2000 MITSUBISHI GTO

Typical onset: 80,000-150,000 mi

Symptoms: Loud ticking/tapping at idle especially when cold, Noise diminishes after warmup but never fully disappears, P0300-series misfire codes in severe cases, Loss of valve timing accuracy

Fix: Hydraulic lifters collapse from oil sludge or wear. Requires removal of both cam covers (nightmare access on turbo models), replacing all 24 lifters, and often camshaft inspection. Typical job is 12-16 hours labor due to AWD/turbo plumbing removal. Many shops quote 14 hours. Parts run $800-1200 for quality lifters plus gaskets.

Estimated cost: $2,800-4,200

Typical onset: 60,000-80,000 mi intervals

Symptoms: Due service or overdue mileage, Coolant seepage from water pump weep hole, Squealing on cold starts, Catastrophic engine damage if belt snaps - interference engine

Fix: This is an interference engine - belt failure destroys valves and pistons. Job requires 8-12 hours due to transverse V6 packaging and removal of numerous accessories, intercooler piping on TT models. MUST replace tensioners, idlers, water pump, and all accessory belts simultaneously. Non-negotiable maintenance item.

Estimated cost: $1,800-2,800

Typical onset: 70,000-120,000 mi

Symptoms: Severe clunking when shifting from Park to Drive, Excessive driveline vibration under acceleration, Shifter feels notchy or misaligned, Visible transmission sag when inspecting from below

Fix: The rear transmission mount (also called transfer case mount on AWD) is hydraulic-filled and fails regularly. Rubber tears and fluid leaks out. Requires lifting transmission slightly - typically 3-4 hours labor. Genuine Mitsubishi mount is $250-400, aftermarket $120-200 but shorter lifespan.

Estimated cost: $450-800

Typical onset: 100,000+ mi

Symptoms: ATF puddles under engine bay center, Transmission overheating warnings or limp mode, Burnt ATF smell, Rapid ATF loss leading to shift flare or slipping

Fix: Steel cooler lines rust through where they pass frame rails, or rubber hoses crack at crimp fittings. If caught early, line replacement is 2-3 hours. If transmission ran low on fluid, internal damage may require rebuild. Lines are $150-300, but labor varies wildly depending on which line fails and access.

Estimated cost: $400-900

Typical onset: 120,000-180,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible leaks, Overheating under boost, Chocolate milk appearance in oil cap, Bubbles in coolant reservoir with engine running

Fix: The 6G72TT head gaskets fail between cylinders or into coolant passages, especially on cars with boost modifications or overheating history. Requires removing turbos, exhaust manifolds, intake plenum - easily 20-28 hours labor. Must machine heads (often warped $300-600) and replace all head bolts. Many shops won't touch this job.

Estimated cost: $4,500-7,500

Typical onset: Any age - time-based degradation

Symptoms: Rough idle and stalling, Check engine light with lean codes (P0171/P0174), Boost gauge reads lower than expected, Hissing sounds under hood during acceleration, Active Aero or ECS systems not functioning

Fix: 25-year-old rubber vacuum lines crack and collapse. This car has 30+ vacuum lines controlling turbos, EGR, idle air, active aero, and exhaust. Diagnosis is tedious - expect 4-6 hours to trace all lines and replace problem sections. No single kit exists; techs buy bulk line and remake connections. Parts are cheap ($50-150) but labor-intensive.

Estimated cost: $500-1,200

Typical onset: All ages

Symptoms: Rear spoiler won't deploy or stuck up, 4WS warning light illuminated, Steering feels vague or rear end twitchy, Grinding noise from rear steering actuator

Fix: Active aero motor and 4-wheel steering actuators fail from age. Rear spoiler can be manually fixed or disabled (cosmetic issue). 4WS failure causes light but car remains drivable - many owners simply disconnect system. OEM parts are NLA; used JDM parts or delete kits are common. Rear steering actuator replacement is 6-8 hours if pursued.

Estimated cost: $800-2,000