2001 MAZDA MX-5 MIATA MAZDASPEED

Typical onset: 60,000-100,000 mi

Symptoms: sudden loss of compression in one or more cylinders, heavy white or blue smoke from exhaust, severe knock or rattle from bottom end, metal shavings in oil, check engine light with misfire codes

Fix: Complete engine rebuild or short block replacement required. Factory tune runs lean under boost causing ringland failure and piston cracking. Expect 25-35 hours labor for proper rebuild with machining, new pistons, rings, bearings, head work, and reassembly. Many owners opt for forged piston upgrade during rebuild.

Estimated cost: $4,500-8,000

Typical onset: 70,000-120,000 mi

Symptoms: coolant loss with no visible leaks, white smoke from exhaust, oil in coolant or coolant in oil, overheating under boost, rough idle when cold

Fix: Head gasket replacement requires removing turbo manifold, timing belt, and cylinder head. Must resurface head and check for warpage. Critical to upgrade cooling system and tune while apart. 12-16 hours labor with head machining.

Estimated cost: $2,200-3,500

Typical onset: 50,000-90,000 mi

Symptoms: excessive drivetrain clunk on acceleration/deceleration, vibration at idle, difficult gear engagement, visible tearing or separation of rubber mount

Fix: The factory powertrain package torque (PPT) mount fails from increased stress of turbo torque. Replacement is straightforward but requires lifting engine slightly. 2-3 hours labor. Many upgrade to solid or poly mounts.

Estimated cost: $200-450

Typical onset: 80,000-130,000 mi

Symptoms: transmission fluid spots under car near front, burnt fluid smell, hard shifting when hot, low fluid level on dipstick

Fix: Cooler lines corrode and develop leaks at crimp fittings or along length. Lines run along subframe and are exposed to road salt. Replacement requires removing undertray and sometimes exhaust. 2-3 hours labor.

Estimated cost: $300-600

Typical onset: 70,000-110,000 mi

Symptoms: loud knocking from bottom end that increases with RPM, low oil pressure at idle when hot, metal particles in oil filter, bearing material visible on drain plug magnet

Fix: Caused by detonation from lean factory tune and owners running 87 octane or boosting pressure without proper tuning. Requires full bottom-end rebuild with crank inspection and likely machining. 20-30 hours for complete teardown and rebuild.

Estimated cost: $3,500-6,500

Symptoms: loss of power above 5,000 RPM, hesitation or stumble under full throttle, fuel cut or misfire under hard acceleration, AFR gauge showing lean conditions if monitored

Fix: Factory fuel pump and filter struggle to maintain pressure at higher boost levels or when aged. Common precursor to engine damage if not addressed. Fuel filter replacement is 1 hour, pump upgrade 3-4 hours. Most owners upgrade injectors and pump together for reliability.

Estimated cost: $400-1,200