1992 TOYOTA PREVIA

Typical onset: 80,000-150,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Overheating under load, Milky oil on dipstick or filler cap

Fix: Both head gaskets typically fail due to supercharger heat and EGR system carbon buildup. Access requires removing driver's seat, center console, and doghouse. Heads should be pressure-tested and decked. 14-18 hours labor for competent tech, more if you've never done one. Always replace timing belt, water pump, and all coolant hoses while you're in there.

Estimated cost: $2,800-4,500

Typical onset: 120,000-180,000 mi

Symptoms: Rod knock on cold start that may quiet when warm, Low oil pressure at idle, Metallic rattling under acceleration, Metal shavings in oil filter

Fix: Rod bearings wear prematurely, especially if oil changes were stretched. Once you hear knock, it's too late—needs full short block or engine replacement. Same brutal access as head gaskets. Many shops quote engine-out R&R (20-24 hours) rather than in-chassis rebuild. Used low-mileage JDM engines run $1,200-2,000 plus 18-22 hours install.

Estimated cost: $3,500-5,500

Typical onset: 100,000-160,000 mi

Symptoms: ATF dripping near front axle area, Transmission slipping after highway runs, Burnt ATF smell, Low fluid level on dipstick

Fix: Steel cooler lines rust through where they pass near subframe. Lines run alongside engine in tight quarters—plan on 4-6 hours to drop crossmember for proper access. Some techs splice in rubber hose which fails again in 2 years; do it right with new steel lines. Flush cooler and transmission if ATF was low.

Estimated cost: $600-1,100

Typical onset: 90,000-140,000 mi

Symptoms: Hard starting when hot, Stumbling or hesitation under load, Loss of power on hills, Intermittent stalling

Fix: In-tank fuel pump strainer clogs with varnish; external fuel filter also gets overlooked. Filter is under vehicle mid-body, 0.5-1.0 hour job. If strainer is clogged, tank must drop (3-4 hours) and pump assembly replaced. Many Previas went years without filter service. Change filter every 30k as preventive.

Estimated cost: $150-250 filter only, $650-950 with pump

Typical onset: 80,000-120,000 mi

Symptoms: Clunk when shifting from Park to Drive, Vibration at idle in gear, Excessive engine movement visible from driver seat area, Shifter feels loose or notchy

Fix: Rear transmission mount (under driver's area) is hydraulic and fails from age. Engine rocks excessively and stresses other mounts and axles. Requires raising engine slightly; 2-3 hours labor. Replace all three engine/trans mounts as a set if vehicle is over 15 years old.

Estimated cost: $400-700

Typical onset: 60,000-110,000 mi

Symptoms: Rough idle when warm, Check engine light with EGR codes, Pinging or detonation under load, Poor fuel economy

Fix: EGR passages in intake manifold and heads clog with carbon, causing valve to stick and unmetered air leaks. Eventually contributes to head gasket failure. Proper fix requires manifold removal (8-10 hours due to access) and manual cleaning of passages. Many shops just replace EGR valve ($120 part) which doesn't solve root cause.

Estimated cost: $180-350 valve only, $1,200-1,800 full cleaning