2001 HYUNDAI TIBURON

Typical onset: 80,000-140,000 mi

Symptoms: knocking/rod knock at idle or acceleration, oil pressure warning light, metallic rattling that worsens with RPM, sudden loss of power followed by engine seizure

Fix: This is the big one: main and rod bearings fail prematurely due to oiling system deficiencies and poor metallurgy. Requires full engine teardown, typically resulting in short block replacement (12-16 hours) or junkyard engine swap (8-12 hours). Many shops won't rebuild these—too risky. If you catch early knocking, a bearing replacement might work (14-18 hours), but damage to crank journals usually means machine work or new crank.

Estimated cost: $2,800-5,500

Typical onset: 90,000-150,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leaks, overheating under load, milky oil on dipstick or cap, rough idle and misfires

Fix: The Beta II head gasket fails between cylinders or into coolant passages. Head removal and resurfacing required (8-10 hours). Once the head is off, expect to find warpage requiring machining ($150-250) and sometimes cracked valve seats. Timing belt replacement is mandatory while you're in there. This often becomes a gateway to discovering bearing damage if coolant contaminated the oil.

Estimated cost: $1,800-3,200

Typical onset: 70,000-120,000 mi

Symptoms: transmission fluid puddles under engine bay, burnt ATF smell, slipping or delayed shifts, transmission overheating warning (if equipped)

Fix: The steel cooler lines rust through where they connect to the radiator or run along the subframe. If caught early, line replacement is straightforward (2-3 hours), but most owners don't notice until significant fluid loss causes internal trans damage. The four-speed auto in these is marginal to begin with—low fluid plus heat kills clutch packs. Budget for new lines, flush, and filter. If shifts are already slipping, you're looking at rebuild or replacement.

Estimated cost: $400-800 (lines only), $2,200-3,800 (if transmission damaged)

Typical onset: 60,000-100,000 mi

Symptoms: clunking when shifting from Park to Drive, vibration at idle in gear, excessive engine movement visible when revving, difficulty engaging gears smoothly

Fix: The rear transmission mount (dogbone mount) deteriorates and allows the powertrain to shift excessively. This is wear-and-tear, but it accelerates damage to the already-weak cooler lines and axle seals. Replacement is easy (1-1.5 hours), and polyurethane upgrades are available. Do all engine/trans mounts at once if you're keeping the car—the front engine mount usually needs it too.

Estimated cost: $250-450

Typical onset: null

Symptoms: hard starting after sitting, sputtering or loss of power under acceleration, stalling at idle after highway driving, check engine light with lean fuel codes (P0171/P0174)

Fix: The in-tank fuel filter clogs if the car sat or ran on contaminated fuel. Unlike some cars with external filters, this requires dropping the tank (2-3 hours). Often the fuel pump is failing simultaneously, so replace both together. Ethanol fuel degrades the pump impeller over time. If you only do the filter and the pump dies six months later, you're paying tank-drop labor twice.

Estimated cost: $450-750

Typical onset: 100,000-160,000 mi

Symptoms: blue smoke on startup or deceleration, excessive oil consumption (quart every 500-800 miles), fouled spark plugs, loss of compression in one or more cylinders

Fix: The ring lands crack or the rings themselves fail, usually on cylinders 2 and 3. Compression test will show it clearly. This requires piston replacement and honing, which means the engine is 80% apart anyway—at this point you're doing a full rebuild or walking away. Oil burning that starts gradually always gets worse. Some owners band-aid it by running heavier oil and topping off constantly, but that just delays the inevitable bearing failure.

Estimated cost: $2,500-4,200