7even

have a 'built' f20, supercharged running on aem infinity.
I've just replaced my tired Ballade motor mounts with Innovative Race Mounts using a much higher durometer rating (85A). not solid though.
the very next time the car was started the motor acted as if it had limited fuel or only 2-3 cylinders. 6-8 seconds later it 'snapped out of it' as the AEM began its 'O2' idle sequence.
however, the car ran rough around town under harder acceleration, and totally choked under 75-85% throttle.

Anyone suspect this could be Knock Sensor related?

I have read a couple of threads in the past with people developing an issue like this who happened to have race mounts but have not seen an instance where the issue follwed immediately after the mount install. This makes me think that is definitely the issue, but wanted get experience/inout before diving in too deep.

If it was a knock issue, what options for a solution do i have?

flanders

If it is knock related it should be easy to check in the AEM software, as a temporary test you could just disable the knock sensor.
I'm not that familiar with the AEM software but I'm sure there are others here that could walk you through it if you are unsure.

7even

i was under the impression that if i unplug the sensor i would create additional issues. or get code/warning on aem

starchland

Which hardware was used?

7even

to what are you referring?

flanders

Yes unplugging might cause problems, I was thinking disable it in the software.

starchland

for motor mount install, engine side

flanders

Good point^
If you were using wrong bolts for the engine side mount you will punch a hole through to the engine block.

windhund116

7even

implying my block could be cracked?
That is not the problem