The FD RX-7 is a high-strung rotary sports car that rewards meticulous maintenance but punishes neglect. Most survivors have engine rebuilds in their history, and turbo/cooling systems are chronic trouble spots past 60k miles.
Rotary Engine Apex Seal Failure & Loss of Compression
Common · high severityTypical onset: 60,000-100,000 mi
Symptoms: Hard cold starting or extended cranking, Blue smoke on deceleration, Loss of power especially at high RPM, Rough idle and misfires, Failed compression test showing uneven rotor faces
Fix: Full engine rebuild required: disassembly, replace apex seals, side seals, springs, bearings, and resurface rotor housings. Specialty rotary shop needed. 20-30 labor hours plus machining.
Estimated cost: $3,500-6,500
Sequential Turbo System Failures (Actuators & Solenoids)
Common · medium severityTypical onset: 50,000-90,000 mi
Symptoms: Boost surging or cutting out above 4500 RPM, Check engine light with turbo-related codes, Secondary turbo not engaging, Limp mode activation, Wastegate rattling noises
Fix: Replace turbo actuators, precontrol solenoid valve, air control valve, and vacuum lines. Sometimes both turbos need rebuilding if oil-starved. 8-12 hours labor.
Estimated cost: $1,200-3,000
Radiator & Cooling System Inadequacy Leading to Overheating
Common · high severityTypical onset: 70,000-120,000 mi
Symptoms: Coolant temps exceeding 210°F under load, Coolant reservoir boiling over, Heater blowing cold during idle, Warped housings from heat cycles, AST (air separator tank) cracking
Fix: Upgrade to aluminum radiator, replace water pump, thermostat, all hoses, and AST. Flush system completely. OEM radiator is marginal even when new. 6-8 hours.
Estimated cost: $1,000-1,800
Vacuum Line Rot & Rat's Nest Complexity
Common · medium severityTypical onset: 60,000-100,000 mi
Symptoms: Rough idle and stalling, Boost leaks and underboost, Erratic turbo behavior, HVAC blend doors not working, Hissing sounds under hood
Fix: Replace entire vacuum line network (the 'rat's nest' of emissions and turbo control lines). Many delete emissions components. 4-6 hours if methodical.
Estimated cost: $400-800
Transmission Synchro Wear (2nd & 3rd Gears)
Occasional · medium severityTypical onset: 80,000-130,000 mi
Symptoms: Grinding into 2nd or 3rd gear, Difficulty downshifting under load, Gear pop-out under deceleration, Notchy shifter feel
Fix: Transmission removal and rebuild with new synchros, bearings, and seals. R154 transmission shares Toyota Supra parts. 10-14 hours labor.
Estimated cost: $2,000-3,200
Fuel System Vapor Lock & Fuel Pump Heat Soak
Occasional · medium severitySymptoms: No-start when hot after short stops, Stumbling and hesitation in traffic on hot days, Fuel pressure drop after heat soak, Extended cranking after sitting 10-20 minutes
Fix: Insulate fuel lines, upgrade fuel pump to higher-flow model, add heat shielding around pump and lines. Some install in-tank pump relocation. 3-5 hours.
Estimated cost: $500-1,000
Differential & Axle Seal Leaks
Occasional · low severityTypical onset: 70,000-110,000 mi
Symptoms: Gear oil puddles under rear of car, Rear brake contamination if severe, Whining differential noise if oil level drops
Fix: Replace pinion seal and/or axle seals. Sometimes requires diff removal if pinion nut won't hold torque. 3-5 hours.
Estimated cost: $400-700
Power Steering Pump Failures & Rack Leaks
Occasional · low severityTypical onset: 80,000-120,000 mi
Symptoms: Whining or groaning when turning, Steering effort increases, Fluid leaks at pump or rack boots, Shimmy or vibration in steering wheel
Fix: Replace power steering pump and/or rack seals. Many delete power steering entirely for track use. 4-6 hours for rack replacement.
Estimated cost: $600-1,200
Buy only if you have a trusted rotary specialist nearby and budget $2k/year for maintenance — this is a second car for enthusiasts, not a daily driver for the faint of heart.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.