1991 Toyota MR2 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1991 Toyota MR2
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1991 Toyota MR2 ProblemsAutomatic Transmission May Not Shift Correctly at High Mileages
At higher mileages, (125,000-150,000) the automatic transmission may not shift correctly. This can be caused by the throttle position sensor being out of adjustment or a shift solenoid needing to be replaced. Typically the transmission does not need to be completely overhauled.
Over the time the exhaust gas recirculation (EGR) system may become plugged with debris, the oxygen sensor may also be getting slow or 'lazy' around this time. When servicing or cleaning the EGR system, it is a good idea to replace the oxygen sensor because it works in tandem with the EGR system.
The EGR System tends to get restricted or blocked with carbon after 100,000- 125,000 miles which will cause an emissions test failure for NOX. If the EGR system is equipped with an EGR temperature sensor it will trigger a Check Engine Light for improper EGR flow. The repair is to clean out the EGR passages and the EGR Temperature sensor. Our technicians tell this repair is pretty straight forward and takes about 1-1.5 hours. It is also wise to verify the EGR system components i.e. the Transducer, EGR Valve and VSV Solenoid at this time.
1991 Toyota MR2 Questionsmy mr2 is having a stalling problem starts and run but stalls when put into gear (2 answers)
not sure what it could be I have replaced the throttle position sensor, EGR vacuum solenoid, plugs and wires, transmission shift solenoids, distributor cap and rotor button, coil pack ,flushed and clean engine and tranny inside and out , and still having the same problem . the car starts and runs...
if hold throttle to stop it stalling when warmed up its perfect
I just perched a new Mr2 i put a jdm ECU in but didn't start so i put the original ECU back and it started up but then it died when i gave a little burst of gas. so i checked the alternator and it was bad. I replaced it and started her up went around the block and it died at the first stop si...