The 1990 Mitsubishi Eclipse is known for head gasket issues, which can lead to engine overheating and coolant leaks.

Timing belts in older models like the 1990 Eclipse can wear out or break, causing severe engine damage if not replaced at recommended intervals.

Particularly in the turbocharged versions, the engine's crankshaft can develop excessive end play, leading to performance issues and potentially catastrophic engine failure.

Multi Point Injectors may become clogged or fail, leading to poor engine performance and reduced fuel efficiency.

For turbocharged models, the turbocharger may fail due to wear and tear, leading to reduced engine power and efficiency.

Older seals and gaskets can deteriorate, leading to oil leaks that can cause engine damage if not addressed.

Manual transmissions in the 1990 Eclipse can experience synchro wear, making it difficult to shift gears smoothly.

Wiring and electrical components can become brittle and fail over time, causing various electrical issues in the vehicle.

The Mitsubishi Sigma from 1990 is known to have issues with oil leaks, often due to aging gaskets and seals.

This model commonly faces overheating problems, which can be caused by a failing radiator, water pump, or thermostat.

The automatic transmission in the 1990 Mitsubishi Sigma can experience problems with shifting and may require frequent maintenance or repair.

Older electrical systems in this model can lead to issues such as faulty wiring, failing alternators, or malfunctioning sensors.

The suspension components, including bushings and shocks, tend to wear out over time, leading to a rough ride and poor handling.

Due to its age, the 1990 Mitsubishi Sigma is prone to developing rust, particularly in the undercarriage and wheel wells.

The 1990 Mitsubishi Eclipse is known for head gasket issues, which can lead to engine overheating and coolant leaks.

Timing belts in older models like the 1990 Eclipse can wear out or break, causing severe engine damage if not replaced at recommended intervals.

Particularly in the turbocharged versions, the engine's crankshaft can develop excessive end play, leading to performance issues and potentially catastrophic engine failure.

Multi Point Injectors may become clogged or fail, leading to poor engine performance and reduced fuel efficiency.

For turbocharged models, the turbocharger may fail due to wear and tear, leading to reduced engine power and efficiency.

Older seals and gaskets can deteriorate, leading to oil leaks that can cause engine damage if not addressed.

Manual transmissions in the 1990 Eclipse can experience synchro wear, making it difficult to shift gears smoothly.

Wiring and electrical components can become brittle and fail over time, causing various electrical issues in the vehicle.

The 1990 Mitsubishi Galant is known to suffer from engine overheating, often due to a failing thermostat or a clogged radiator.

The timing belt in this model is prone to wear and tear, which can lead to serious engine damage if it breaks.

Some drivers report problems with the automatic transmission, including slipping gears and rough shifting.

Common electrical issues include faulty alternators and battery drainage, which can lead to starting problems.

The suspension components, particularly the struts and shocks, often wear out prematurely, leading to a rough ride and poor handling.

The brake pads and rotors can wear out quickly, requiring frequent replacements to ensure proper braking performance.

The engine is prone to developing oil leaks, often from the valve cover gasket or oil pan gasket.

Problems with the fuel pump or fuel injectors can cause poor fuel delivery, leading to performance issues and stalling.

Hydraulic brake systems can develop leaks in the brake lines, master cylinder, or calipers, leading to reduced braking efficiency.

Continuous use of brakes, especially under heavy loads, can cause the brake fluid to overheat, reducing braking power.

Over time, brake pads and rotors wear out and need replacement to maintain effective braking.

V-shaped engines can sometimes have cooling issues, especially if the radiator or water pump is not functioning properly.

V6 engines, like the one in the Montero, can develop oil leaks from valve covers, oil pan gaskets, and other seals.

The 1990 Mitsubishi Montero's V6 engine relies on a timing belt, which can wear out or break if not replaced at recommended intervals.

Older vehicles can develop problems with the fuel pump, fuel injectors, or fuel filter, leading to poor engine performance.

Aging wiring and connectors can lead to various electrical issues, including problems with the ignition system, sensors, and lighting.

Older vehicles, especially those exposed to moisture and road salt, can develop rust and holes in the exhaust system.

The suspension components, such as bushings, ball joints, and shocks, can wear out over time, leading to a rough ride and poor handling.

If the transmission fluid is not regularly changed, it can lead to wear and tear on the transmission components, causing shifting problems.

Older engines may develop vacuum leaks, which can cause rough idling, stalling, and poor fuel economy.