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1991 Toyota Supra Problems

Find the most common issues based on 1991 Toyota Supra owner complaints.
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Most Common 1991 Toyota Supra Problems

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 temperat...
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 b...
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 ...
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1 Known 1991 Toyota Supra Brakes Problem

As the size of the Supra vehicle gets ever larger, there is a tendency to warp the front rotors. This will be felt as a shudder in the steering wheel when braking. The front rotors can be remachine...

1 Known 1991 Toyota Supra Drive Train Problem

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 b...

1 Known 1991 Toyota Supra Electrical & Lights Problem

If the vehicle will not crank over, the most common problem is the starter, which tend to fail at about 100,00-125,000 miles. Sometimes it is only the starter solenoid contacts, but often the compl...

4 Known 1991 Toyota Supra Engine Problems

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.
The 1986-1992 Toyota Supra and Toyota Supra Turbo used an asbestos type head gasket which commonly fails. Symptoms of a blown head gasket include: -Start and stall, or no start condition -Rough i...
The 1986-1992 Toyota Supra and Toyota Supra Turbo used an asbestos type head gasket which commonly fails. Symptoms of a blown head gasket include: -Start and stall, or no start condition -Rough i...

2 Known 1991 Toyota Supra Exhaust & Emissions Problems

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 temperat...
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 ...

2 Known 1991 Toyota Supra Heating & Air Conditioning Problems

Usually by 150,000 miles the AC system will need some attention, especially in climates where it is used often. Our technicians tell us that it is best to service the AC system every 2-3 years. T...
The Toyota Supra and Supra Turbo from 1986-1992 (MKIII) is known to leak engine coolant and overheat due to a leaky heater control valve. Drivers will notice a decrease in heater performance, and i...

2 Known 1991 Toyota Supra Maintenance Problems

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 ...
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.

2 Known 1991 Toyota Supra Miscellaneous Problems

Our technicians report that by 100,000 miles, the ignition key tends to wear out and should be replaced or it may not work as well in the door locks or ignition lock cylinder.
The third-generation (MKIII) Toyota Supra has a common problem with the rear hatch leaking water into the vehicle. Through normal operation, dirt, leaves, or twigs will build up between the hatch ...

1 Known 1991 Toyota Supra Suspension & Steering Problem

The power steering pump and power steering hoses tend to develop leaks and may require replacement.

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Known 1991 Toyota Supra Problems & Complaints

Usually by 150,000 miles the AC system will need some attention, especially in climates where it is used often. Our technicians tell us that it is best to service the AC system every 2-3 years. T...
Our technicians report that by 100,000 miles, the ignition key tends to wear out and should be replaced or it may not work as well in the door locks or ignition lock cylinder.
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 ...
If the vehicle will not crank over, the most common problem is the starter, which tend to fail at about 100,00-125,000 miles. Sometimes it is only the starter solenoid contacts, but often the compl...
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 b...
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 temperat...
Brake fluid can become dirty and may cause problems in the brake system; it should be flushed every 60,000 miles.
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.
The Toyota Supra and Supra Turbo from 1986-1992 (MKIII) is known to leak engine coolant and overheat due to a leaky heater control valve. Drivers will notice a decrease in heater performance, and i...
The third-generation (MKIII) Toyota Supra has a common problem with the rear hatch leaking water into the vehicle. Through normal operation, dirt, leaves, or twigs will build up between the hatch ...
The 1986-1992 Toyota Supra and Toyota Supra Turbo may lose power, fuel economy, and possibly have black smoke from the tail pipe due to a known issue with the knock sensor and/or knock sensor wirin...
The 1986-1992 Toyota Supra and Toyota Supra Turbo used an asbestos type head gasket which commonly fails. Symptoms of a blown head gasket include: -Start and stall, or no start condition -Rough i...
The 1986-1992 Toyota Supra and Toyota Supra Turbo used an asbestos type head gasket which commonly fails. Symptoms of a blown head gasket include: -Start and stall, or no start condition -Rough i...
The power steering pump and power steering hoses tend to develop leaks and may require replacement.
As the size of the Supra vehicle gets ever larger, there is a tendency to warp the front rotors. This will be felt as a shudder in the steering wheel when braking. The front rotors can be remachine...
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