2005 DAIHATSU COPEN

Typical onset: 60,000-100,000 mi

Symptoms: Loud ticking or tapping from valve cover, especially cold start, Loss of power under boost, Check engine light with misfire codes, Metallic rattle at idle

Fix: Lifters wear due to small oil passages and aggressive cam profiles in this high-revving turbo motor. Requires cylinder head removal (3.5-4.5 hours), lifter replacement, valve adjustment, and often camshaft inspection. Head gasket replacement typically done simultaneously since you're already there. Many shops recommend full head resurface while apart.

Estimated cost: $1,800-3,200

Typical onset: 70,000-120,000 mi

Symptoms: White smoke from exhaust on startup, Coolant loss with no visible leaks, Oil contamination in coolant reservoir, Overheating under boost or hard driving, Rough idle and misfires

Fix: The JB-DET runs high cylinder pressures in a tiny bore, and OEM gaskets fail predictably. Requires head removal (4-5 hours), resurfacing the head (common due to warpage), new gasket set, timing belt while you're in there, and coolant system flush. Access is tight in the Copen's chassis.

Estimated cost: $2,200-3,800

Typical onset: 80,000-130,000 mi

Symptoms: ATF drips under engine bay, Transmission slipping or delayed engagement when hot, Burnt ATF smell, Low transmission fluid warnings if equipped

Fix: Cooler lines and fittings corrode from road salt and age, especially on JDM imports. The cooler itself can crack from heat cycling. Replacement involves dropping undertray, accessing tight fittings (1.5-2 hours), flushing system, and refilling with fresh ATF. Often paired with transmission mount replacement due to access.

Estimated cost: $450-900

Typical onset: 90,000-140,000 mi

Symptoms: Severe vibration at idle and under load, Squealing or grinding from front of engine, Visible wobble on crankshaft pulley, Accessory belt tracking issues or rapid belt wear

Fix: The rubber bonding in the balancer separates, causing the outer ring to slip or separate entirely. This can lead to catastrophic timing belt failure if the pulley separates. Replacement requires serpentine belt removal and pulley puller (2-2.5 hours). Critical to check during timing belt service.

Estimated cost: $550-950

Typical onset: 70,000-110,000 mi

Symptoms: Clunking on acceleration or deceleration, Excessive drivetrain movement visible from engine bay, Vibration through shifter and floorboard, Difficulty engaging gears smoothly

Fix: The front and rear transmission mounts tear and collapse from age and the engine's turbo torque pulses. Requires jacking transmission (1-1.5 hours), replacing mounts, and realignment. Often done alongside oil cooler service since access overlaps.

Estimated cost: $320-600

Typical onset: 100,000-150,000 mi

Symptoms: Progressive loss of power especially in high RPM range, Persistent lifter noise even after replacement, Poor fuel economy, Rough idle with multiple misfires

Fix: Inadequate oil changes or wrong oil weight accelerates cam wear on this high-pressure valvetrain. Requires head removal, cam replacement, new lifters, timing belt, and often head resurfacing (5-7 hours total). Not repairable — cam must be replaced. Parts availability from Japan can delay repairs.

Estimated cost: $2,800-4,500