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Old 01-20-2013, 10:08 AM   #5
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Join Date: Feb 2008
Location: Philadelphia
Posts: 6,919
My Ride: M3 & ZHP
Originally Posted by flashmeow View Post
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!
My ZHP exhibited the problem long after replacing the DISA with a brand new one. The DISA doesn't even open up until 4000 RPM, so I seriously doubt it's the cause of this particular issue (it probably did contribute to the infamous 4000RPM dip however). Software update was what finally fixed it

Last edited by TerraPhantm; 01-20-2013 at 10:10 AM.
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