2000 ISUZU TROOPER

Typical onset: 80,000-150,000 mi

Symptoms: excessive oil consumption (1+ quart per 500-1000 miles), blue smoke on startup or acceleration, loss of compression in one or more cylinders, check engine light with misfire codes, eventually complete engine seizure

Fix: The 3.5L DOHC V6 is notorious for piston ring land failure where the top ring groove cracks and collapses. Once oil consumption starts, it accelerates rapidly. Only real fix is engine replacement or full rebuild with aftermarket pistons. Rebuild requires 25-35 hours labor, machine work, and complete gasket set. Most shops recommend used low-mileage JDM engine swap (15-20 hours) as more cost-effective.

Estimated cost: $4,500-7,500

Typical onset: 60,000-120,000 mi

Symptoms: milky pink transmission fluid, strawberry milkshake appearance in coolant reservoir, transmission slipping or delayed engagement, overheating transmission, engine overheating

Fix: The cooler lines running through the radiator develop internal failures allowing ATF and coolant to mix. This destroys the transmission within days if not caught immediately. Requires radiator replacement, complete transmission fluid flush with filter and pan service (sometimes multiple flushes), and new cooler lines. If contamination ran for any length of time, transmission rebuild/replacement is mandatory. Prevention: install external transmission cooler and bypass radiator cooler. 4-6 hours labor for radiator and lines, add 8-12 hours if transmission needs replacement.

Estimated cost: $800-1,200 (caught early) or $3,500-5,000 (transmission damaged)

Typical onset: 75,000-100,000 mi intervals

Symptoms: squealing or grinding noise from timing cover, coolant leak from weep hole on water pump, engine overheating, catastrophic engine damage if belt fails

Fix: This is an interference engine - belt failure means bent valves minimum. The idler pulley bearing fails prematurely, and water pumps leak. Timing belt service requires 5-7 hours and should include belt, tensioner, idler pulley, water pump, thermostat, and all seals. Critical to do every 60,000 miles regardless of what manual says due to pulley bearing issues.

Estimated cost: $800-1,400

Typical onset: 70,000-130,000 mi

Symptoms: clunk when shifting from park to drive or reverse, vibration at 40-50 mph or under acceleration, visible transmission sag when inspected on lift, exhaust rattles against crossmember

Fix: The rear transmission mount deteriorates and allows excessive drivetrain movement. Creates vibrations throughout the vehicle and can damage exhaust components. Requires dropping the transfer case slightly to replace. Also inspect front engine mounts at same time as they typically fail around same mileage. 2-3 hours labor for transmission mount, add 1 hour if doing both engine mounts simultaneously.

Estimated cost: $350-600

Typical onset: 100,000-180,000 mi

Symptoms: hard starting especially when hot, stalling at idle or during deceleration, hesitation under acceleration, fuel smell from vacuum line to regulator, check engine light with fuel trim codes

Fix: The in-tank fuel pump weakens with age causing low pressure and hot-start problems. The fuel pressure regulator diaphragm can rupture, dumping raw fuel into the intake via vacuum line. Pump replacement requires dropping the tank (3-4 hours). Regulator is easier at 1.5 hours. Test fuel pressure first: should see 41-46 PSI with key on, engine off.

Estimated cost: $500-900 (pump) or $200-350 (regulator)

Typical onset: 90,000+ mi

Symptoms: check TOD light illuminated, 4WD indicator lights flashing, loss of 4WD engagement, clunking from transfer case, fluid leak from transfer case

Fix: The electronically-controlled 4WD system uses a clutch pack that can fail, and the control module is prone to corrosion. Clutch replacement requires transfer case disassembly (8-10 hours). Control module issues may just need cleaning/resealing (1-2 hours). Many owners just run in 2WD and ignore the light. Check transfer case fluid level and condition first - often neglected and causes premature wear.

Estimated cost: $400-800 (module) or $1,800-2,800 (clutch pack)