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#1
03-19-2007, 07:02 PM
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Engine Death Rattle
I moved the X5 out of the garage to clean the floor and then 15min. later returned it to the garage. The next day after starting the X5 there was a severe engine knock, a check engine light and the cabin filled with exhaust fumes. I let it idle, the engine light turned off and the knocking stopped with no problem since. Not all FX45 owners had this experience and there was never a clear explanation for the knocking and fumes. How about the X5 forum experts. I now know to allow the engine to warm up before shutting down but why should this be necessary? Last edited by v10rick; 03-20-2007 at 08:43 AM. 
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#2
03-19-2007, 11:55 PM
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Knowing more about the "exhaust fumes" would tell the story;
If the fumes were white and somewhat odorless, the engine might have sucked some moisture into a cylinder through the air-box? If the fumes were darker and smelled of oil, a cylinder may have sucked oil past a valve seal? If the fumes smelled of unburned gasoline, a plug may have fouled or coil shorted? There may be better or other explanations, but that's my guess. Hope it doesn't happen again.
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2013 X5 3.5i M Sport 2004 M3 cabriolet SMG
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#3
03-20-2007, 01:18 AM
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u know i think i had the same thing happen twice. everytime i did this:
start the car on driveway park the car in garage switch off ignition the next day: start the car engine knocks white smoke out of exhaust after a few minuts following a few engine restarts everything becomes normal what's going on?
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#5
03-20-2007, 08:34 AM
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Quote:
 for allowing the engine to run. I was about to shut down when the check engine light turned off and the knocking stopped. The rich exhaust fumes continued for awhile longer. When this occured with the FX it was best to let it run, shutting down would make it difficult to restart.
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#6
03-20-2007, 11:55 AM
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#7
03-20-2007, 12:15 PM
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I refer to this as "car wash syndrome". This happens to my 540, X5 and even my Honda Civic. If I start the car and move it out of the garage to be washed, then after washing it move it back into the garage, the next time I go to start it they idle like crap and the exhaust stinks. After about 30 seconds of driving it clears right up. Now when I'm done washing I quick drive around the block and that prevents the starting issue the next day.
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Hers: 2005 X5 4.4 Mine: 1997 540 (way to many mods to list) 
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#8
03-20-2007, 12:52 PM
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Quote:
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#9
03-20-2007, 01:22 PM
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Are you talking about with a hand wash? Never, heard of this...
Quote:
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Mike F Current: 2017 Grand Cherokee HEMI 2017 Kawasaki ZX-14r 2017 Harley RG Ultra 2017 Harley Fatboy S
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#10
03-20-2007, 01:34 PM
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It has nothing to do with actually washing the car, it's the fact that you start the car, move it a couple of feet and then turn it off. That 10-20 seconds of run time makes the start up the next day rough. I'm not saying it happens to all cars, but it happens to all of mine everytime I do this and it happens to alot of other people over on the E39 board that I also visit. I had a 4-Runner before the X5 and didn't have a problem with that.
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Hers: 2005 X5 4.4 Mine: 1997 540 (way to many mods to list)
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good job
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