Quote:
Originally Posted by X5Cat
Read a few articles & watched a few youtubes on the VANOS. Sounds like an interesting avenue to explore, and I would like to get some readings.
Sounds like the VANOS is especially sensitive to oil viscosity. I admit I am way behind on my oil change schedule, and I could see that possibly affecting it. Yes, I know, I know. But, I was in an awful accident last year, spent a week in the hospital, and literally almost died. Thank God I didn't, but I got behind on a lot of things and I'm still trying to catch up. I do run Castrol Titanium 5W30 full synthetic though, and normally change annually or at 20K. It's been way over a year but the wife really doesn't put that many miles on it, so I really haven't been that concerned about it.
Give me my reprimand about the oil, and no doubt I need to go ahead and refresh it and the filter, but I do have a little trouble imagining that the VANOS would affect only Bank 2.
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whoa dude.
20k? Thats nuts.
So vanos isnt so sensitive to viscosity...but crap in the oil, sludging up the screens in the vanos actuators WILL impact their motion. This causes the valve advance to be 'sloppy'. The DME is commanding one range, and ithe motor actually doesnt achieve that range fully or quickly. It doenst trip vanos codes, but it means the AFR will be off during those periods when the vanos is lagging or a bit off. Since the AFR is a long term adaptation, you get a persistent error (ie rich, lean) which is usually subcritical BUT affects cats, performance, throttle response.
Remind me, does your motor have two banks of vanos or one? My M5 has two, which is where I have all my vanos exposure. (My x5 is a D)