Does the speedometer still work? The electronic speed signal is generated by the speedometer, without it the ecu and ect do not know what speed the car is moving.
The shifting at 4500 RPM's reminds me of my first Supra. After it overheated (which ruined the engine and caused me to replace it with a JDM engine), the car would not shift below that same engine speed, regardless of amount of throttle. My car also would not downshift properly. The cause turned out to be 2 seperate problems: I had a melted throttle position sensor (from overheating), and an improperly adjusted transmission kick down cable. I would recommend checking both the tps and kickdown cable for proper function and calibration (see the tsrm, you can find a link in the "Helpful Supra Websites" thread in the MKIII FAQ forum).
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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