2004 HYUNDAI TIBURON

Typical onset: 80,000-130,000 mi

Symptoms: heavy knocking from lower engine on cold start, metallic rattling under acceleration, sudden loss of oil pressure, check engine light with misfire codes, metal shavings in oil

Fix: Complete engine rebuild or replacement required. Connecting rod bearings fail due to inadequate oiling and bearing clearance issues. Expect 18-25 labor hours for rebuilt short block swap, 30+ hours for complete teardown and rebuild with machine work.

Estimated cost: $3,500-6,500

Typical onset: 70,000-110,000 mi

Symptoms: transmission slipping or delayed engagement, milky pink fluid in coolant reservoir, overheating transmission, harsh shifting, coolant loss with no external leaks

Fix: Internal cooler in radiator fails, allowing coolant and ATF to mix — destroys transmission if not caught early. Requires radiator replacement plus full transmission flush minimum. If trans is damaged, rebuild adds 12-16 hours. Many techs recommend replacing radiator proactively on high-mileage examples.

Estimated cost: $400-800 (cooler only), $2,200-3,800 (with trans rebuild)

Typical onset: 60,000-100,000 mi

Symptoms: clunking when shifting from park to drive, excessive vibration at idle, visible engine movement when revving, harsh engagement into gear

Fix: Rubber isolators deteriorate faster than typical due to engine positioning and torque load. Front and rear mounts typically need replacement together. 2-3 labor hours for both mounts.

Estimated cost: $350-600

Typical onset: 90,000-140,000 mi

Symptoms: white smoke from exhaust on cold start, coolant loss with no visible leaks, rough idle and misfire, overheating, milky oil on dipstick or cap

Fix: Multi-layer steel gaskets fail, often on both banks simultaneously. Requires cylinder head removal on both sides, machining if warped (common), new timing components recommended during reassembly. 14-18 labor hours plus machine shop time.

Estimated cost: $2,800-4,200

Typical onset: 80,000-120,000 mi

Symptoms: intermittent no-start or extended cranking, loss of power under load, sputtering at highway speeds, check engine light with fuel trim codes

Fix: In-tank fuel filter rarely serviced causes pump to work harder and fail prematurely. Pump replacement requires tank drop. Many owners never change filter per 30k mile service interval. 3-4 labor hours for pump and filter together.

Estimated cost: $500-850

Typical onset: 100,000-150,000 mi

Symptoms: blue smoke on startup or deceleration, burning 1+ quart per 1000 miles, fouled spark plugs, carbon buildup on intake valves, reduced compression on leak-down test

Fix: Ring sealing degrades due to marginal oiling system design. Can sometimes be temporarily improved with high-mileage oil and more frequent changes, but proper fix requires complete teardown and re-ring at minimum. 25+ labor hours for proper rebuild with honing.

Estimated cost: $3,200-5,500