Bump!
I don't receive any error codes, also the Engine light does not come on either, there is a noticeably loud/difference on my drivers side exhaust as if its backfiring (but its not) just sounds like it from the exhaust, I was thinking maybe if it could be a bent valve? since its only coming from the one side (bank 1-4) exhaust?

As discussed in the post I changed the timing chain guides, I had to drive/role the car off the grass out the front into the garage as the cars engine was rattling because of the timing chain guides?

Any other possibilities?
The car runs perfect other than that^