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Hi,

I have a 2007 Mazdaspeed3. I am having and issue where the engine sounds like it is knocking at ~2000 rpm and up. However, when I get into boost the knocking goes away. Note: there is not knock at idle. I know one of the engine mounts has or is about to go out. I know from my previous mazda3 that the ping sensor is extremely sensitive to worn engine mounts but I am unsure if that is the case here.
I have checked the spark plugs (brand new; <1000mi), and the outer two cylinders seem to be running extremely rich while the inner two seem to be running on the lean side. At idle the car sounds normal. I have driven it and it seems to pull just fine outside of the odd sounds that the engine is making. Any help or pointers would be greatly appreciated. Thank you.
 
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