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 Matt Your Own Question

Matt
Matt, Engineer
Category: Car
Satisfied Customers: 16801
Experience:  Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
12772297
Type Your Car Question Here...
Matt is online now
A new question is answered every 9 seconds

TD5..Lacks power and sluggish..turbo

Customer Question

Defender TD5. Lacks power and sluggish. Massive turbo lag below +-2600rpm. No black or blue smoke. No excessive oil consumption. No excessive wear on turbo spindle (shaft). Air hoses appear good. Injector harness replaced +- 6000km back. No missing. Where can I look next?
Submitted: 5 years ago.
Category: Car
Expert:  Matt replied 5 years ago.
Hi
The first thing to do really is to get a diagnostic check done, this should show a fault code if you have failed sensor or lack of boost. Also you could fit a turbo boost gauge to show what your're actually getting, potentially if the wastegate is stuck then as soon as the turbo boosts up over 20psi the ECU will shut things down and put the car into limp home.

The car should be boosting up over 1 bar by 1800Rpm

Its worth trying a reset ( disconnect battery for 10mins) to clear any fault codes and get the car out of any limp home setting.

Also worth changing the fuel filter if thats not been done in recent months
Matt, Engineer
Category: Car
Satisfied Customers: 16801
Experience: Honors degree in Mechanical Engineering, worked 8 years as a Formula 1 engine engineer.
Matt and 11 other Car Specialists are ready to help you
Customer: replied 5 years ago.

Thanks for the tip. Unfortunately I'm about 250kms from the nearest diagnostic test facility. On checking after I posted the query I found the wastegate stuck. I freed it off and tested vehicle under load. No real improvement. Once up to speed, at about 3000rpm, I can maintain a speed of about 110km/hr. Under load, uphill, down to second gear at times. Fuel filter changed (hopefully) about 6000km ago at service. I'll replace anyway.

 

I'll try the "reset" route. Could it not possibly be the fly-by-wire throttle mechanism - dusty/dirty?

 

Expert:  Matt replied 5 years ago.
Hi
As the vehicle has ben laid up a while its worth checking the conditon of the small rubber pipes from the inlet manifold to the wastegate valve and check the rest of the intake system for any loose hose clips, split hose etc.
I doubt theres any problem with the throttle mech as its all done from the sensor on the accelerator pedal which then controls the injectors.
It may be worth unplugging and checking the pedal sensor for any dirty or recessed pins.

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