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Originally Posted by insite
okay, i hit it with a code reader today......no codes. another oddity is that even though i'm using the RoW program which should only monitor two O2 sensors, i'm getting readings from all four.....
so, here are some numbers at idle:
MAF: 0.95
Ign Adv: 12deg
Fuel Sys 1 & 2: closed
ST Ftrm 11: -11.7%
ST Ftrm 21: 9.4%
the symptoms are a lumpy idle and a very fuel-rich exhaust with some smoke. from the numbers above, it seems that one bank is rich & one is lean.....
i will work on prepping a diagnostic plan tomorrow. in the meantime, any ideas are welcome! as a first order of business, i will check to see if the small oil leak from the area of the #1 spark plug tube is somehow related.
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Insite:
I know that you have dealt with the common issue of the correct volume/velocity of the air intake as affected by the diameter of the intake housing/tubing by installing the BMW 540i MAF housing and the associated silicone tubing, but are you sure that all of that is correct and that there are no air leaks anywhere in the tubing connections?
Also, is it possible that the DME has to learn the values by going through the various cycles, as it does when you disconnect the battery for a while and the DME has to relearn the correct fuel trims, etc.? And that may one of the causes for the lumpy idle?
Regards, Maurice.