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7 Series - E65 / E66 (2002 - 2008)
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  #26  
Old 01-30-2013, 05:41 PM
bmwoem1 bmwoem1 is offline
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Carbon build-up will absolutely cause a rough idle and misfire faults (p0300). The intake manifold does not come off when you do plugs and coils. Ask your bmw tech to check his bulletins on this issue. I will post the bulletin # when I get a chance
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  #27  
Old 01-30-2013, 06:01 PM
nr123 nr123 is offline
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Thanks again for your help, how long should it take for the mechanic to clean the carbon buildup when removing the intake manifold (curious how many hours he would bill for)? ALSO - does this cause hesitation when starting the car first thing in the morning? Thanks again.
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  #28  
Old 01-30-2013, 06:04 PM
bmwoem1 bmwoem1 is offline
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The bulletin is 12 02 12. This bulletin has changed over the years to include n54 carbon buildup, but the dealer techs w/ experience should be familiar
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  #29  
Old 01-30-2013, 06:06 PM
bmwoem1 bmwoem1 is offline
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Labor should be about 2 -3 hrs on top of removing the intake manifold. These valves are not as easy to clean as they are on the n54
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  #30  
Old 01-30-2013, 06:22 PM
nr123 nr123 is offline
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Thanks again for your feedback, I just called my mechanic and left him a message to check for carbon buildup, will post back when I hear from him tomorrow hopefully.
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  #31  
Old 01-30-2013, 06:25 PM
nr123 nr123 is offline
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Just wanted to ask though about a long crank in the morning when starting the car, is that normal with a carbon buildup?
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  #32  
Old 01-30-2013, 10:52 PM
kjruben kjruben is offline
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Quote:
Originally Posted by bmwoem1 View Post
The intake manifold does not come off when you do plugs and coils.
Hello, in the 760 V12 the intake manifold DOES need to be removed to replace the plugs and coils. The whole intake is right over them and there is no room to pull up the coils or plugs unless you remove it. On the V8 it's a different story.

NR123, When I replaced my coils and plugs I started having misfires as well and it turned out to be the intake gaskets. The dealer recommends the gaskets to be replaced when the intake is removed. At first i didn't believe them but once I replaced them I stopped having the misfires.
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