UK Car

UK car repair questions? Ask a mechanic for answers ASAP

Ask an Expert,
Get an Answer ASAP!

We had they turbo replaced and now the turbo works - MOST of…

Customer Question
Hello, We had they turbo...
Hello, We had they turbo replaced and now the turbo works - MOST of the time. It cuts off and we are left without turbo maybe 20% of the time we use it. Of course, when we take it to the mechanic it works. Any suggestions of what they should look for? Thank you in advance. Also, the whole car has stopped twice when excelerating to get onto the highway (which is generally when turbo stops, in fourth gear). Thanks in advance.
Submitted: 11 months ago.Category: UK Car
Show More
Show Less
Ask Your Own UK Car Question
Answered in 2 hours by:
9/16/2017
UK Auto Mechanic: Matt, Mechanical Engineer replied 11 months ago
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 23,455
Experience: BEng hons Mech engineering, in auto industry 22 years
Verified

Hello

I'd first check all the high pressure hoses post turbo/s for any split hoses or cracked metal pipes, also check the ends of the intercooler as its not unheard of to pop the end caps off under high boost.

If this is OK then check the small vacuum lines to the turbo and its connected control solenoid on the bulkhead, any cracks or leaks can give turbo issues
Also have a feel around with your bare hands with the engine running to see if you can feel any escaping gas under your touch. Another method is to use a soap and water solution sprayed onto any suspect areas - if there's a leak it'll bubble up with the engine running

Also check that the vacuum hose running to the dump /or turbo bypass valve is intact with no leaks as if the dump valve is opening prematurely you'll be losing all your boost

If this is OK then remove the high pressure intake hose after the turbo and have a feel of the turbine wheel - there should be no play radially at all - but a little bit of axial / end to end float is normal

one other possibility is that the wastegate actuator spring has gone soft so allowing the wastegate to open prematurely - if your actuator has a threaded end you can increase the preload on it to see if this improves things otherwise these units are quite cheap compared to a new turbo so it may be worth trying a replacement

If this is OK then check for air leaks after the mass airflow meter - The best way to locate a leak is to have the engine running and warm and then spray lighter gas /propane around each joint in turn. If the engine rev's up you've found your leak.
Work your way through each possible joint one at a time and you should find it. I use a slightly flattened piece of brake pipe and some rubber hose from the can of lighter gas to provide a spraying 'wand' and allow a direct blast of gas into each area, especially those difficult to reach with large implements.

Ask Your Own UK Car Question
UK Auto Mechanic: Matt, Mechanical Engineer replied 10 months ago

Hi
do you still need help?
Bear in mind that the site takes a deposit from you at the beginning and this is held by the site until you rate my answer at which point the cash is split between the site and the expert. I am only paid for my work on this question if you rate my answer, using the star system at the top of the screen. Please do not forget! Thank you

Ask Your Own UK Car Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with an uk auto mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Matt Your Own Question
Matt
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 23,455
23,455 Satisfied Customers
Experience: BEng hons Mech engineering, in auto industry 22 years

Matt is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

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:

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

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!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Marty

Marty

European Car Expert

432 satisfied customers

ASE & Bosch Certified Master Tech. Over 30 years experience.

Greg

Greg

Shop Owner

1,367 satisfied customers

17 years Shop Owner /Technician. 27 years experience,

Richard

Richard

UK Car Mechanic

627 satisfied customers

12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified

Matt

Matt

Mechanical Engineer

23,455 satisfied customers

BEng hons Mech engineering, in auto industry 22 years

Trevor

Trevor

UK Car Mechanic

853 satisfied customers

NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician

Rob

Rob

UK Car Mechanic

823 satisfied customers

city and guilds level 1 2and 3. mot tester , 28 years experience set up training college in afghanistan

martin jones

martin jones

UK Car Mechanic

646 satisfied customers

25 years as a mechanic and mot tester, owned own business for 10 years city and guilds trained

< Previous | Next >

Related UK Car Questions
Matt. We have a VW crafter 30 35 Minibus, 2010 model, 2.5L
we have a VW crafter 30 35 Minibus, 2010 model, 2.5L engine. It started 6 months ago with exhaust fumes in the cabin. We could not see the smoke but could smell it. Keep going back and forth to mechanic. He said he cleaned the EGR valve. But no change. Then he suggested changing the DPF. Due the continues smell of exhaust fumes we agreed and had a new DPF. It did not improve the driving but the smell of smoke stopped for a week. Then we started getting thick blue smoke. Once the engine was hit and was doing it automatic cooling the smoke start. We did a motorway drive in case it was the DPF regenerating. The smoke stopped. The mechanic checked again and said we need a DPF diagnostic. Had a full DPF diagnostic by TerraClean. They said DPF is showing empty but when mechanic put camera in the DPF it showed blocked. So DPF was changed again but mechanic also saw a little smoke leaking from Turbo. Turbo express Portsmouth suggested a new Turbo as apparently its more expensive to repair. So New DPF and New Turbo but minibus is still making heavy blue smoke when the engine is hot. This is continuous until we do a motorway run. It then stop for a day but then carry on again. We have spent nearly £3000 and the problem is worse than it was 6 months ago. Advise would be greatly appreciated. Many thanks. … read more
Pete
Pete
Independent Auto Technician
Vocational, Technical or Trade Scho
138 satisfied customers
Navara 2.5 diesel: , I am driving a 2007 Navara (yd 2.5 diesel).
Hi, I am driving a 2007 Navara (yd 2.5 diesel). Whilst I was driving the car started to go by itself to high revs. When I shut the engine it did not stop running and continue to rev out of control wit… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
23,455 satisfied customers
Jaguar S type: Hi I have a Jaguar S type 2.5 V6 08/2004 and
Hi I have a Jaguar S type 2.5 V6 08/2004 and some time ago the gearbox was leaking oil but was working well, then I decided to change the pan, filter, new oil etc, was working fine and was any code re… read more
Richard
Richard
UK Car Mechanic
Vocational, Technical or Trade Scho
627 satisfied customers
1.4 Hdi Desire: Hi Bought my daughter a 54 plate Citreon
Hi Bought my daughter a 54 plate Citreon C3 Desire 1.4HDi 96K on the clock. Everything electrical working, runs nicely, full Mot, main dealer service up to 36K, last service was Dec 2013 apparently, h… read more
Robert
Robert
Mechanic/Roadside assist/Garage Owner
Vocational, Technical or Trade Scho
1,707 satisfied customers
shogun: Mitsubitsi Lreg 3000 petrol auto ECI A/t light flashing
Mitsubitsi Lreg 3000 petrol auto ECI A/t light flashing came on after fluid showed low ,now topped up flashes after driving 4 miles Drives OK 4WD OK, speedo not working and will not go into overdrive … read more
Doug C.
Doug C.
Technician
Vocational, Technical or Trade Scho
49 satisfied customers
Audi Allroad 2.5 Tdi tiptronic: I have a 2004 Audi Allroad
I have a 2004 Audi Allroad 2.5 Tdi tiptronic. Last week we travelled to the Kruger Park and spent about 3 hours travelling at slow speeds of up to 50 km/h and often stopping. All without any problems,… read more
gemmechanic
gemmechanic
Diesel Teacher
Vocational, Technical or Trade Scho
130 satisfied customers
Peugeot 407 2.0hdi: I have a Peugeot 407 2.0 hdi and if you
I have a Peugeot 407 2.0 hdi and if you drive it for aprox 2 miles the turbo cuts out you then turn off the ignition and turn back on and it's fine for another 2 miles or so and you then have to repea… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
23,455 satisfied customers
second gear..slowing down..sound stops when i start to accelerate
any idea my a wurring sound has developed in second gear when im slowing down and drop into second? the sound stops when i start to accelerate in second.… read more
Matt
Matt
Mechanical Engineer
Bachelor's Degree
23,455 satisfied customers
1990 300E: a clacking noise coming..timing..chain..Mercedes
My 1990 300E has a clacking noise coming from the area of the timing change. It is intermintent (not for sure about this spelling) and it sounds to me as if the chain may be a little sloppy. took it b… read more
Mike
Mike
Proprieter / Diagnostic Technician
High School or GED
04 plate i had a problem of oil..hoses..seals..blowing..cover gasket
i have a zafira2.0dti 04 plate i had a problem of oil on the rubber hoses just to the left hand side of the turbo took it to a garage and they said it was the turbo oil seals were away so i got the tu… read more
Robert
Robert
Mechanic/Roadside assist/Garage Owner
Vocational, Technical or Trade Scho
1,707 satisfied customers
vauxhall vectra 1.8 16v 1999...slowing down..braking..gears
Hi. I have a vauxhall vectra 1.8 16v 1999. When I am slowing down either by braking or through the gears, the engine cuts out and stops. The battery light & oil light come onto the dash and the car ha… read more
vauxdoc
vauxdoc
Vocational, Technical or Trade Scho
Mazda 6: 2.5 and 3 Thousand Revs, in fourth or fifth gear.
Regarding Mazda 6 Ts The car will not excelerate above 2.5 and 3 Thousand Revs, in fourth or fifth gear. When under those revs it runs as normal. Please answer or suggest a remedy… read more
Mike
Mike
Proprieter / Diagnostic Technician
High School or GED
my engine..started car loud banging noise..new engine..crank shaft
my turbo went in my engine, i got the turbo reconditioned and fitted when my meganic fitted when started car loud banging noise was coming from engine???mechanic thinks i need new engine my dad who mi… read more
IB Tech Support
IB Tech Support
Technical Support
Technical
34 satisfied customers
Engine management light came..checked everything..only runs..gears
yesterday we have taken this 7 seater (CHARIOT 1997) to london ,running engine management light came on then car drop its speed. we stopped the and car checked everything was ok. We started the car an… read more
gemmechanic
gemmechanic
Diesel Teacher
Vocational, Technical or Trade Scho
130 satisfied customers
A standstill.... accelarate in first gear..rover..reverse..slips
my car seems to be losing pulling power when moving from a standstill.... accelarate in first gear but it seams to be struggling to pull away and pick up speed.... its a 1.6litre rover 214. gear chang… read more
gemmechanic
gemmechanic
Diesel Teacher
Vocational, Technical or Trade Scho
130 satisfied customers
Hi can some please help, im a single woman in Italy about
Hi can some please help, i'm a single woman in Italy about to travel back to the UK in my fiat mutipla, how ever i have a problem with my rear back light indicator, went to a mechanic here and he took… read more
Robert
Robert
Mechanic/Roadside assist/Garage Owner
Vocational, Technical or Trade Scho
1,707 satisfied customers
Laguna: turbo..a big puff of black smoke comes out of the exhaust
The turbo in my laguna has just been replaced now however when putting one 's foot on the accelarator a big puff of black smoke comes out of the exhaust. Any ideas?… read more
Trevor
Trevor
UK Car Mechanic
Vocational, Technical or Trade Scho
853 satisfied customers
new head gasket fitted..car starts fine..acceleration..diagnostic test
hi i have a Landrover Freelander which has had a new head gasket fitted now in has no power the car starts fine but does not move it no acceleration i gave it to a mechanic who could find the fault. i… read more
Matthew Lawe
Matthew Lawe
Bachelor's Degree
240 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x