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      09-19-2015, 03:08 PM   #23
djlogan33
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I was in shock how powerful the engine felt after the new VANOS was installed.
Before the repair, I felt power at intial take-off and at top-end and mid-range was sort-of flat.
Now the engine pulls strong from take-off to top-end.
It's a joy to drive again.
Apparently the VANOS was not working properly for a long time maybe before the warning light was going on and off.
I still do not understand why the warning light would come on and off regularly.
I was told the problem with the VANOS-UNIT was that one of the pistons inside the unit was occasionally sticking.

I don't remember it running this good when I bought ot at 22,000 miles... so there may have been some wrong with the VANOS-UNIT when I first bought it.

I had a Z3 M Coupe with a S54 engine years ago and can't remember how it felt... but because I replaced the factory 3.15 diff with a 3.75 diff, it's power delivery felt much different than my current Z4 M Coupe.

Bottom line... I'm happy with how the engine is responding now....
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      09-21-2015, 03:30 PM   #24
elerner61
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From your experience, do you think periodic cleaning of the Vanos solenoid valves (as in this Beisan DIY) would make sense? http://www.beisansystems.com/procedu..._procedure.htm

It looks like it would be an hour or less to do and relatively risk free. I've been having a new Vanos filter and sealing plate installed whenever I have the valves done, but nothing else.

Thoughts on this?
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      09-26-2015, 12:14 AM   #25
nutzkicker617
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I did this not too long ago:

http://www.zpost.com/forums/showthread.php?t=1022927
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      09-29-2015, 08:46 AM   #26
Zyal8r
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There are some vanos recalls out there. Check with the CCA. I read somewhere that the warranty was increased also.
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