Join Date: Mar 2011
Location: Mid Hudson Valley, NY (USA)
Re: 2017 Sienna poor performance (vs 2013)
Mechanical throttles are very linear. Move the gas pedal a half inch, and the throttle plate moves 15 degrees. Push it another half inch, you get another 15 degrees.
An electronic throttle can be anything the software guy wants it to be.
Some can be manipulated thru an interface like Techstream. A guy over on the Subaru board reported that he remapped his throttle to get rid of some of the jumpiness off the line, and improve midrange response.
Other throttles are self learning. Repeatedly push hard and over time the system might be capable of learning that you want to do an 'aircraft carrier catapult' launch from stop signs. Tickle it all the time, and the system will learn to advance thru the gears earlier to aid fuel economy. All I can say is try different modes of driving and report back if you see any improvement.
Current: '15 Sienna Limited Premium (FWD), '14 Subaru Outback, '13 Honda CRV AWD.
Past: '08 Sienna LE (FWD), '02 Subaru Outback, '02 Honda Odyssey EX