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 Mechanic Martyn Your Own Question

Mechanic Martyn
Mechanic Martyn, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 987
Experience:  Advanced trade certificate in Automotive engineering
17982882
Type Your Australia Car Question Here...
Mechanic Martyn is online now
A new question is answered every 9 seconds

Ford EF I have a EF Falcon with an auto transmission and recently

Customer Question

I have a EF Falcon with an auto transmission and recently replaced the break booster. shortly after that it stopped going into top gear and soon after that will only change up at about 4,000 RPM. I have changed the gearbox and the problem remains. Any suggestions or help Please.
Geoff
Submitted: 3 years ago.
Category: Australia Car
Expert:  Curtis replied 3 years ago.
Has the one way valve on the booster been replaced, is the valve working correctly, is there another air leak. You will need to check these as it will cause these symptoms.
Customer: replied 3 years ago.
I have checked all the suggested areas and can not find any air leaks and all valves appear to be working correctrly.
regards Geoff (Does the computer play any part in the gearbox shift function?)
Expert:  Mechanic Martyn replied 3 years ago.

Hello and welcome to Just Answer

There are two things on the EF that cause this

1. is the inhibitor switch or gear position switch - it tells the computer what gear you are in as well as preventing starting in gear. If it is faulty the ecu doesn't know what to do.

2. Is the Throttle position switch, if this is faulty the computer drops into kickdown and flares the engine or drops into limp mode.

Thats the most common causes in my experience. I imagine the new gearbox came with a gear position switch fitted so I'd go for the throttle position switch (TPS)

regards

Mechanic Martyn

Mechanic Martyn, Australia Car Mechanic
Category: Australia Car
Satisfied Customers: 987
Experience: Advanced trade certificate in Automotive engineering
Mechanic Martyn and other Australia Car Specialists are ready to help you
Customer: replied 3 years ago.
Thank You. Your information was helpfull. In the process of checking things I have found that the changing up at high reves was caused by the econ/powere button being moved to the power position. I now believe that changes are happening correctly although a little more chuncky that I remember. I am of the opinion that it is stil NOT going into top (4th).
Expert:  Mechanic Martyn replied 3 years ago.

Hello again

4000 rpm is still very high even with the power option in.

I have an EF and an AU and worked on countless falcons. I have never experienced gear changes that high unless the throttle was very hard depressed.

If you are only on half throttle the changes should occur much earlier.

This may get better with a bit of driving with one driver as the computer learns the driving style of that driver.

After the gearbox change it will be a relearn but this usually takes only around 30 to 50kms.

regards

Mechanic Martyn

Customer: replied 3 years ago.
Additional information that I gathered today while driving. The gearbox doesn't "drop down" when you plant your foot such as for overtaking. it almost apears as if it is locked into kickdown mode permantly
Expert:  Mechanic Martyn replied 3 years ago.

Ok this usually indicates a problem with the information getting from the TPS to the ecu and down to the transmission. It can be a TPS (throttle position switch) problem.

In which case remove the wiring plug on the TPS and spray the contacts with a contact cleaner - this may help but if the TPS is faulty it will need replacing.

OR - It could be an ECU problem - can be replacd with a second hand one but ...

TRY checking the harness down to the gearbox, give every connection a wriggle and a open and clean, a loss of even a tiny voltage over a dirty connection can cause problems.

Check that plug into the gearshift position switch again.

Try going for a drive with the TPS disconnected if its the same then that will be the cause. Under $100 on ebay.

regards

Mechanic Martyn

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
  • 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:

 
 
 
  • Curtis

    Australia Car Mechanic

    Satisfied Customers:

    1605
    Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TechCurtis/2010-10-21_204813_jaavatar.png Curtis's Avatar

    Curtis

    Australia Car Mechanic

    Satisfied Customers:

    1605
    Qualified Automotive Mechanic, LPG & Airconditioning Diagnostic Technician.
  • http://ww2.justanswer.com/uploads/GL/GlennBradley/2012-9-1_102754_DSCF3324c.64x64.jpg Glenn Bradley's Avatar

    Glenn Bradley

    Australian Car Mechanic

    Satisfied Customers:

    664
    Ex Transmission Shop Owner, Driveline Specialist, 30+ years in the Australian Automotive Industry
  • http://ww2.justanswer.com/uploads/BR/Brogs70/2011-5-4_13942_weddingpicsfromMelandVicki004.64x64.jpg Scott B's Avatar

    Scott B

    Australia Car Mechanic

    Satisfied Customers:

    478
    Qualified Automotive Mechanic, Service Manager & Proprietor 20+ years
  • http://ww2.justanswer.com/uploads/Technopro/2010-04-14_162248_Arm_JA.jpg Technopro's Avatar

    Technopro

    Australia Car Mechanic

    Satisfied Customers:

    129
    15+ years of experience in Automotive Repair Techniques and Diagnosis Expert.
  • http://ww2.justanswer.com/uploads/MA/MarkBarnes1967/2011-8-13_93816_MarkakaTOMUCH.64x64.JPG Mark's Avatar

    Mark

    Mechanic

    Satisfied Customers:

    571
    26 Years as a Vehicle Mechanic in Australian Military
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Engineer

    Satisfied Customers:

    437
    Automotive Engineer for 20 years, BEng hons degree,
  • http://ww2.justanswer.com/uploads/gemmechanic/2009-05-04_110543_dsc07268.jpg Mechanic Martyn's Avatar

    Mechanic Martyn

    Australia Car Mechanic

    Satisfied Customers:

    303
    Advanced trade certificate in Automotive engineering