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 Mike Your Own Question

Mike
Mike, UK Car Mechanic
Category: UK Car
Satisfied Customers: 38668
Experience:  Hi, I am a Car/ vehicle technician of 34 years. 29of -running my own repair/diagnostic business.
Type Your UK Car Question Here...
Mike is online now
A new question is answered every 9 seconds

BMW 525i: sport..misfire..whole car shakes..rev..it runs fine

Customer Question

Hi there,
I have an 05 BMW 525D sport. Last few weeks it has a misfire in the morning and runs rough the whole car shakes until I rev it and drive about 300 yards then it runs fine. There is no MIL light or anything. I took it to a local garage last week and they thought itwas an injector so they put in a new injector and tried it on all 6 but problem remains. They now think that one of the pistons mightbe an issue and I might need to recondition them or replace the engine !!! I cant believe this is the case as the car drives fine except its down in power abit. On the diagnostics it also shows the Throttle body as an error , could this be causing the misfire ?
look forward to you expertise.
Kind regards,
Chris
Submitted: 4 years ago.
Category: UK Car
Expert:  Mike replied 4 years ago.
Hello Chris - Welcome to justanswer...

I doubt there are any problems with the pistons etc at all..

You need to check , or have checked - maybe elsewhere....the inlet manifold.

There is a known issue with these with the flaps sticking inside... worse case scenario is that they break and go in the engine and literally wreck the engine.. so as you are having such problems.. you need to have this checked out asap....and ideally by someone who has a knowledge of the subject..

Some cars had a recall on this - I know a lot of the 530's were recalled - so have a word with your local Bmw dealer...give them the VIN of the car and they will be able to tell you if the car is subject to a recall and if so, if its been done or needs to be done..

The cure was to replace the manifold - it comes out at about 330£ give or take..but the first thing to do is to speak to the dealer as I say to get the full info on your VIN / car... and then go from there...

But that is the most likely issue here ...

I Sincerely hope I have helped you - Please ask me if you need more help...


Kind Rgds, MIKE

 


  • >>>>>>>>>Please don't forget ....Please press the ACCEPT button if you are happy with my answer/advice given - as that's how I get paid for my time, knowledge and expertise given. Thank you.

 

Feedback and any Bonuses are always appreciated too. Thank you.

Customer: replied 4 years ago.

Hi Mike,

Thanks for the reply - yes we originally thought it was the swirl flaps issue aswell but he removed the manifold and they are fine.So then he thought it was the injectors and we got a new injector from Bosch - he tried this in all six positions but the problem still exists - that is why he know thinks its a piston issue.

Based on recieving a error for throttle body could this casue the issue we seeing ?

Chris

Expert:  Mike replied 4 years ago.
Hello again Chris - thank you for your reply..

My apologies that I couldn't get back to you sooner today..

Okay.. throttle body wouldn't cause cylinder specific misfire Chris.. you (they) need to find out if its is cylinder specific.. that would narrow things down altogether..

The best way to do that is with a compression test... that will tell for sure if there is a piston , cylinder or valve problem.. so that has to be the next step to ID that for sure one way or the other , then you can progress from there..

SO you need to rule out - or find any engine mechanical problems via testing as above first ..

After that - if there are none.. then there are several possibilities that would cause a misfire..
These include air in the fuel, fuel pump problems, filter... fuel rail pressure sensor, fuel rail control valve, fuel quantity adjuster - high pressure fuel pump and lastly, electrical wiring / connection problems..

There's been no mention of any proper diagnostic testing having been carried out Chris - I know there is no MIL on.. but one, make sure the MIL works as a first step.. then general fault code read should always be done regardless of MIL ..and go from there.. fault code directed if present... If none - then other, Live Data tests should be done, inc fuel pressure tests etc..

From what you have said Chris, it does sound as though none of this has been done.. It needs to be - guessing can be expensive for you... ie, replace engine.. very expensive and very much over kill at this stage..

If the garage doesn't have the equipment as above Chris - you need to move it to a garage that has - to be able to do all the testing as above...and then you will get to the bottom of it ..

You might have a piston / engine issue as they have said - but that does seem to have been a bit jumped at from what you have said they have done / not done..

Follow through on the above Chris and you will get there with it - let me know if I can help anymore at all..

Best Rgds. MIKE..


 


  • >>>>>>>>>Please don't forget ....Please press the ACCEPT button if you are happy with my answer/advice given - as that's how I get paid for my time, knowledge and expertise given. Thank you.

 

Feedback and any Bonuses are always appreciated too. Thank you.

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
< Last | Next >
  • 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!!!! Alex Los 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. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, 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. Esther Woodstock, 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. Robin Elkton, 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. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
< Last | Next >
  • http://ww2.justanswer.com/uploads/EU/eurotec/2012-6-11_13153_mpjaphoto.64x64.JPG Marty's Avatar

    Marty

    European Car Expert

    Satisfied Customers:

    349
    ASE & Bosch Certified Master Tech. Over 30 years experience.
  • http://ww2.justanswer.com/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Shop Owner

    Satisfied Customers:

    1040
    17 years Shop Owner /Technician. 27 years experience,
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    UK Car Mechanic

    Satisfied Customers:

    472
    12 years as a technician at a Ford and Jaguar dealer Ford and Jaguar factory certified
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    4034
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.com/uploads/NA/nabilc/2011-1-24_205715_jap500.64x64.jpg Billy's Avatar

    Billy

    Trainer/Master tech.

    Satisfied Customers:

    1276
    Trainer - master tech., SAE member
  • http://ww2.justanswer.com/uploads/witt0018/2009-02-09_180738_trev2.jpg Trevor Witting's Avatar

    Trevor Witting

    UK Car Mechanic

    Satisfied Customers:

    815
    NVQ 3, Modern Apprenticeship, MOT Tester, 15+ years experience diagnostic technician
  • http://ww2.justanswer.com/uploads/RO/RobMechanic/068.64x64.JPG Rob's Avatar

    Rob

    UK Car Mechanic

    Satisfied Customers:

    811
    city and guilds level 1 2and 3. mot tester , 28 years experience set up training college in afghanistan