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7 Series - E38 (1995 - 2001)

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  #1  
Old 02-26-2013, 07:27 PM
Danny Wolfe Danny Wolfe is offline
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Location: USA
 
Join Date: Feb 2011
Posts: 88
Mein Auto: 2001 740i
Exclamation Engine runs rough!

Hello Guys....got a strange problem....just put new plugs in my 01 740i, new air filter, and i have a rough idle....revving the engine to about 13-1500 rpms i have a vibration....had it scaned, no codes. Plugs are NGK. I added a can of BG44k and it seemed to be better for a little while but is rough again....had this problem for a while and noticed no change in gas mileage but now it is down from 18 CITY to about 14-15. Does this sound like it could be an injector? Will 02 sensors cause this? Out on the highway car seems to be smooth, but under a stress climbing a hill it seems to be a bit worse at around 45-50. I don't have any codes and the scans revealed NOTHING! YOUR THOUGHTS PLEASE??? THANKS FO MUCH FOR YOUR INPUT!
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  #2  
Old 02-27-2013, 01:55 AM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 1,908
Mein Auto: E23;E30;E38;E32;E34 +
Rig injector clean and change fuel filter. Then we will go on from there.
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  #3  
Old 02-27-2013, 10:45 AM
Danny Wolfe Danny Wolfe is offline
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Location: USA
 
Join Date: Feb 2011
Posts: 88
Mein Auto: 2001 740i
RIG INJECTOR?? What does that mean? I am going to change the fuel filter this weekend....will let you know. How do you check the injectors or know if they are bad??? THANKS VERY MUCH!
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  #4  
Old 02-27-2013, 09:16 PM
Danny Wolfe Danny Wolfe is offline
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Location: USA
 
Join Date: Feb 2011
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Mein Auto: 2001 740i
BUT will injectors, fuel filters, or 02 sensors cause a reduction in gas mileage?
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