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      04-30-2009, 12:55 PM   #9
ENINTY
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Drives: 2006 325i Sport
Join Date: Jun 2006
Location: Virginia

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The modern day engine has a computer controlled combustion process, with O2 sensors and knock sensors. If the engine were to start running lean the ECU would send it into limp mode to avoid internal damage because of a lean condition.

I was looking around on the BMW TIS site a few weeks ago and found a procedure to add an external fuel filter to the E90 fuel system. I haven't seen the part anywhere on any BMW parts websites, but the additional fuel filter is meant for places in the world where the fuel quality is questionable (the part may not be on the US parts list). If you are concerned about the fuel filtering process on the E90, you may want to look into adding the auxillary fuel filter to your car. The procedure was pretty straight forward. Remove the rear seat. Open the access cover to the fuel tank (it's there to facilitate a fuel pump replacement). Remove one fuel line and replace it with the auxillary fuel filter.
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