NHTSA Complaint #10436501 — 2007 TOYOTA SIENNA

ENGINE/POWERTRAIN HESITATES FOR 1-3 SECONDS WHEN ACCELERATING SLOWLY, OR ACCELERATING QUICKLY AFTER SLOWING DOWN SUCH AS WHEN SLOWING DOWN IN AN INTERSECTION, MAKING A TURN, OR IN SLOW TRAFFIC. ENGINE HAS PISTON SLAP FOR 3-5 MINUTES AFTER A COLD START IN WEATHER BELOW 40 F. THE SLAP BECOMES LOUDER WITH COLDER TEMPS. SHIFTING INTO GEAR WITH A COLD ENGINE CAN CAUSE THE VEHICLE TO LURCH DUE TO HIGH IDLE. DRIVER MUST HAVE FOOT FIRMLY ON BRAKE BEFORE SHIFTING INTO GEAR. PROBLEM DIMINISHES IF ENGINE IS ALLOWED TO WARM FOR 45-60 SECONDS. WHEN PARKING, THE DRIVER MUST KEEP THE BRAKE FULLY DEPRESSED, SHIFT INTO PARK, PAUSE 1-2 SECONDS BEFORE RELEASING BRAKE. IT SEEMS THERE IS A BRIEF DELAY BETWEEN GEAR LEVER BEING PLACED INTO PARK, AND POWERTRAIN ACTUALLY GOING INTO NEURAL/PARK POSITION. RELEASING THE BRAKE TOO SOON WILL ALLOW VEHICLE TO ROLL AHEAD 3-6 INCHES. *TR