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The BMW Range
3 Series
E46
ECU Malfunction
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<blockquote data-quote="Mtigo" data-source="post: 680258" data-attributes="member: 3952"><p>Start with easy stuff first than think about your faulty ECU</p><p></p><p>1) Check main air tube leading from MAF to throttle body and ICV, the little elbow will often crack with age and let air get in, causing your issue. also not forget check all your vacuum lines as well as your PCV valve, as it seems to be the one of the causes of our e46's mis-firing. (the escaped air causes the o2 sensors to get faulty readings, causing the engine to misfire due to the inaccurate reading.) </p><p> </p><p>2) Fuel delivery "could" be an issue. Try replaced fuel filter. </p><p></p><p>3) Cam sensor.</p><p></p><p>Good luck!</p></blockquote><p></p>
[QUOTE="Mtigo, post: 680258, member: 3952"] Start with easy stuff first than think about your faulty ECU 1) Check main air tube leading from MAF to throttle body and ICV, the little elbow will often crack with age and let air get in, causing your issue. also not forget check all your vacuum lines as well as your PCV valve, as it seems to be the one of the causes of our e46's mis-firing. (the escaped air causes the o2 sensors to get faulty readings, causing the engine to misfire due to the inaccurate reading.) 2) Fuel delivery "could" be an issue. Try replaced fuel filter. 3) Cam sensor. Good luck! [/QUOTE]
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