The 1994 MX-6 shares the Ford CD4 platform with the 626 and Probe, offering decent handling but plagued by automatic transmission failures (V6 models especially) and upper engine issues on high-mileage V6s. The 2.0L I4 with manual transmission is the most reliable configuration.
Automatic Transmission Failure (CD4E - V6 models)
Common · high severityTypical onset: 80,000-130,000 mi
Symptoms: Harsh 2-3 shift or slipping between gears under load, Delayed engagement when shifting from Park to Drive, Transmission overheating, burnt ATF smell, Check Engine light with transmission codes
Fix: The CD4E is notoriously weak behind the 2.5L V6. Internal clutch pack failure and valve body issues are typical. Rebuild runs 12-16 hours labor; used replacement 8-10 hours. Most shops recommend replacement over rebuild due to poor long-term reliability of rebuilds on this unit.
Estimated cost: $2,200-3,800
Head Gasket Failure (2.5L V6)
Occasional · high severityTypical onset: 120,000-180,000 mi
Symptoms: White smoke from exhaust, especially on cold start, Coolant loss with no visible leaks, Rough idle, misfires on one bank, Oil milkshake (coolant in oil) in severe cases
Fix: The KL-series V6 can blow head gaskets between cylinders or into coolant passages. Requires both heads pulled, resurfaced, new gaskets, timing belt service while you're in there. Book time 14-18 hours including machine work. If heads are warped beyond spec, add $400-600 for new/reman heads.
Estimated cost: $2,000-3,200
Distributor O-Ring Oil Leak (2.0L I4)
Common · low severityTypical onset: 60,000-100,000 mi
Symptoms: Oil pooling on top of bellhousing, Oil dripping onto exhaust manifold, burning smell, Distributor area visibly wet with oil
Fix: The distributor mounts to the back of the cylinder head with a thin O-ring seal that hardens and fails. Simple fix: pull distributor (mark rotor position), replace O-ring, reinstall. Takes 1-1.5 hours. Ignore it and oil can foul the clutch on manual trans cars.
Estimated cost: $120-220
Engine Mount Collapse (Transmission Mount Especially)
Common · medium severityTypical onset: 70,000-110,000 mi
Symptoms: Heavy clunk when shifting from Reverse to Drive, Vibration at idle in Drive with A/C on, Visible engine movement when revving in Park, Shifter feels loose or imprecise
Fix: The hydraulic transmission mount (right side) and front engine mount fail frequently. Transmission mount is 1.5-2 hours; do both motor mounts while you're under there (total 3-4 hours). OEM-quality aftermarket parts are acceptable; cheap ones last 18 months.
Estimated cost: $350-650
Fuel Filter Clogging / Fuel Pump Weak
Occasional · medium severityTypical onset: 90,000-150,000 mi
Symptoms: Hesitation or stumble during acceleration, Hard starting when hot, Loss of power above 4,000 RPM, Stalling in hot weather after sitting
Fix: In-tank fuel pump gets weak; external inline fuel filter (under car near tank) rarely gets changed and clogs. Start with filter replacement (0.5 hours, $30 part). If problem persists, pump replacement is 2-3 hours dropping the tank. Test fuel pressure first: should see 38-45 psi.
Estimated cost: $80-450
Ignition Switch Failure (NHTSA Recall)
Occasional · medium severitySymptoms: No crank, no start intermittently, Accessories work but starter won't engage, Key feels loose or won't return from START position, Dash lights flicker when turning key
Fix: Electrical portion of ignition switch (not the lock cylinder) fails. There was a recall but many weren't completed. Replacement is 1.5-2 hours removing lower column covers and electrical connectors. If recall wasn't done, parts are cheap aftermarket.
Estimated cost: $150-320
Timing Belt & Water Pump (2.5L V6)
Common · high severityTypical onset: 60,000 mi intervals
Symptoms: No symptoms until catastrophic failure, Engine won't start, bent valves if belt snaps, Coolant leak from weep hole if water pump bearing fails
Fix: This is an interference engine—belt breaks, valves meet pistons, engine destroyed. Timing belt service is 5-7 hours including water pump, tensioner, seals. Do it every 60k religiously. If previous owner skipped it and you're at 90k+, do it immediately or budget for engine replacement.
Estimated cost: $650-950
Buy the 4-cylinder manual if you want a fun, fixable coupe; avoid the V6 automatic unless you enjoy shopping for transmissions.
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.