2000 ISUZU GEMINI

Typical onset: 90,000-140,000 mi

Symptoms: loud ticking or tapping at idle, especially when cold, noise diminishes after warm-up but returns, gradual loss of power under acceleration, check engine light may appear with misfire codes

Fix: Requires cylinder head removal to replace all lifters/tappets, typically 6-8 hours labor. Often combined with camshaft inspection and valve adjustment. Head resurfacing adds another 2-3 hours if warpage is found during removal, which is common on high-mileage units that overheated even once.

Estimated cost: $800-1,400

Typical onset: 110,000-160,000 mi

Symptoms: white smoke from exhaust on startup, coolant loss with no visible leaks, oil appears milky or frothy on dipstick, overheating in traffic or highway driving, bubbling in coolant reservoir when engine running

Fix: Head gasket replacement requires 8-10 hours including head removal, cleaning, resurfacing (almost always necessary), and reassembly. Smart shops replace the camshaft seal, valve cover gasket, and check lifters while they're in there. If cylinder head is cracked (rare but happens), add $400-600 for used head.

Estimated cost: $1,200-2,000

Typical onset: 70,000-110,000 mi

Symptoms: clunking when shifting from park to drive or reverse, excessive vibration at idle in gear, visible engine/trans movement when revving in neutral, grinding or rubbing sensation during acceleration

Fix: Front and rear transmission mounts fail from age and oil contamination. Replacement is 1.5-2 hours for both mounts. Original rubber degrades faster in hot climates. This is a wear item that should be inspected at every major service after 60k miles.

Estimated cost: $250-450

Typical onset: 120,000-180,000 mi

Symptoms: visible wobble of crankshaft pulley when engine running, serpentine belt shredding or walking off pulleys, rough idle with vibration through chassis, squealing from front of engine that changes with RPM

Fix: The rubber isolation ring separates from the hub, causing dangerous wobble. Requires harmonic balancer puller and installer tools, 2-3 hours labor. If ignored, can damage crankshaft snout or timing components. Not a DIY job without proper tools—pullers can crack the balancer if misused.

Estimated cost: $350-600

Typical onset: 140,000+ mi

Symptoms: severe valve train noise that doesn't quiet after warm-up, loss of power especially at low RPM, rough idle and poor fuel economy, metal shavings visible in oil during changes

Fix: Caused by extended oil change intervals or low oil running. Requires cylinder head removal, camshaft replacement, and typically all new lifters. Expect 8-10 hours labor minimum. If rocker arms or cam journals are scored, add cylinder head replacement to the bill—this becomes an engine-out situation.

Estimated cost: $1,400-2,200

Symptoms: transmission fluid puddles under front of vehicle, pink or red fluid visible on cooler lines near radiator, transmission slipping or delayed engagement when fluid level drops, burnt smell from transmission area

Fix: Steel cooler lines rust through at bends and connections, especially in salt-belt areas. Line replacement is 1-1.5 hours plus fluid refill and system flush (recommended). Prevent by inspecting annually and treating with rust inhibitor. Ignored leaks lead to transmission failure within 500-1000 miles.

Estimated cost: $200-400