is fine,and isnt using any. i understand the accelerator is controlled by something electronic as opposed to a traditional cable,would you rule this out as the cause of the problem? if it is the turbo could you give me your opinion on weather this is something that could be fixed or in your experience would it be cheaper for me to just replace it, as im sure you will appreciate money is tight and the age of the car doesnt warrant spending a fortune,your advice is much appreciated,thanks. Richie

Expert:  Mark replied 4 years ago.

The accelerator is electronic. There is a position sensor at the pedal and a fuel quantity sensor and adjuster on the pump.


The next thing to check is the accelerator pedal position sensor is good and the wiring going to it.

App1 test


App2 test


After that the next test is at the pump.






What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • 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
  • 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!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • 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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • 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

Meet The Experts:

  • Greg



    Satisfied Customers:

    Automotive diagnostic tech
< Previous | Next >
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician
  • Rob's Avatar


    ASE Certified Technician

    Satisfied Customers:

    30 years trade experience
  • uk_iaibal's Avatar


    UK Car Mechanic

    Satisfied Customers:

    Verified Car Mechanic.
  • Billy's Avatar


    Trainer/ Master Technician

    Satisfied Customers:

    Trainer 8+ years, master tech. 10+ years, SAE member
  • Mike Kelly's Avatar

    Mike Kelly

    Auto Service Technician

    Satisfied Customers:

    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.