1990 Toyota Supra Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1990 Toyota Supra


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.

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.

It is important to regularly check the valve clearance as the exhaust valves may become too tight. This will lead to valve failures which are expensive to repair.

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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

did a complete tune runs good at idle,now right at 2000 rpm's it cuts on and off,you can slow it dowm and it will rev higher but it won;t hold.why does it pulse back and forth ?

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