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2004 BMW 325Ci

Question: Car shakes while driving

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jmonicab, Nashville, TN, June 02, 2010, 11:06
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 Rookie

I just had my crankcase ventilation system replaced (e.g., hoses, valves, etc) on my 2004 325Ci (BMW) as it was getting a "lean" code. However, my car still shakes periodically when I drive it at either lower or higher speeds. What could this be about?

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  • Answer #1

    dandd June 04, 2010, 12:42
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     Master

    Does the Check Engine Light still come on? if there are still lean codes, then the real reason for the lean condition was not addressed. Look at this paper I wrote about lean codes, I do Emissions work in CA and I deal with this a lot. An under reporting Mass Air Flow Sensor is very, very common on most German cars, especially BMW and MB.

    http://repairpal.com/OBD-II-Code-P0171-and-P0174

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    Visitor, June 04, 2010, 13:03

    Thank you for the response! The Check Engine Light is no longer on. From your report and others, I'm wondering if it's a misfire issue. Thanks again for your help.

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