1994 Mazda MX-5 Miata Problems: 11 Known Issues

On the 1990-1997 Mazda MX-5 Miata, both the 1.6L B6 and 1.8L BP engines in the NA Miata use a timing belt that requires replacement every 60,000 miles. These engines are generally regarded as non-interference, so a broken belt usually strands the car without bending valves, but it stops the engine without warning. The water pump, driven by the timing belt, frequently leaks around the same interval and should be replaced proactively.

On the 1990-2015 Mazda MX-5 Miata, all generations of Miata (NA through NC) are prone to rear main seal leaks as the engine ages. Oil seeps from the crankshaft rear seal, dripping onto the clutch housing and eventually contaminating the clutch disc. High mileage engines and infrequent oil changes accelerate seal deterioration. This is a labor-intensive repair as the transmission must be removed.

On the 1990-2005 Mazda MX-5 Miata, the 1.6L B6 and 1.8L BP engines use hydraulic lash adjusters inside the bucket followers. Varnish and sludge from extended oil changes, or oil that is too thick or too thin, restrict flow into the adjuster so it cannot stay pumped up. The result is a persistent sewing-machine tick from the top of the engine, loudest on cold start and often not fully quiet once warm. It is frequently misdiagnosed by inexperienced buyers as rod knock, which is a deeper, lower-pitched noise from the bottom end.

On the 1994-1997 Mazda MX-5 Miata 1.8L BP, on 1.8L BP engines, the Cam Angle Sensor (commonly called the CAS) mounts at the rear of the cylinder head, engaging the camshaft, and is sealed to the head by a single rubber O-ring. With age and heat cycling the O-ring hardens and shrinks, letting oil weep out of the back of the head. This is widely cited as the single most common oil-leak source on NA/NB Miatas; it typically fails before the valve-cover gasket. The oil runs down onto the nearby heater hoses (which it can rot) and the bellhousing. It is a nuisance leak rather than a failure, but a badly heat-soaked or oil-fouled CAS can also contribute to intermittent driveability faults.

On the 1990-2008 Mazda MX-5 Miata, the externally mounted clutch slave cylinder on NA/NB/NC Miatas fails at the piston seal. Fluid weeps past the seal and collects behind the rubber boot, then the cylinder stops holding pressure and the pedal drops to the floor with no gear engagement - frequently without warning. Cars fitted with high-clamp aftermarket pressure plates fail sooner because of the higher pedal pressure, and owners repeatedly report cheap non-Mazda replacement cylinders lasting under a year. The ND uses a different, largely plastic-bodied slave (N251-41-920) that owners also criticize for durability.

On the 1990-1999 Mazda MX-5 Miata, nA and NB Miatas are prone to structural rust in two well-known areas: the rear ends of the rocker panels (sills) and the front frame rails behind the front wheels. Road water enters through wheel-arch pinch welds and body seams and collects inside the double-layer sheet metal, rotting it from the inside out even when exterior paint looks fine. NB (1999+) frame rails are double-layer ('tinfoil sandwich') and rust worse than the single-layer NA rails. Salt-belt/winter cars are worst, but even garage-kept examples show rear-rocker rot. Because the rockers are structural on these unibody roadsters, advanced rot compromises chassis rigidity and safety.

On the 1990-2025 Mazda MX-5 Miata, miata soft tops deteriorate over time from UV exposure, flexing during operation, and age. Vinyl tops develop cracks and tears, cloth tops fade and shrink. The rear plastic window (NA) or glass window (NB/NC/ND) can delaminate from the top material, causing water leaks and reduced visibility. Expected soft top life is 7-10 years with proper care.

On the 1990-1999 Mazda MX-5 Miata, nA and most early NB tops use a flexible plastic (vinyl) rear window, on many NA tops joined to the top with a zipper so the window can be lowered. With UV exposure and age the plastic yellows, hazes to near-opaque, and cracks (often starting at corners or the zipper seam); the zipper stitching tears out where the window meets the top. This is a near-universal age issue on unrestored cars and badly hurts rear visibility. A glass rear window with defroster was optional/standard on some later NB tops and does not haze, but zipper-window NA tops are the common case in this era.

On the 1994-2000 Mazda MX-5 Miata, the 1994-2000 1.8L BP engines use a wasted-spark coil pack with an integrated igniter transistor. The early version (identified by the 4-pin input connector, later revised to 3-pin) is notorious for internal igniter/solder-joint failure, especially if the ignition is left in the ON position with the engine not running - the igniter transistor overheats and either burns out or melts its own solder connections. The result is a dead cylinder pair, a persistent misfire, and unburned fuel dumped into the catalytic converter.

On the 1990-1997 Mazda MX-5 Miata, the NA's retractable headlights are driven by two independent retractor motors, each containing a limit-switch assembly of three spring contacts riding on printed traces plus a set of diodes under a white plastic cover. Grease dries and the contacts and traces wear, so one light hunts up and down repeatedly before parking, stalls half-raised, or drops while driving. The shared 30A headlight relay and its fuse are the other common single point of failure, and a popped cap at the motor-to-linkage connection lets a lamp fall on its own.

On the 1990-1999 Mazda MX-5 Miata, both the 1.6L B6 and 1.8L BP are belt-driven and Mazda specifies timing-belt replacement at 60,000 miles. On 25-35 year-old cars, belts frequently fail on age/dry-rot rather than mileage. The engines are non-interference, so a snapped belt will not bend valves, but it will strand the car. The water pump is driven behind the timing belt and commonly weeps or fails in the same 70k-170k window, so it is standard practice to replace the pump, tensioner, and seals while the belt is off since ~90% of the labor overlaps.