Thumping Noise After Shutdown
#1
Thumping Noise After Shutdown
My friends and family are all tired of me obsessing about my new car, so I'll run this past you guys as you're the only ones who seem to understand the obsession.
I have a new 07 MCS with 700 miles - Last night after I shut down the engine I was sitting in the car on the phone for a while when I heard a noise - at first I thought it was someone bouncing a basketball nearby. Eventually realized it was the car - when I opened the door I could hear it better - almost sounded like a little backfire... a thwump/bang/pop that seemed to be coming from the undercarriage, not a knock from the the engine compartment. I was still stuck on the phone, so it made further investigation a little difficult. There was also sort of a whirring noise, which I assume is a cooling system?..
Does anyone have any idea what I'm talking about? The car is driving fine - no strange noises other than this, after I shut it down. Do I worry? Do I call MINI? Help?
I have a new 07 MCS with 700 miles - Last night after I shut down the engine I was sitting in the car on the phone for a while when I heard a noise - at first I thought it was someone bouncing a basketball nearby. Eventually realized it was the car - when I opened the door I could hear it better - almost sounded like a little backfire... a thwump/bang/pop that seemed to be coming from the undercarriage, not a knock from the the engine compartment. I was still stuck on the phone, so it made further investigation a little difficult. There was also sort of a whirring noise, which I assume is a cooling system?..
Does anyone have any idea what I'm talking about? The car is driving fine - no strange noises other than this, after I shut it down. Do I worry? Do I call MINI? Help?
#4
#5
the motor humming is actually an electronic water pump that runs coolant thru the turbo to cool down.
the thumping noise could be the metal exhaust pipes flexing/contracting due to heating/cooling. my s2000 makes loud tikin' noises after the car is shut off and it comes from the exhaust. so a turbo car would make them also since it runs hotter...
the thumping noise could be the metal exhaust pipes flexing/contracting due to heating/cooling. my s2000 makes loud tikin' noises after the car is shut off and it comes from the exhaust. so a turbo car would make them also since it runs hotter...
Last edited by joey1320; 12-29-2007 at 09:02 AM.
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My car does it as well. Its the DMTL pump (Diagnostic Module Tank Leakage) running. Basically its a small electrical pump that pressurizes (only very slightly, if at all) the fuel tank while monitoring the pump current draw to check the fuel system for leaks, i.e. a loose gas cap. As to why it makes the thumping noise I have no idea myself. I've never heard another BMW Group vehicle with the same system make this noise before. I highly doubt its harmful or detrimental in any way just a unique characteristic of the R56 I guess.
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One easy way to tell would be to have someone listen for the thump inside and someone else open the gas cap. I've been meaning to do this, but it's way down on my list.
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I think this is what I've heard on my MC CVT '06 and now on my Clubman MCCa - it sounds like a muffled thump, thump, thump. I've heard it while stopped at a light, after morning start up... and then when I've turned the engine off having driven for a good amount of time. Mentioned it to my SA with the '06 and they never could find anything wrong.
I'd be happy to believe it was just a normal noise - and from this thread it sounds as though it is.
I'd be happy to believe it was just a normal noise - and from this thread it sounds as though it is.
#21
My car does it as well. Its the DMTL pump (Diagnostic Module Tank Leakage) running. Basically its a small electrical pump that pressurizes (only very slightly, if at all) the fuel tank while monitoring the pump current draw to check the fuel system for leaks, i.e. a loose gas cap.
Sounds very similar to how the hydraulic pumps on BMW SMG and Ferrari F1 gearbox cars sound when you open the door.
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Exactly!!!! in all honesty...it is ALMOST 99% likely cause.
My Miata tings and burbs a bit after a long run. My Vulcan Nomad does it too.
Also it makes a slight whistle.whinnee. That is the air escaping the gas tank via the venting hole in my gas tank, around my cap. When I insert the key and open whoosh...and noise stops!!! depending on how full the tank is it does it longer or little..also depends on humidity...
Hope that helps anyone else with these noises...
Like eating a bunch of hot dogs and beer at a tailgater weekend NFL party ...your gonna do lot of that too!!!!