Quote:
Originally Posted by mechman600
Simply create a manifold vacuum leak to the air box. That way the throttle angle will always be less at a given load than it normally would be and the transmission won't kick down as soon.
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As
Christ said, it'd have to be trial and error with a valve. I'd likely see P0121 and P0221 codes if I caused too large of a vacuum leak. The engine computer compares throttle sensor positions against manifold air pressure sensor readings, and the throttle itself is one of them drive-by-wire types (not like in the Dakota, where I could spoof the throttle position as needed).