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Message: <blockquote data-quote="dungbtle" data-source="post: 8987" data-attributes="member: 4287"><p>hi all, i'm currently driving a (e30)m20b20 L-jet , and petrol consumption after some comparisons shows that mine is exorbitantly high, like 20liter/100km or so.   so i sat down and meditate with my  very little knowledge of cars, wondering why. i' smell bad petrol fumes coming out from my exhaust , and my stainless steel  exhaust tip turns yellow within 2 days everytime i polish it.    is the staining a cause of overly rich mixture or petroL?  if it is, isit possible for me myself to tune anywhere?  cos back when i was having my volks, i could just tune the air and petrol intake with a screw driver ...i know lar that one is carburetor.. .  well,  cos one of the forummers told me that L_jets are tunable without the electronical gadgets. thanks for sharing guys.cheers</p></blockquote><p></p>