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The BMW Range
3 Series
E46
Need expert avdice .....
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<blockquote data-quote="jarance" data-source="post: 440792" data-attributes="member: 21"><p>MAF = Mass Air Flow meter</p><p>AFM = Air flow meter</p><p></p><p>Usually E46 used MAF whereas E36 use AFM. However, some E46 still use M43 engine so may still use AFM.</p><p></p><p>AFM and MAF both measure the air volume flowing into the throttle body. MAF use two wires heated up to ense the air flow whereas AFM use vane to detect the flow.</p><p></p><p>AFM have a tendency to be sticked up at fully open position. When it is fully open, it give the wrong signal to the ECU and hence will cause idling speed problem. Similarly, MAF have a tendency to get coated with dirt and cause the reading to be in-accurate which also cause the idling speed problem.</p><p></p><p>If you have low power at low rpm, chances could be the following:-</p><p>1. chocked fuel fuel filter.</p><p>2. faulty pump.</p><p>3. faulty plugs</p><p>4. O2 sensors</p><p></p><p>There are many things affected fuel consumption. If you can listed up what you have done, maybe we can shortlist the likely cause.</p></blockquote><p></p>
[QUOTE="jarance, post: 440792, member: 21"] MAF = Mass Air Flow meter AFM = Air flow meter Usually E46 used MAF whereas E36 use AFM. However, some E46 still use M43 engine so may still use AFM. AFM and MAF both measure the air volume flowing into the throttle body. MAF use two wires heated up to ense the air flow whereas AFM use vane to detect the flow. AFM have a tendency to be sticked up at fully open position. When it is fully open, it give the wrong signal to the ECU and hence will cause idling speed problem. Similarly, MAF have a tendency to get coated with dirt and cause the reading to be in-accurate which also cause the idling speed problem. If you have low power at low rpm, chances could be the following:- 1. chocked fuel fuel filter. 2. faulty pump. 3. faulty plugs 4. O2 sensors There are many things affected fuel consumption. If you can listed up what you have done, maybe we can shortlist the likely cause. [/QUOTE]
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