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6 Series
The BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #26  
Old 03-16-2013, 10:50 PM
Dynamicfigure Dynamicfigure is offline
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Location: WA
 
Join Date: Sep 2010
Posts: 97
Mein Auto: 2005 - 645 Coupe
Knocking

This problem honestly made me second guess everything. The BMW regional mechanic even came in, looked at the car and said it was "normal." I can say after driving the car for another 40K miles that the sound is still there - not much worse, not better in any way at all and the engine still seems sound. I get the occasional increased emissions warning that everyone seems to get (ethanol free gas seems to usually cure it), and have had a couple small things done, but the knocking sound is obvious as ever w/no adverse effect (that I can tell) yet to the engine...
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  #27  
Old 03-18-2013, 10:12 AM
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petriej petriej is offline
Cruising 280 Top Down
Location: San Jose, CA
 
Join Date: Jul 2010
Posts: 6,088
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Mein Auto: '99 M3 Cab & '05 X5 4.8is
Wow old thread! Check your spark plugs.
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2005 X5 4.8is Le Mans/Black/6spd Steptragic
1999 M3 Cabrio TiAg Metallic/Dove Grey/Black 5 Speed Manual
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  #28  
Old 01-26-2014, 12:22 PM
hammerhead75 hammerhead75 is offline
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Location: idaho
 
Join Date: Jan 2014
Posts: 1
Mein Auto: 2004 645ci
The TICK

Im an engine builder from the marine and nascar world and just bought a 2004 645ci and it too has the "tick" this one ticks at an idle but goes away around 1200rpm which doesnt really raise any alarms with me but for a so called luxury car I agree it shouldn't be there so its back to basics to find this "tick". If it disappears at a higher rpm that indicates oil pressure to a loss pump lifter. If a bearing is going out it will go out very quickly not in thousands of miles. If it is a valve train issue after the engine is brought to temperature if a valve cover is removed a infared heat detector pointed at each lobe will tell you yes or no instantly if theres a issue. There are also oil additives that make your oil slippery slimey I wouldnt recommend leaving this oil slime in but for trouble shooting absolutely these are things to do at home so Joe mechanic doesnt want to replace your brakes for this "tick". Im gonna do these ecact things and tell the results
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