What are the most common Toyota Supra problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 1998 Toyota Supra has 9 documented issues. The most frequently reported are: Sequential Twin-Turbo System Failure (VSV/Actuator Faults, #1 Turbo Seal Wear), A340E Automatic Torque Converter Shudder and Lockup Problems, Aging OEM Fuel Pump Losing Pressure and Flow. Of these, 1 is rated critical and should be addressed promptly.
Is the Toyota Supra reliable?
The 1998 Toyota Supra has 9 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: Sequential Twin-Turbo System Failure (VSV/Actuator Faults, #1 Turbo Seal Wear). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Toyota Supra problems?
Repair costs for known Toyota Supra issues range from $50 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Sequential Twin-Turbo System Failure (VSV/Actuator Faults, #1 Turbo Seal Wear), typically costs $200-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 1993-1998 Toyota Supra Sequential Twin-Turbo System Failure (VSV/Actuator Faults, #1 Turbo Seal Wear)?
The 2JZ-GTE's factory sequential twin-turbo system relies on a network of vacuum switching valves (VSVs), pressure tank, and actuators (EGCV, IACV, exhaust gas bypass) to bring the second CT12B turbo online around 4,000 RPM. With age, VSVs fail, vacuum lines crack, and actuators… Repairs typically run $200-$3,500. Severity: high.
What is the 1993-1998 Toyota Supra A340E Automatic Torque Converter Shudder and Lockup Problems?
Automatic MKIVs use the Aisin A340E, whose relatively small lockup clutch is prone to shudder during partial and full lockup engagement, typically felt as a vibration at light-throttle cruise. The most common causes on these cars are aged or incorrect fluid — the TT A340E's flex-… Repairs typically run $150-$2,500. Severity: medium.
What is the 1993-1998 Toyota Supra Aging OEM Fuel Pump Losing Pressure and Flow?
The original in-tank Denso fuel pump wears with age and mileage — brushes, commutator, and pump vanes degrade — so output drops below the pump's original rating. Flow testing documented on MKIV.com showed measurably reduced output from older stock pumps, and on turbo cars a tired… Repairs typically run $150-$500. Severity: medium.
What is the 1993-1998 Toyota Supra Getrag V160 6-Speed Synchro Wear (3rd Gear Grind)?
Turbo models with the Getrag V160 6-speed commonly develop worn synchronizer rings, with 3rd gear typically the first to grind during fast or cold shifts. The gearbox itself is extremely strong, but a worn or dragging clutch accelerates synchro wear, and V160 internal parts are r… Repairs typically run $1,500-$5,000. Severity: medium.
What is the 1993-1998 Toyota Supra Heater Core Leaks Requiring Full Dash Removal?
Aging heater cores and their o-ring pipe connections leak coolant into the cabin, producing a sweet coolant smell, fogged windshield, and damp passenger-side carpet. The part itself is cheap, but on the MKIV the heater core sits behind the full dashboard, and owners widely descri… Repairs typically run $100-$1,500. Severity: medium.
What is the 1993-1998 Toyota Supra Factory Radiator Plastic End-Tank Cracking?
The original radiator uses crimped plastic end tanks on an aluminum core, and after two-plus decades the plastic becomes brittle and develops hairline cracks, typically along the upper tank. Cracks often only open under pressure when the engine is hot, so the leak shows up as coo… Repairs typically run $200-$700. Severity: medium.
What is the 1993-1998 Toyota Supra Targa Roof Water Leaks and Rattles?
Sport Roof (targa) cars commonly leak water down the A-pillars and along the tops of the door glass, and develop an annoying chatter/rattle from the roof panel over bumps. Causes are aged/compressed targa weatherstrips, clogged or dirty drip rails, loosened targa latch bolts, and… Repairs typically run $50-$600. Severity: low.
What is the 1993-1998 Toyota Supra Brittle Interior Plastics and Trim Cracking?
After 25-plus years, MKIV interior plastics — door panel tops, trim clips, plastic gaskets, and the foam backing behind the vinyl door panels — become brittle and crack or tear, often breaking during routine disassembly for stereo, window, or heater work. Replacement OEM panels a… Repairs typically run $50-$800. Severity: low.
What is the 1993-1998 Toyota Supra Rear Subframe and Differential Bushing Wear (Clunks and Wheel Hop)?
The rubber rear subframe mounts and differential bushings deteriorate with age and torque load, producing a clunk or bang from the rear when getting on or off the throttle, wheel hop under hard launches, and a vague, swaying rear end on the highway. This is one of the most common… Repairs typically run $200-$900. Severity: low.
