1990 Toyota Supra Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Toyota Supra
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1990 Toyota Supra ProblemsCheck Engine Light Due to Restricted 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.
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.
Our technicians tell us that it is important to change the coolant with factory coolant and replace the thermostat every 60,000 miles. This will help to protect the head gasket, otherwise the head gasket can deteriorate and be stressed to the point of failure.
1990 Toyota Supra QuestionsMy supra keeps turning off when I go in neutral. What could be the issue? (1 answer)
I've changed the ignition coil, added my fluid to the clutch. Change a battery terminal. And in a few weeks, I'm gonna clean the intake. It was working fine after all this but it continued to shut down
Just replaced the engine that was working great in another Supra of the same make and model.
My car is leaking radiator fluid from a hose that is connected to the back of my engine block near the head gasket and I'm unable to find the name of the part I need online