Hello all. I've seen numerous concerns here on the forums about people experiencing rough engine start/knocking noise at startup. I personally haven't experienced it nor have we had any customers here inform us about it. If mine does start doing it or if we get a local complaint we are going to try our best to get to the bottom of it and find a fix. On June 9th, 2010 Toyota released T-SB-0146-10. The TSB description is as follows: Immediately following a cold soak startup, some 2009 â€“ 2011 model year vehicles equipped with the 1AR-FE and 2AR-FE engines may exhibit a brief knock/rattle noise from the engine compartment forapproximately one second. I understand this isn't exactly what folks here are describing but it is very similar in nature. The fix you ask? A revised VVT-i cam gear. This sounds like a very possible lead for our 2ZR-FXE's. So, for those of you experiencing this, make it noted at your dealer. Ask them to submit a DPR (Dealer Product Report), this is how we get TSB's and other SSC's. After all, DPR's from complaints of the braking lag is how you all got SSC AoB, so they do work. Just thought I would let you all in on this info.