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The BMW Range
5 Series
E39
525i d.vanos misfiring need advice from sifus...
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<blockquote data-quote="alantiong" data-source="post: 696592" data-attributes="member: 19754"><p>there is no connection between misfiring and cylinder head. if you have a blown gasket.. you would blown the s@#! out when you did a 5500rpm. so save your money.</p><p></p><p>there is only two things to misfiring. Fuel and Spark. now.. read carefully</p><p></p><p>lets start with fuel. after your 5500 run. open up the spark plugs. is it dry or wet? </p><p></p><p>if it is dry. you might have starvation. then check fuel line, pressure fuel filter blah blah blah... </p><p></p><p>if it is wet... yo have no spark. zoom down to electrical. how are the coils? check all wiring towards the coils. it is not unusual for some cracked wiring causing misfiring at high rpm. i had that before. </p><p></p><p>from what i gather.. my money is on electrical. i would look closely at the coils and surrounding aux wiring</p></blockquote><p></p>
[QUOTE="alantiong, post: 696592, member: 19754"] there is no connection between misfiring and cylinder head. if you have a blown gasket.. you would blown the s@#! out when you did a 5500rpm. so save your money. there is only two things to misfiring. Fuel and Spark. now.. read carefully lets start with fuel. after your 5500 run. open up the spark plugs. is it dry or wet? if it is dry. you might have starvation. then check fuel line, pressure fuel filter blah blah blah... if it is wet... yo have no spark. zoom down to electrical. how are the coils? check all wiring towards the coils. it is not unusual for some cracked wiring causing misfiring at high rpm. i had that before. from what i gather.. my money is on electrical. i would look closely at the coils and surrounding aux wiring [/QUOTE]
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525i d.vanos misfiring need advice from sifus...
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