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Originally Posted by srhorn
My '04 X3 2.5 started getting terrible mileage (15-16 city, 19-21 highway)...the dealer said everything was fine. With some research I found some posts regarding the seals in the Vanos unit. Well I did the seals and Voila, the car is getting good gas mileage again (19-21 city, 24-29 highway)!
The Vanos seal issue was resolved in the latest engine redesign ('06?) but was in all the dual vanos engines berfore then.
Steve
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Thats great info Steve! Care to elaborate, how'd you narrow it down as the vanos causing the poor consumption?
Was it noisy during start up? Or was it the slight sputtering/vibration , like foul plugs during warm up/start up?- which I notice every now and then on ours.
I wonder if there is a TSB on this?
hmmmm.....
Beisan Systems