1994 HONDA NSX NA1

Typical onset: Every 60,000-90,000 mi or 7 years, whichever comes first

Symptoms: No warning until catastrophic failure, Potential valve-to-piston contact if belt snaps, Water pump weeping coolant if original

Fix: This is an interference engine—belt failure destroys valves and pistons. Replace timing belt, tensioner, water pump, and all accessory belts as a package. 8-10 labor hours due to mid-engine layout and tight access. Use OEM Honda parts only.

Estimated cost: $2,000-3,500

Typical onset: Any mileage, heat-cycled age dependent

Symptoms: No-start condition when engine is hot, Fuel pump does not prime, Car starts fine when cool, dies after warm-up

Fix: The PGM-FI main relay under the driver's dash has cold solder joints that crack with heat cycles. Remove relay, reflow solder joints with quality 60/40 rosin core, or replace unit. 0.5-1 hour DIY, many owners do this themselves.

Estimated cost: $150-300

Typical onset: 80,000-150,000 mi

Symptoms: Slow or jerky window operation, Window drops into door, Grinding or clicking noise when operating switch

Fix: Plastic gears and sliders in the regulator assembly disintegrate. OEM parts are NLA for some components; aftermarket or used JDM units required. 2-3 hours per side to remove door card and replace regulator assembly.

Estimated cost: $400-800 per side

Typical onset: 60,000-120,000 mi on affected VINs

Symptoms: Sudden loss of all gears, Grinding or clunking from transmission, Transmission jumps out of gear under load

Fix: Early production transmissions (VIN ranges up to MT002000 or AT000700) used weak snap rings that pop out, destroying the countershaft. Check VIN history—if not already replaced, transmission must come out for snap ring upgrade. 12-15 hours labor for trans removal and rebuild in mid-engine bay.

Estimated cost: $3,500-6,000

Typical onset: 100,000+ mi or 20+ years

Symptoms: Oil seepage around valve covers, Burning oil smell from exhaust manifolds, Oil pooling on top of engine or dripping onto exhaust

Fix: Valve cover gaskets and cam plug O-rings harden with age. Mid-engine access is tight; remove engine cover, airbox, and throttle body for proper access. Replace all gaskets, cam plugs, and spark plug tube seals while in there. 4-6 hours labor.

Estimated cost: $800-1,500

Typical onset: 80,000-150,000 mi

Symptoms: ABS warning light stays on, Brake pedal feels spongy or overly firm, Loss of ABS function, normal braking remains

Fix: The ABS modulator develops internal leaks; the accumulator loses pressure. OEM parts are discontinued. Options: used JDM unit, aftermarket rebuild service, or ABS delete (legal for track cars only). 3-4 hours to replace modulator assembly.

Estimated cost: $1,500-3,000

Typical onset: 120,000+ mi or severely neglected oil changes

Symptoms: Ticking or tapping noise from cylinder heads at idle, Noise increases with RPM, Loss of power if valves are out of adjustment

Fix: C30A uses solid lifters requiring periodic valve adjustment every 30k miles. If neglected, lifters and cam lobes wear. Valve adjustment: 2-3 hours. Lifter replacement if damaged: 8-12 hours including head removal. Oil starvation from low oil or long intervals accelerates wear.

Estimated cost: $300-600 for adjustment; $2,500-4,500 for lifter replacement with heads off

Typical onset: 60,000-90,000 mi depending on driving style

Symptoms: Slipping under hard acceleration, High engagement point, Clutch pedal chatter or judder

Fix: OEM clutch is robust but shows age. Flywheel may need resurfacing or replacement if hot-spotted. Mid-engine layout makes this an expensive job. 10-12 hours labor to drop transmission, replace clutch, pressure plate, throw-out bearing, and resurface or replace flywheel.

Estimated cost: $2,500-4,000