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08-13-2004 05:24 AM #1
Fuel Trim Malfunction (Bank 2) '98 740i
My car is starting rough when it sits for a while, either overnight or after a vacation where it has been sitting in the garage.
The fault code says that there is a "Fuel Trim Malfunction (Bank2). Any thoughts of what might cause this? I recently replaced the fuel filter and noticed some (small) cracks in the line connectiing the fliter.
Thanks for any guidance that you might be able to give me to rectify this issue.
'98 740i Blue w/ Grey
02-09-2005 02:05 AM #2
Re: Fuel Trim Malfunction (Bank 2) '98 740i
i have the same problem with my 2001 mercedes c240. when i scanned my car the same exact malfunction came up. the thing that makes me wonder is that i also just recently changed my fuel filter also. i haven't yet bought the "chilton's" book on this car, so i haven't had a chance to further investigate the matter, but my car is idling very rough. let me know if you have some information that i don't. thanks, and good luck.
03-11-2005 09:15 AM #3
03-13-2005 02:02 PM #4
03-14-2005 07:26 PM #5
12-14-2005 09:45 AM #6
Re: Fuel Trim Malfunction (Bank 1 and 2) '98 740i
Codes reveal that there are multiple missfires and bank 1 and bank 2 fuel trim problems.
I have replaced the fuel filter, fuel pump, and the rear intake plate and gasket (did not remove the intake manifold). This car still runs smoothly except when cold but even then it runs okay. If there is an air leak it would seem that it would have to be at either the rear of the intaked manifold or the front since both banks are involved. The MAF may be suspect but not sure how to check it. The other thing that has occured since installing the new fuel pump is a strong gas ordor that seems to be coming from the engine compartment. A visual inspection does not detect any noticable leakage. Any help will be welcomed.
07-21-2007 02:36 PM #7
03-02-2009 10:26 PM #8
03-10-2010 05:21 PM #9
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