UK Car

UK Car Repair Questions? Ask a Mechanic for Answers ASAP

Ask an Expert,
Get an Answer ASAP!

UK Car

My Peugeot 406 20 hdi sometimes it runs ok very powerfull

Customer Question
Hi my Peugeot 406 20...
Hi my Peugeot 406 20 hdi sometimes it runs ok very powerfull and sometimes it runs like without turbo
JA: What year is your Turbo?
Customer: The car is 2000
JA: Are you fixing your Turbo yourself? What have you tried so far?
Customer: No at the mechanic
JA: Anything else you want the mechanic to know before I connect you?
Customer: We tried pressure test everything ok and maf sensor egr and airflow sensor and today we changed the injectors and it did rhe whole fay running good but tonight it went again
JA: Does the engine stall right after starting? And what about hesitation or jerking during acceleration?
Customer: Yes its ok.yes it's jerking during acceleration
Submitted: 3 months ago.Category: UK Car
Show More
Show Less
Ask Your Own UK Car Question
Answered in 20 hours by:
9/7/2017
UK Auto Mechanic: Matt, Mechanical Engineer replied 3 months ago
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 22,239
Experience: BEng hons Mech engineering, in auto industry 22 years
Verified

Hello

This could be a lack of fuel pressure from the electrical pump at the tank.

If the connections to this are corroded or damaged then the pump could stop at any time or could not be running at full speed. Check that its relay switches in and out and the relay contacts are clean and bright – replace the relay if in any doubt and do the same for the fuse,
Ideally measure the pressure at the inlet to the main engine fuel pump and if this is low check the pump as described and also consider changing the fuel filter as if this partially blocked this too will reduce pressure.

If both of these are OK then also check the connections to the EGR valve, if either the vacuum pipe of electrical connection are damaged / corroded then the EGR can be on all time which certainly will hurt performance. Its also possible that its a fault with the EGR valve so its worth removing the valve and cleaning it out with brake cleaner, if it looks particularly clogged then replace it.

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 and its best to have the boost pressure measured actually measured with a boost gauge to check that the turbo is healthy and that the sensor is reading correctly

If its a variable vane turbo (they’ll be an actuator on the turbo body - but not a wastegate) then check its vacuum pipework as above and check the connections to the diaphragm / solenoid valve

Also worth checking that the glow-plug relay is switching off as they can stick on and leave the glow plugs also on - on some cars this can force it into limp home

Also worth considering adding a bottle of injector cleaner into the tank as a clogged injector nozzle will reduce power and give poor combustion - the next stage on from this is to remove all the injectors and have them ultrasonically cleaned and flow checked

Also 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.

Ask Your Own UK Car Question
UK Auto Mechanic: Matt, Mechanical Engineer replied 3 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
Ask Matt Your Own Question
Matt
Matt
Matt, Mechanical Engineer
Category: UK Car
Satisfied Customers: 22,239
22,239 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

413 satisfied customers

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

Greg

Greg

Shop Owner

1,321 satisfied customers

17 years Shop Owner /Technician. 27 years experience,

Richard

Richard

UK Car Mechanic

614 satisfied customers

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

Matt

Matt

Mechanical Engineer

22,239 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

640 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
It won't start after being left for more than a period of 3
It won't start after being left for more than a period of 3 hours and it's not the battery because my battery is just about 6 months old … read more
Gary
Gary
Senior Technician
Vocational, Technical or Trade School
48 satisfied customers
I have a Volvo V50 2006 2.0 Diesel, I had to jump start it
I have a Volvo V50 2006 2.0 Diesel, I had to jump start it on Wednesday after leaving the lights on. … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
The back door of my land cruiser KZJ90 from 1997 is locked,
Hello, the back door of my land cruiser KZJ90 from 1997 is locked, and even with the key, I cannot manage to open it. I have tried to reach the mecanism from inside, but I dont know what to do once I … read more
trung do
trung do
CERTIFICATE OF ACHIEVEMENT
98 satisfied customers
I shipped my Odyssey and had to disconnect the batter for
Hi, I shipped my Odyssey and had to disconnect the batter for over a month. Now I've reconnected the battery but the Navigation system fails to complete it's initialisation and says to contact a deale… read more
Dan
Dan
Dealership Technician
Associate Degree
1,719 satisfied customers
Miss fire under load at low revs. 1990 xr3i mk4 efi. Plugs
yes....plugs leads coil pack ignition module maf sensor...so far … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
Doors does not want to unlock / lock with remote. Batteries
Doors does not want to unlock / lock with remote. Batteries changed but no effect. Unlocking the drivers door works, however none of the others doors is opening from the inside even? … read more
Chris (aka - Moose)
Chris (aka - Moose)
Vocational, Technical or Trade Scho
108 satisfied customers
1997 Grand Cherokee (ZJ) Right Hand Drive (South Africa) '97
1997 Grand Cherokee (ZJ) Right Hand Drive (South Africa) … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
Sunroof wont open on landrover freelander 98. Myself.
hello. JA: Hello. How can I help? Customer: sunroof wont open on landrover freelander 98 JA: Are you fixing your Freelander yourself? What have you tried so far? Customer: yes myself JA: Anything else… read more
Eric
Eric
Retired
N/A
14,436 satisfied customers
My airbag light intermittently comes on. I have moved wires
Second opinion] my airbag light intermittently comes on. I have moved wires in the block beneath my seat and it sometimes goes out… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,321 satisfied customers
I've recently bought a Saab 9-3 aero 210bhp 5 spd, 2004. Car
Hi, I've recently bought a Saab 9-3 aero 210bhp 5 spd, 2004. Car is in good nick & I have just had a new clutch fitted, as this was slipping. I've taken the car back, due to a sought of shuddering whe… read more
Kevin
Kevin
workshop foreman /master tech/mot tester
0 satisfied customers
I need the skim key for my jeep wj 2000
hello i need the skim key for my jeep wj 2000 JA: Okay, I'll connect you to the mechanic to go over that information regarding your Jeep. Before I do, is there anything else you want him to know? Cust… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
4,072 satisfied customers
I have a Isuzu Rodeo LSE 3.2l from 2003. I live in Panama a
Good morning, i have a Isuzu Rodeo LSE 3.2l from 2003. I live in Panama a have a big problem. A guy repaired the alternator and maked a big mistake. I don´t know exactly what he does but now the motor… read more
Dan
Dan
Dealership Technician
Associate Degree
1,719 satisfied customers
VOlvo XC 90 diesel, 2007 94000miles Should we change the
VOlvo XC 90 diesel, 2007 94000miles Should we change the timing belt ? (+tensioner) If yes, What about the water pump ? On that milage is it needed now as well ? If yes, what range of cost would this … read more
fordguy4u
fordguy4u
Automotive Tech
Vocational, Technical or Trade Scho
70 satisfied customers
I have a 08 mondeo 1.8 tdi v-tec .problems starting today
i have a 08 mondeo 1.8 tdi v-tec .problems starting today got it started drove half mile and it cut out now it wont start … read more
Gallagher99
Gallagher99
Ford Senior Technician
Vocational, Technical or Trade Scho
755 satisfied customers
Vwz1z2g4529908. This radio fro my friend. Aftermarket.
vwz1z2g4529908 JA: What is the model/year of your VW? Customer: this radio fro my friend JA: Is this an aftermarket stereo, or did it come with the car? Customer: aftermarket JA: What year is your VW?… read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,321 satisfied customers
Fuel gauge on 325i fault code c7 which sensor is it. Took to
Fuel gauge on 325i fault code c7 which sensor is it … read more
Marty
Marty
European Car Expert
Associate Degree
413 satisfied customers
Oil in the header tank of 911 4 S car is running smoothly at
oil in the header tank of 911 4 S car is running smoothly at present no warning lights show … read more
Technicaldan
Technicaldan
Technician
Accredited
111 satisfied customers
I would like to change washer on diesel injector so
I would like to change washer on diesel injector so searching for torque specifications for assembly, can you assist with those figures? … read more
Greg
Greg
Shop Owner
Vocational, Technical or Trade Scho
1,321 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