1991 ISUZU RODEO

Typical onset: 80,000-150,000 mi

Symptoms: Rod knock or bottom-end rattling at idle, Low oil pressure warning even with full crankcase, Metal shavings in oil filter during changes, Sudden loss of power followed by seized engine

Fix: The 3.2L V6 suffers from inadequate oil flow to main and rod bearings, especially if oil changes are extended. Once knock starts, you're looking at either a complete engine rebuild (pistons, rings, bearings, crank polishing, head gaskets) requiring 25-35 hours, or a used/reman engine swap at 18-22 hours. Rebuilds often reveal scored crankshafts requiring replacement.

Estimated cost: $3,500-6,500

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid pooling under vehicle at front, Rapid fluid loss leading to slipping or no engagement, Pink or red fluid visible near radiator area, Sudden transmission failure after suspected coolant leak

Fix: The steel cooler lines running to the radiator rust through, causing catastrophic fluid loss. If coolant mixes with ATF through a ruptured internal cooler, the transmission is often destroyed (strawberry milkshake effect). Caught early, line replacement is 2-3 hours. If the trans is contaminated, you're replacing it (12-15 hours) plus flushing the cooling system.

Estimated cost: $200-400 (lines only); $2,200-3,200 (transmission replacement)

Typical onset: 60,000-100,000 mi

Symptoms: Clunking when shifting from park to drive or reverse, Excessive vibration through floorboards at idle in gear, Visible transmission sag when inspected from below, Shifter feels imprecise or notchy

Fix: The rubber transmission mount deteriorates and tears, allowing excessive drivetrain movement. Replacement is straightforward but requires supporting the transmission while swapping the mount. Budget 1.5-2 hours labor. Often replaced alongside motor mounts during the same visit.

Estimated cost: $150-300

Typical onset: 100,000-140,000 mi

Symptoms: White smoke from exhaust on cold starts, Coolant loss with no visible external leaks, Oil cap shows milky residue, Overheating or fluctuating temp gauge, Bubbles in coolant reservoir with engine running

Fix: The 3.2L V6 head gaskets eventually fail, often on both banks simultaneously. Proper repair requires removing both heads, milling them flat, new gaskets, and new head bolts. Also requires timing belt replacement while you're in there. Count on 18-22 hours labor. If heads are warped beyond spec, add $300-500 for machine work.

Estimated cost: $2,800-4,200

Symptoms: Hard starting after sitting overnight, Hesitation or stumbling under acceleration, Engine dies at idle when warm, Loss of power at highway speeds

Fix: The in-line fuel filter gets neglected and clogs, especially if tank sediment is present. On this platform, the filter is easily accessible under the vehicle near the fuel tank. Replacement takes 0.5 hours. If the pump is also failing (common at 120k+), pump replacement is 2-3 hours.

Estimated cost: $80-150 (filter); $400-650 (pump)

Symptoms: Headlights or taillights intermittently failing, Turn signals not working on one side, Corrosion visible in bulb sockets, Dash warning lights for exterior lighting

Fix: There was an NHTSA recall for exterior lighting issues related to faulty wiring or connectors. Even post-recall, corrosion in lamp sockets and failing multifunction switches cause problems. Diagnosis and repair vary: socket replacement is 0.5 hours per corner; multifunction switch is 1-1.5 hours.

Estimated cost: $100-350