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The BMW Range
5 Series
E39
Need Review from E39 SIFU'S for this 520i-2003 E39
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<blockquote data-quote="alantiong" data-source="post: 686465" data-attributes="member: 19754"><p>i have came across a lot of E39s, m52,m54 lost so much of power due to a rotten cat, and leaky oily engines. i cannot actually explain why the leaky oily gaskets will cause power lost but i believe it has something to do with the ccv's. once you have leaky gaskets, when you take off the oil cap, there is no vacuum feeling into the engine. when u have a not efficient ccv, you get the same feeling.</p><p></p><p>for car this age, if possible, de-cat. the restriction from the rotten cat is so so bad. lose at least 20-30Nm in torque.</p></blockquote><p></p>
[QUOTE="alantiong, post: 686465, member: 19754"] i have came across a lot of E39s, m52,m54 lost so much of power due to a rotten cat, and leaky oily engines. i cannot actually explain why the leaky oily gaskets will cause power lost but i believe it has something to do with the ccv's. once you have leaky gaskets, when you take off the oil cap, there is no vacuum feeling into the engine. when u have a not efficient ccv, you get the same feeling. for car this age, if possible, de-cat. the restriction from the rotten cat is so so bad. lose at least 20-30Nm in torque. [/QUOTE]
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Need Review from E39 SIFU'S for this 520i-2003 E39
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