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 Steve Your Own Question
Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 24104
Experience:  BMW Expert
26942375
Type Your BMW Question Here...
Steve is online now

Car runs much better with maf sensor disconnected, is this

Resolved Question:

car runs much better with maf sensor disconnected, is this good for the car
Assistant: Does the engine stall right after starting? And what about hesitation or jerking during acceleration?
Customer: no engine does not stall. it hesitates in 2nd and sometimes 3rd gear gets smokey sometimes to. other times you can drive it and not experience any problems
Assistant: What is the model/year of your BMW?
Customer: bmw x3 2.0 diesel m sport x drive 2009
Assistant: What year is your X3?
Customer: 2009
Assistant: Are you fixing your X3 yourself? What have you tried so far?
Customer: yes its had a new turbo and air intake pipes.
Assistant: Anything else you want the mechanic to know before I connect you?
Customer: turbo been checked and all good. been informed to have air system checked
Submitted: 1 month ago.
Category: BMW
Expert:  Steve replied 1 month ago.
what color is the smoke that you see?
Customer: replied 1 month ago.
just normal really like when a car is first started, no blue colour or that
Customer: replied 1 month ago.
normal smoke no colour just the same as you would see when a vehicle is first started
Customer: replied 1 month ago.
no blue colour or that
Expert:  Steve replied 1 month ago.
It should not run better with maf disconnected. This means either the maf is bad or you have an intake air leak of some kind. Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.
Customer: replied 1 month ago.
where can air leak be coming from. i find it strange that car runs 100 times better with maf disconnected. the main air intake pipe to the turbo has been renewed and tightend and checked and is all good what other pipes might be leaking.
Expert:  Steve replied 1 month ago.
The leak could be literally anywhere in the intake system or caused by a failed crankcase ventilation system. A smoke test is the definite test for the intake and a vacuum test for the crankcase vent. Please do not forget to click on a positive rating
Steve and other BMW Specialists are ready to help you