BMW

BMW questions? Ask a BMW repair Expert for answers.

Ask an Expert,
Get an Answer ASAP!

Mini cooper: When I let off the gas, coasting to a stop the…

Customer Question
When I let off the...
When I let off the gas, coasting to a stop the mini jerks like it is about to stall. Is this normal? Would a mechanic be able to adjust something? I is a 2012 cooper automatic.
Submitted: 3 years ago.Category: BMW
Show More
Show Less
Ask Your Own BMW Question
Answered in 3 hours by:
6/25/2015
BMW Mechanic: Matt, Engineer replied 3 years ago
Matt
Matt, Engineer
Category: BMW
Satisfied Customers: 23,613
Experience: Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
Verified
Hello
If you don't have a check engine light this sounds like it could be
an airleak after the airflow meter, any air dragged in here isn't 'seen' by the ECU and so not compensated for and can lean the engine out and can also allow the engine to rev up when not desired causing rough running.
As its a mechanical fault it tends not to turn on the fault light and you can sometimes hear a 'hissing' noise with the engine running.
Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the small bore pipes and fittings for cracks and missing parts.
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.
Now you might think that spraying lighter gas around a hot engine isn’t wise, however the flash /ignition point of gas is about 400°C so you need a naked flame or spark to set it off and I’ve used this method for many years without incident.
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.
It’s also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will all result in insufficient fuel being delivered to the engine
Ask Your Own BMW Question
BMW Mechanic: Matt, Engineer replied 3 years ago
Hi
do you still need help?
Ask Your Own BMW Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a bmw mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Matt Your Own Question
Matt
Matt
Matt, Engineer
Category: BMW
Satisfied Customers: 23,613
23,613 Satisfied Customers
Experience: Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing

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:

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 PElm City, NC

used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future.

David L.Richmond, TX

9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much.

PhilMarysville, CA

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.

CharlesWalnut Creek, CA

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!

SueCharleston, WV

Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff.

JimCastleberry, FL

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

< Previous | Next >

Meet the Experts:

Roger

Roger

BMW Master Tech

3,050 satisfied customers

10 yrs. experience as BMW Master Technician, shop foreman and dealer.

Marty

Marty

ASE Certified Technician

560 satisfied customers

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

bimmaster

bimmaster

BMW Technician

1,838 satisfied customers

3 years dealer experience, master bmw tech

Sam

Sam

BMW Master technician

1,043 satisfied customers

BMW S.T.E.P. graduate, 10 years BMW dealership experience

Thebmwbum

Thebmwbum

BMW Foreman

714 satisfied customers

31 years BMW Experience

mike

mike

BMW Technician

694 satisfied customers

bmw master tech ase certified

Matt

Matt

Engineer

23,613 satisfied customers

Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing

< Previous | Next >

Related BMW Questions
A week ago I bought a used 2012 Mini S all4 a few days ago.
A week ago I bought a used 2012 Mini Cooper S all4 a few days ago. It has 70k on it. My problem is the engine light is now on and the car won't excelerate above 25mph. Any ideas? … read more
Kevin
Kevin
workshop foreman /master tech/mot tester
1 satisfied customers
What does it mean when the engine light comes on but is half
what does it mean when the engine light comes on but is half yellow … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Actually 2012 Mini. No way to fix that little monster by
All of the warning lights lit up, the RPM indicator stayed at 0, every single warning indicator displayed in the indicator window and the gas guage went from full to empty several times. I shut it down then restarted the mini, after about five minutes of running on more warning symbols flashed and the Mini drove fine. … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
I have a 2012 mini and the half engine light just came on DO
I have a 2012 mini cooper and the half engine light just came on DO you know what that means … read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
My Mini had a replacement engine put in, 40,000 on
My Mini Cooper had a replacement engine put in JA: How many miles are on the car? Is it an automatic or a manual transmission? Customer: 40,000 on replacement t engine JA: What year is your MINI? Cust… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Car will not run properly have to unplug VANOS to get it to
car will not run properly have to unplug VANOS to get it to stop misfiring. … read more
sprinkles08
sprinkles08
Technician
High School or GED
11 satisfied customers
I have a 2008 mini with a 1.6 engine. When the car is warmed
I have a 2008 mini cooper with a 1.6 engine. When the car is warmed up the idle is to low and the car stalls … read more
Jared D
Jared D
Shop Supervisor
Bachelor's
3 satisfied customers
I have a 2005 mini cooper convertible and the top wont go down
I have a 2005 mini cooper convertible and the top wont go down all the way. The sun roof opens and then the windows go down and everything. It unlatches but then it stops. When I put it back to normal… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
2009 s mini. From a dead stop if accelerate normally for a
2009 s mini. From a dead stop if accelerate normally for a second and then take my foot off the gas there is small knock noise that I can hear like a bad motor mount or something??… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Mini Cooper: 2005 Mini Cooper revving and lurching at 30mph
2005 Mini Cooper revving and lurching at 30mph with RPM's jumping to 4-5 before settling down and getting into gear. Above 50 and below 20mph cars appears to drive fine. Stalling out occasionally at s… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Hardtop S: Hello – I have a 2013 Mini Cooper S Hardtop (w/Steptronic
Hello – I have a 2013 Mini Cooper S Hardtop (w/Steptronic shiftable automatic transmission), with 8800 miles. I'm looking for someone qualified to service Mini Coopers.… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
My 2003..higher than normal rpm for speeds above 40 mph, (ie..50 mph
My 2003 Mini runs at a higher than normal rpm for speeds above 40 mph, (ie. 4000 rpm @ 50 mph). It seems the CVT does not progress through its entire cycle and stops at a certain velocity. It is in au… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
mini Cooper: What type of gasoline does the mini cooper need? Any
What type of gasoline does the mini cooper need? Any advantage to nitrogen gas in mini coopper tires? Does the mini moon roof when closed have a cover to block sun light?… read more
molurch
molurch
Owner
Vocational, Technical or Trade Scho
941 satisfied customers
I really really want a mini cooper convertible..s had more problems
Hi...it is getting late in Little Rock....hope I am not keeping anyone up past bedtime......but...I really really want a mini cooper convertible.............are there years where the mini's had more p… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Mini Cooper..automatic transmission often bucks..slowing moving
Our 2005 Mini Cooper with an automatic transmission often bucks when it is in low gear, particularly when slowing moving from a stop. Is this a symptom of a safety concern? Or is it just a characteris… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Convertible..Automatic..hesitation/pause when shifting into reverse
2006 Mini Cooper Convertible - Automatic 62K miles. I am a dealer and purchased off lease from an auction. There seems to be a hesitation/pause when shifting into reverse or drive?… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
I RECENTLY PURCHASED A 2006 MINI COOPER WITH AUTOMATIC TRANSMISSION.
I RECENTLY PURCHASED A 2006 MINI COOPER WITH AUTOMATIC TRANSMISSION. I NOTICED THAT WHILE DRIVING AT HIGHWAY SPEEDS (50MPH +) THE TACHOMETER SHOWS THE THE RPM'S GO UP IF I TAKE MY FOOT OFF THE GAS PED… read more
Stephen, MBA
Stephen, MBA
Master's Degree
166 satisfied customers
Mini Cooper..shifting..clutch is almost all the way engaged
Hi Josh, I have a 2005 Standard Mini Cooper. It boggs or stuters when shifting into 1rst gear when the clutch is almost all the way engaged. Sometimes it doesn't do it at all. Might have to with fuel?… read more
Kenny
Kenny
Vocational, Technical or Trade Scho
889 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