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Old 01-20-2013, 10:48 AM   #3
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Join Date: Apr 2008
Location: Dallas, TX
Posts: 2,217
My Ride: E30-E46-E90-E90M-F30
The problem for the ZHP "stutter problem" was two main issues: DISA and KNOCK SENSOR.

The older DISA would make a loud noise when the DISA flap gets activated. As a result, the knock sensor would retard the timing because it thinks there was actual engine knock. the solution that BMW came out with was to update the DME and to release a different DISA.

I hope this helps. good luck!
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