Thumps on Turning 545iM Off
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My Ride: #1: 2004 545i; 6-speed manual; Sport Package; Mystic Blue with a gray leather interior and Anthracite wood; CWP; Logic 7.
#2: 2010 535xi Touring; Automatic.
When I turn the key off, I hear a few thumps as the engine stops, like thud-thud-thud-thud. I don't remember that happening before. Should I be worried? Is it like a flywheel stopping, something in the transmission?
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My Ride: 2004 545i 6 spd Sports Package | NAV | PDC | Logic 7 | BT retrofit | SW V13.3
Originally Posted by tab545' date='Feb 14 2005, 08:38 AM
When I turn the key off, I hear a few thumps as the engine stops, like thud-thud-thud-thud.? I don't remember that happening before.? Should I be worried?? Is it like a flywheel stopping, something in the transmission?
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What is it? It is the transmission casing banging against the body when the engine experiences run on.
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My Ride: -04 530D
I think it has something to do with heating and AC. Mine have Webasto diesel stand-by heater what makes all kind of noises whe starting and stopping. I think we have at least as many electrical motors as we have computers in our cars.
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Originally Posted by tab545' date='Feb 14 2005, 09:38 AM
When I turn the key off, I hear a few thumps as the engine stops, like thud-thud-thud-thud.? I don't remember that happening before.? Should I be worried?? Is it like a flywheel stopping, something in the transmission?
[snapback]89974[/snapback]
My car is dead quiet when I shut it off. Sounds like it's a run-on problem after shut-off. Do you have the 15.2 software?
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My Ride: 2004 545i 6 spd Sports Package | NAV | PDC | Logic 7 | BT retrofit | SW V13.3
Originally Posted by wolverine' date='Feb 14 2005, 09:15 AM
Try this:? from a stop, engage the clutch in reverse, then quickly push in the clutch pedal.? You should hear a muffled rattle from the transmission.? Does the thumping sound like this??
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My Ride: #1: 2004 545i; 6-speed manual; Sport Package; Mystic Blue with a gray leather interior and Anthracite wood; CWP; Logic 7.
#2: 2010 535xi Touring; Automatic.
Originally Posted by wolverine' date='Feb 14 2005, 10:15 AM
[My car is dead quiet when I shut it off.? Sounds like it's a run-on problem after shut-off.? Do you have the 15.2 software?
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Thanks for all the comments.
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My Ride: 2004 545i 6 spd Sports Package | NAV | PDC | Logic 7 | BT retrofit | SW V13.3
Originally Posted by tab545' date='Feb 14 2005, 10:31 AM
[quote name='wolverine' date='Feb 14 2005, 10:15 AM'][My car is dead quiet when I shut it off.? Sounds like it's a run-on problem after shut-off.? Do you have the 15.2 software?
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Thanks for all the comments.
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[/quote]No need to go in reverse. Just idle forward in 1st gear. (transmission engaged, car going forward, foot off the gas) Now push in the clutch to the floor. The tranny wobbles as it disengages from the engine. While wobbling it hits the side of the body/chassis. This is the same noise that you hear with engine run-on on shut down.
I have had this for 8,700 miles and 3 software upgrades. Software may fix the run on, but the transmission mounts give enough that it kocks against the chassis. I guess its just a tight fit.
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Originally Posted by Hormazd' date='Feb 14 2005, 10:38 AM
[quote name='wolverine' date='Feb 14 2005, 09:15 AM']Try this:? from a stop, engage the clutch in reverse, then quickly push in the clutch pedal.? You should hear a muffled rattle from the transmission.? Does the thumping sound like this??
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[/quote]That thumping is just caused by the transmission/engine rattling due to loading. It is entirely normal, but the run-on should not happen IMO. I didn't have a run-on problem before the software, so I can't tell you. It might fix the problem, but if it doesn't, they should be able to adjust things to fix the run-on. Do you have any other issues with the engine - throttle response etc.?? The 15.2 rev changes I noticed were steering, RDS on FM now, and my BMW Motorola v70 phone echo problem has been solved.