Stalling at junctions
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Thread: Stalling at junctions

  1. #1
    Settling in at MT Emin-j's Avatar
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    Stalling at junctions

    Hi all, I posted previously about my r53 Cooper S occasionally stalling at junctions but for the past few months it hasnít happened but last week it started stalling again, the weird thing is it only happens on my way to work early mornings, I thought it may be temperature related so replaced the tmap sensor (genuine BMW) but this morning it stalled again grrr !
    Strange that it never stalls on my way home (around 3.30pm) other than idling unevenly for a short time occasionally but I think this is common with the r53s.
    Engine is standard serviced regularly with new plugs fitted a few months back.
    The stalling seems worse slowing suddenly from say 50mph whereas if slowing down gradually it idles ok.
    No codes stored or pending.
    Any ideas guys ?

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    Fuel filter?

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    MT Plus Member R53-Luke's Avatar
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    Gotta press the pedal furthest left.

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  6. #4
    Settling in at MT Emin-j's Avatar
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    Quote Originally Posted by Maccmike View Post
    Fuel filter?
    I did think maybe the filter but thought if there was any obstruction in the filter it would affect performance more in the higher rev range where There would be more of a demand for fuel but worth noting, plus it only happens occasionally,weird.

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    Settling in at MT Emin-j's Avatar
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    Quote Originally Posted by R53-Luke View Post
    Gotta press the pedal furthest left.
    Wondered what that was for

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    MT Plus Member CarsOrBikes's Avatar
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    first thing that comes to mind is an air leak
    Exclusive Workshops'Driving The Experience' Official supplier of M Factory Competition Products, YCW Suspension, YCW Engineering, Swift Performance Springs. Infinitude Autosports, Synchrotech Transmissions Inc. Official Installer and Service Centre for Swift, YCW, M Factory, Exclusive Workshops Performance Final Drives, Gear Sets and Race Transmissions.

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    MT Plus Member DoubleP's Avatar
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    Throttle positon sensor A.K.A throttlebody might start to come end of it's life

    Lšhetetty minun F8331 laitteesta Tapatalkilla

  10. #8
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    Sounds like a vacuum/air leak. Check all of your hoses, but particularly the one going to the air box: it can look fine superficially but perish inbetween the ribs.

  11. #9
    Settling in at MT Emin-j's Avatar
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    Thanks guys, Iíll have a close look at the air/vacuum hoses, the air box hose I changed to a silicon one but if it was an air leak wouldnít the problem be there all the time ? 95% of the time it runs sweet itís just the odd time it catches me out
    I was tempted to replace the throttle body, but not sure what the unit actually does other than supply a regulated amount of air to the supercharger, is there a connection to the ecu which would affect the idle speed ?
    Thanks again guys.

  12. #10
    MT Plus Member CarsOrBikes's Avatar
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    air leaks can reduce as temp rises and causes expansion hence why when cold, the car that needs more fuel to run smoothly doesn't want additional unmetered air or it might lean off and hesitate or stall etc.
    Exclusive Workshops'Driving The Experience' Official supplier of M Factory Competition Products, YCW Suspension, YCW Engineering, Swift Performance Springs. Infinitude Autosports, Synchrotech Transmissions Inc. Official Installer and Service Centre for Swift, YCW, M Factory, Exclusive Workshops Performance Final Drives, Gear Sets and Race Transmissions.

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