Knock Sensor records at 4000 rpm, in drive

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2002 Mazda Protege 5
Hi,

2005 Mazda SP23

Has anyone used Mazda OBD Software and tested the knock sensor in drive at higher rpms?

I have a situation that my Knock sensor trips at 4000 and the timing, of course, retards to adjust. I have checked, spark plugs coils, motor mounts, loose objects banging against block, PCM s/w current, carbon build up is clear...Mazda dealer says they can't find anything. I use 89 octane. The airbox resonator is taken off but no other mods to the engine.

Appreciate the help.
 
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