Mazda Rx-7 Years to AvoidThe weakest years — and the one you should buy instead

Apex seals, side seals, and corner seals wear down over time, leading to a loss of compression. Internal coolant seals can also fail, leading to coolant entering the combustion chamber or oil. Carbon buildup is common and contributes to seal wear. This is the primary reason for expensive engine rebuilds.

The complex sequential turbo setup (vacuum lines, solenoids, check valves, pre-control, wastegate actuators) is prone to failure, often due to cracked vacuum lines or failing solenoids. Overheating can also damage the turbos directly, leading to reduced boost or complete failure.

The 13B-REW runs hot, and a marginal cooling system can lead to serious engine damage. Radiators, coolant hoses, thermostat, and water pump are all critical. Older plastic components become brittle, and small leaks can quickly escalate into overheating scenarios that destroy the engine.

Apex seals and side seals wear down over time, leading to loss of compression, hard starting, and eventual catastrophic engine failure. Carbon buildup exacerbates these issues. The turbocharger (on TII models) is also a known weak point, with seals and bearings failing.

The rotary engine generates significant heat, making the cooling system critical. Old radiators, cracked hoses, failed water seals, and malfunctioning thermostats are common, quickly leading to engine overheating and potential apex seal damage or coolant seal failure.

Aging wiring harnesses and connectors lead to intermittent issues. Common failures include pop-up headlight motors, power window regulators, instrument cluster problems (e.g., flickering gauges), and various sensor failures (e.g., Air Flow Meter, Crank Angle Sensor).

Apex seals fail due to heat, carbon buildup, or material fatigue, leading to loss of compression and eventual engine rebuild. Overheating is a constant threat due to factory cooling system limitations and brittle hoses. Vacuum lines degrade, causing boost control issues and reduced performance. Oil consumption is normal, but excessive consumption or coolant mixing indicates internal failure.

The complex sequential turbo system is prone to vacuum line leaks, solenoid failures, and wastegate issues. Turbo seals can fail, leading to excessive oil consumption and smoke. The transition between turbos can be rough or fail entirely, compromising performance. This system is extremely sensitive to proper maintenance and heat.

Aging wiring harnesses and brittle insulation lead to intermittent shorts, ground issues, and sensor failures (e.g., MAP, TPS, O2). The ECU is susceptible to heat damage, particularly if located near the engine. Window motors, headlight motors, and climate control units are common points of failure.

Apex seal failure due to overheating, carbon buildup, or lean conditions. Hot spots lead to rotor housing damage. Oil metering pump (OMP) issues can starve apex seals of lubrication.

Failure of the ceramic primary turbo seals, manifold cracking, wastegate issues, and problems with the complex control system (solenoids, vacuum lines) leading to boost loss or 'limp mode'.

Inadequate stock cooling capacity leads to chronic overheating, especially in hot climates or under hard driving. Radiator end tank cracking, hose deterioration, and thermostat failures are common.

The 13B-REW rotary engine is notorious for apex seal failure, coolant O-ring leaks (leading to internal coolant consumption and overheating), and rotor housing wear. These issues often stem from inadequate maintenance, poor tuning, or simply the inherent design limitations of a high-stress rotary, leading to low compression and eventual rebuilds.

The complex sequential twin-turbo setup (known as 'rats nest' due to vacuum lines) is highly susceptible to failure. Common issues include vacuum line degradation, stuck wastegates/pre-control actuators, failing solenoid valves, and turbo bearing wear, leading to loss of boost, limp mode, or complete turbocharger failure.

The RX-7 runs hot, and its cooling system is barely adequate from the factory. Age-related failures of radiators, coolant hoses, water pumps, and thermostat housings are common. Overheating can quickly lead to engine damage, especially coolant seal failure. Air bubbles in the system are also problematic.

The twin-turbo 13B-REW engine is highly sensitive to heat, oil quality, and proper operation. Apex seal failure, turbocharger bearing issues, worn oil control rings, and carbon buildup are common. Catastrophic engine failure often results from ignored symptoms or poor tuning.

The RX-7's cooling system is notoriously complex and barely adequate from the factory. Aging plastic components (hoses, radiator end tanks), neglected coolant flushes, failed thermostats, and faulty fan motors can quickly lead to overheating and irreparable engine damage. The sequential turbo control system adds heat and complexity.

The sequential turbo system relies on an intricate network of vacuum lines, solenoids, and check valves which degrade over time, leading to 'limp mode' or inconsistent turbo performance. Aging wiring harnesses, sensor failures (MAP, O2, coolant temp), and instrument cluster issues are common due to age and heat.

The twin-turbo rotary engine is notorious for apex seal failure and coolant seal degradation, leading to compression loss, hot start issues, and catastrophic failure. Overheating is a primary killer, often due to neglected cooling systems or poor tuning. Turbos can fail, especially the complex sequential system.

The intricate network of vacuum lines, solenoids, and actuators controlling the sequential turbochargers is a labyrinth of potential failure points. Brittle lines and failing solenoids lead to boost issues, 'limp mode,' and poor performance, often misdiagnosed as engine problems.

The rotary engine generates immense heat, making a perfectly functioning cooling system paramount. Radiators clog, hoses burst, and thermostat failures are common. Neglecting this leads directly to engine overheating and seal failure, often without immediate warning.

The twin-turbo rotary engine is highly susceptible to apex seal failure and loss of compression, particularly if subjected to neglect, overheating, or improper tuning. This often necessitates a complete engine rebuild.

The sequential twin-turbo setup is complex and operates under extreme heat. Wastegate issues, oil coking, and bearing wear are common, leading to diminished boost, smoking, or catastrophic failure.

The factory cooling system is often considered inadequate for the heat-sensitive rotary engine. Radiator leaks, hose failures, and water pump issues are common, leading to overheating which can quickly destroy the engine.

Apex seals and coolant O-rings are primary wear items, leading to compression loss, misfires, hard starting (especially when warm), and eventual engine rebuilds. Carbon buildup from short trips exacerbates these issues.

The Hitachi HT18 turbocharger found on Turbo II models is prone to bearing wear and oil seal failure, leading to excessive smoke from the exhaust, reduced boost, and potential catastrophic turbo failure if neglected.

Brittle wiring, failing sensors (e.g., TPS, O2), sticky relays, and numerous aging vacuum lines developing leaks can cause erratic engine behavior, starting difficulties, idle issues, and non-functional accessories like pop-up headlights or power windows.

The 13B rotary engine, especially apex seals and coolant seals, is prone to wear and failure. Carbon buildup and frequent overheating can accelerate this, leading to loss of compression and eventual engine rebuilds. Turbocharged (Turbo II) models also suffer from turbocharger failure.

These cars are notorious for rust, particularly in wheel arches, rocker panels, behind the rear wheels, subframe mounting points, and strut towers. Fuel tank straps and surrounding areas are also common rust zones, indicating poor rust protection from the factory.

Age-related degradation of wiring harnesses, flaky relays, and failing components (e.g., power window motors, pop-up headlight motors, dashboard gauges, climate control components) are very common. Tracing intermittent electrical faults can be a major headache.

Apex and corner seals are prone to wear, leading to compression loss, excessive oil consumption, and eventual engine failure. This is often exacerbated by poor maintenance, pre-mix neglect, or repeated overheating.

The complex array of vacuum lines, solenoids, and check valves controlling the twin sequential turbochargers is a major failure point. Leaks, cracked lines, and failing solenoids lead to erratic boost delivery, 'limp mode,' and potential turbo damage.

The stock cooling system is often insufficient for the high heat generated by the rotary engine, especially under spirited driving. Radiators are prone to cracking, hoses fail, and thermostats can stick, leading to dangerous overheating scenarios that can quickly destroy the engine.

Apex seal failure, carbon buildup leading to compression loss, and rotor housing wear are common. This typically manifests as difficult hot starts, excessive oil consumption, loss of power, or catastrophic engine failure. It's a high-revving, high-temperature engine that is very sensitive to proper cooling, oil changes, and ignition system health.

The complex sequential turbo system, with its myriad of vacuum lines, solenoids, and actuators, is a major source of headaches. Solenoids fail, vacuum lines crack, and the turbos themselves (especially the primary) are prone to bearing wear and wastegate issues, leading to boost inconsistencies or complete failure.

The rotary engine generates significant heat, making the cooling system absolutely critical. Radiators clog, hoses degrade, and plastic overflow tanks become brittle. Overheating is a death sentence for a rotary, often leading to immediate and irreversible engine damage.

The 13B-REW's apex seals and coolant seals are notorious failure points. Overheating, improper oil changes, or high mileage can lead to loss of compression, internal coolant leaks, or catastrophic failure requiring a costly rebuild.

The complex sequential twin-turbo setup (especially the changeover valve) is highly susceptible to vacuum line failures, wastegate issues, and bearing wear, leading to a loss of boost or complete turbocharger failure. Heat is a major contributor to these issues.

The RX-7 runs hot, and a compromised cooling system can quickly lead to engine damage. Radiators, hoses, thermostat, and fans are often inadequate for spirited driving or track use, leading to premature engine wear or failure.

Apex seals, side seals, and coolant O-rings are consumable items that wear over time, leading to loss of compression, increased oil/coolant consumption, and eventually engine failure. This is the primary reason for rotary rebuilds.

The rotary engine is highly sensitive to overheating. Aging radiators, hoses, water pumps, and thermostat failures are common, leading to engine damage (coolant seal failure, housing warpage).

Due to age, wiring harnesses become brittle, connectors corrode, and components like headlight motors, window switches, and instrument cluster gauges fail, leading to intermittent issues or complete malfunction.

The 13B rotary engine is notorious for apex seal wear leading to compression loss, hot start issues, and eventually complete failure. Coolant seal degradation is also common, allowing coolant into the combustion chambers, accelerating engine wear. Neglecting oil changes or using incorrect oil significantly shortens its life.

The RX-7's cooling system is barely adequate when new and becomes a critical weak point with age. Radiators crack, hoses become brittle, and thermostats fail, leading to overheating which is fatal for the rotary engine. A robust, upgraded cooling system is essential to prevent engine damage.

As these cars age, wiring harnesses degrade, connectors corrode, and sensors fail. Common issues include faulty Mass Air Flow (MAF) sensors, Crank Angle Sensors (CAS), power window motors, and general dashboard gauge malfunctions. Tracing these issues can be time-consuming and frustrating.

Apex seals, corner seals, and side seals wear over time, leading to loss of compression, increased oil consumption, and eventual engine failure. Carbon buildup accelerates this wear. Overheating is a primary killer of these seals.

Radiators are often clogged or corroded, hoses become brittle, and water pumps can fail. Thermostat issues and faulty coolant level sensors are common. Overheating is catastrophic for the rotary engine.

Due to age and materials of the era, these vehicles are highly susceptible to rust in common areas like rocker panels, wheel arches, frame rails, strut towers, and the floorboards, especially in areas exposed to road salt.

The 13B rotary engine's apex seals and coolant seals are notorious wear items. Apex seals can fail from carbon buildup, overheating, or simply age/mileage, leading to compression loss. Coolant seals can degrade, causing internal coolant leaks and severe overheating. Both are major failures requiring engine removal and rebuilding.

The RX-7's cooling system is barely adequate even when new, and decades of heat cycles degrade radiators, hoses, and thermostats. Failures lead to overheating, which is catastrophic for a rotary engine, directly contributing to coolant seal failure and warped housings.

Aging wiring harnesses become brittle, leading to shorts, intermittent power issues, and sensor failures (e.g., AFM, O2 sensor). Common issues include failing power window motors, pop-up headlight motors, accessory relays, and dashboard instrument cluster glitches due to solder joint fatigue.

The 12A rotary engine is prone to apex seal wear, carbon buildup, and oil control ring issues. Neglect of proper oiling (pre-mixing, regular changes) leads to compression loss and eventual engine failure.

Given its age, the unibody structure, rocker panels, wheel arches, frame rails, and strut towers are highly susceptible to rust, especially in regions exposed to salt and humidity. Can compromise structural integrity.

The Hitachi downdraft carburetor can develop issues with wear, vacuum leaks, and clogging due to ethanol in modern fuels. This leads to poor idle, hesitation, and reduced performance.

The 12A rotary engine is known for its apex seals wearing out over time, leading to compression loss, excessive oil consumption, and eventual failure. Carbon buildup is also a significant concern, exacerbating seal wear and port efficiency.

Like many Japanese cars of its era, the RX-7 is highly susceptible to rust. Common areas include rocker panels, wheel arches, frame rails, strut towers, the battery tray, and floors, often leading to structural compromise if neglected.

After 40+ years, wiring harnesses degrade, connections corrode, and relays fail. This can lead to issues with lighting, gauges, power windows, the radio, and intermittent starting problems.

The Achilles' heel is the rotary engine itself, particularly apex and side seals. These wear down over time, leading to compression loss, excessive oil consumption, difficult hot starts, and ultimately, engine failure. Carbon buildup, if oil changes are neglected or the car is consistently driven gently, accelerates this wear and can cause 'sticky' seals.

Like many Japanese cars of its era, the RX-7 is highly susceptible to rust. Common areas include rocker panels, wheel arches, floor pans, strut towers, frame rails, and even around the windshield. Battery acid leaks can also cause severe corrosion in the engine bay. This significantly compromises structural integrity and aesthetic value.

The original Hitachi carburetor can be complex and prone to issues like vacuum leaks, fuel leaks, sticky floats, and improper tuning. This leads to rough idling, poor fuel economy, hesitation, and difficult starting. Age also causes fuel lines and seals to become brittle, creating potential fire hazards.

The Achilles' heel of the Wankel engine, apex seals wear down over time, leading to compression loss, oil consumption, and eventual engine failure. Carbon buildup accelerates this process.

Overheating is a rotary engine killer. Radiators clog, hoses crack, and water pumps fail, leading to thermal stress that can warp rotor housings or seize the engine. Vigilance is paramount.

Common for Japanese cars of this era, the RX-7 is highly susceptible to rust in rocker panels, wheel arches, frame rails, shock towers, and the battery tray area. This can compromise structural integrity.

Apex seal wear is the primary concern, leading to low compression, misfires, and eventual loss of power. Carbon buildup exacerbates this, particularly if the engine isn't driven hard or proper oiling isn't maintained.

Like many Japanese cars of its era, the RX-7 is highly susceptible to rust, particularly in rocker panels, wheel arches, strut towers, frame rails, and floor pans. This can compromise structural integrity.

Aging rubber fuel lines can crack and leak, fuel pumps can fail, and carbureted models (1984 12A) are prone to carburetor wear and clogging if not properly maintained or if poor fuel quality is used.