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The BMW Range
5 Series
E39
E39 engine mis-firing
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<blockquote data-quote="zidee" data-source="post: 591066" data-attributes="member: 20151"><p>Raymond has changed a typical parts that cause the engine to vibrate. I believe it happen especially during morning start. There are 4 O2 sensors. 2 Pre Cat and 2 post Cat. Diagnostic should be able to tell condition of the O2 sensors and which position and bank require change. Bear in mind, the sensors has the lifetime. O2 sensors easy to change. I bought from eBay and DIY.</p><p></p><p>I always tackle the problem using the cheapest and best guest first after diagnostic plugged in. Last will be the toughest and slight expensive fix which is vacuum leak issue as manifold need to be removed to access the hoses and the oil separator/Crankcase Ventilation/CCV. Beside replacing the CCV, best is to changed all the 3 hoses as well to save labour cost in future. all the items changes are consider wear and tear items so don't be despair if it still does not solve the problem for now.</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="zidee, post: 591066, member: 20151"] Raymond has changed a typical parts that cause the engine to vibrate. I believe it happen especially during morning start. There are 4 O2 sensors. 2 Pre Cat and 2 post Cat. Diagnostic should be able to tell condition of the O2 sensors and which position and bank require change. Bear in mind, the sensors has the lifetime. O2 sensors easy to change. I bought from eBay and DIY. I always tackle the problem using the cheapest and best guest first after diagnostic plugged in. Last will be the toughest and slight expensive fix which is vacuum leak issue as manifold need to be removed to access the hoses and the oil separator/Crankcase Ventilation/CCV. Beside replacing the CCV, best is to changed all the 3 hoses as well to save labour cost in future. all the items changes are consider wear and tear items so don't be despair if it still does not solve the problem for now. Good luck. [/QUOTE]
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