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The BMW Range
5 Series
E39
Lost of RPM while driving
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<blockquote data-quote="pussy" data-source="post: 654164" data-attributes="member: 60"><p>simple solution, the gearbox hasn't got a problem, once the rpm drops below a certain rpm, the alternator charging is lesser than the 14.2v hence the gearbox ecu will not get proper voltage to it, hence the 'trans fail signal' will pop up. i had it on my car when my battery was not charging properly due to the alternator. i do get it some times cos i have yet to change it...</p><p></p><p>In that case, do check why your rpm dips, air leak ?</p></blockquote><p></p>
[QUOTE="pussy, post: 654164, member: 60"] simple solution, the gearbox hasn't got a problem, once the rpm drops below a certain rpm, the alternator charging is lesser than the 14.2v hence the gearbox ecu will not get proper voltage to it, hence the 'trans fail signal' will pop up. i had it on my car when my battery was not charging properly due to the alternator. i do get it some times cos i have yet to change it... In that case, do check why your rpm dips, air leak ? [/QUOTE]
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Lost of RPM while driving
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