1990 Toyota Supra Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1990 Toyota Supra
Verified by mechanics, reported by drivers like you
Ask a mechanic in our community
Never overpay. Check prices with our estimator
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.
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.
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.
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