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, Mechanical Engineer
Category: BMW
Satisfied Customers: 21372
Experience:  BEng hons Mech engineering, in auto industry 22 years
Type Your BMW Question Here...
Matt is online now

I have a BMW X5 3.0L diesel that when I increase pressure on

Resolved Question:

I have a BMW X5 3.0L diesel that when I increase pressure on accelerator it increases speed more than I have accelerated and at same time does a lot of pinging in the engine/manifold and spews a lot of smoke. It does it only when I am accelerating uphill but not going downhill. And I found a lot of black gunk inside the manifold.
Is the fuel sensor damaged/inoperative? Can you suggest a cause? Thank you for your time.
Submitted: 3 years ago.
Category: BMW
Expert:  Shantal-Mod replied 3 years ago.
Hello Piero,

I'm Shantal and I'm a moderator for this topic.

We have been working with the Experts to try to help you with your question. Sometimes it may take a bit of time to find the right fit.

I was checking to see if you had already found your answer or if you still need assistance from one of the Experts.

Please let me know if you wish to continue waiting or if you would like for us to close your question?

Thank you,

Customer: replied 3 years ago.

Not at all I would like the question answered satisfactorily as it will be useful to gauge your experts' knowledge and my outlook working with you guys in the future.

Thank you and best regards


Expert:  Matt replied 3 years ago.
Hello Piero

I think that the engine may be running of engine oil as a deisel will use this as fuel and so run on as you describe

The first thing I'd check is the crankcase pressure relief valve (PCV) these are sprung loaded and are only meant to 'burp' excess pressure every now and then. The exiting gas is piped back to the inlet , however should the valve stick open then the engine tends to suck the air out of the crankcase all the time and this carrys oil over with it.

If you remove the air intake pipe and look inside where the crankcase breather is plumbed in you may find evidence of oil.

If you do find oil replace the valve.

Also check inside the intake just after the turbo for any signs of oil as this would be an indication that the turbo oil seal is starting to fail and a replacement / rebuilt turbo may well be required. 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

Customer: replied 3 years ago.

I have 2 supplementary,related questions:

1) I had run a computer diagnostic which showed as follows: obd2 diagnostics show error code P0192: fuel rail pressure sensor low input.

Do you know if the sensor would contribute to the problem I asked about in any way? Damm thing is sooo expensive for being such as small bugger.

2) I also noticed that while accelerating the power required for the booster to start operating was not being generated & therefore the accelerating very poor.

Does this related to the probability of the turbo oil seal that might be faulty/radial play on the turbine wheel?

Thank you for an early reply as I intend to buy the parts asap. Brgds, P.

Expert:  Matt replied 3 years ago.

a P0192 code may put the engine into limp home and if its genuine then there's probably a lack of fuel being supplied to the main pump

so don't replace the sensor

1st thing to do is replace the fuel filter and if that doesn't help then check the power supply to the lift pump in the fuel tank

and its still worth pulling off the intake pipe to check the turbo
Customer: replied 3 years ago.

I live in northern Panama, Boquete and mechanics here are few and far in between and no one know how to work on a BMW X5.

I have been looking for a replacement cranckcase pressure valve for my E53 3.0d 2006 (I can only check the condition of the current one on this coming thursday) and I have seen on the net that it would be better if I bought a crancase pressure valve of a E70 3.0d because they have a vortex filter which is far superior. Do you agree or can advice me in the purchasing of this valve? Thank you for your kind attention

Expert:  Matt replied 3 years ago.

the later PCV ( Positive crankcase ventilation ) is a better piece and if you can get it then yes its a worthwhile modification

I think there may be a difference in hose sizes though ( the later part being larger) so your original hose may require a clip to hold it on
Matt, Mechanical Engineer
Category: BMW
Satisfied Customers: 21372
Experience: BEng hons Mech engineering, in auto industry 22 years
Matt and other BMW Specialists are ready to help you

What Customers are Saying:

  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • 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
  • 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!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, do indeed know your stuff. Jim
  • 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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • 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

Meet The Experts:

  • Matt


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
< Previous | Next >
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Roger's Avatar


    BMW Master Tech

    Satisfied Customers:

    10 yrs. experience as BMW Master Technician, shop foreman and dealer.
  • Robert's Avatar


    BMW Technician

    Satisfied Customers:

    Fully qualified 19+yrs exp/self employed technician in the UK
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician
  • Rob's Avatar


    ASE Certified Technician

    Satisfied Customers:

    30 years trade experience