2000 CHEVROLET IMPALA

Typical onset: 60,000-120,000 mi

Symptoms: White smoke from exhaust on cold start, Coolant loss with no external leaks, Milky oil or chocolate milkshake dipstick, Rough idle, misfires, or sudden no-start after sitting, Hydrolocked engine if driven with coolant in cylinders

Fix: Replace lower intake gaskets with updated Fel-Pro 1250 or Dorman 615-178 (metal carrier design), upper plenum gaskets, coolant flush, possibly spark plugs if fouled. If coolant entered cylinders and owner kept driving, expect rod bearing damage requiring engine rebuild or replacement. Job takes 4-6 hours if caught early, 20-40+ hours for full rebuild.

Estimated cost: $600-1,200 for gaskets alone, $2,500-4,500 for short block replacement if internals damaged

Typical onset: 80,000-150,000 mi

Symptoms: Harsh 1-2 or 2-3 shifts, then slipping, Delayed engagement into Drive or Reverse, Shudder or flare on 3-4 upshift, Burnt ATF smell, dark red or brown fluid, Check Engine light with P0730 incorrect gear ratio codes

Fix: Common failures are 2nd gear band, 3-4 clutch pack, and pressure control solenoid. Fluid and filter service can buy time if caught early (2 hours), but most need rebuild or reman unit. R&R is 8-12 hours. Transmission cooler lines and radiator-internal cooler often fail too, contaminating fresh fluid—replace external cooler during trans job.

Estimated cost: $1,800-3,200 for rebuild with torque converter, $2,500-3,800 for reman exchange

Typical onset: 70,000-130,000 mi

Symptoms: Random misfires, typically worse when hot, Stalling at idle or under load, No-start with crank but no spark, Check Engine light with P0300-P0306 misfire codes, Intermittent stumble that clears after cooling

Fix: ICM mounts under coil packs and fails from heat cycling. Replace ICM, coil pack towers (three dual-tower assemblies on 3.8L, two on 3.4L), and plug wires as a set. On 3.8L, access requires removing upper plenum. 2-3 hours labor.

Estimated cost: $400-700

Typical onset: 100,000-180,000 mi

Symptoms: Blue smoke on startup or acceleration, Low oil light between changes (1 qt per 500-1,000 mi), Fouled spark plugs, repeated P0300 codes, Carbon buildup on valves and intake, Low compression on multiple cylinders

Fix: Ring land failure or ring flutter from carbon buildup. Top-end work (rings, hone, valve seals) takes 12-16 hours, but many 3.8L engines are worn enough that short block replacement is more cost-effective. Some techs try high-mileage oil additives or piston soak treatments first.

Estimated cost: $1,200-2,000 for rings and valve seals, $2,800-4,200 for short block

Typical onset: 80,000-130,000 mi

Symptoms: Clunking over bumps from front end, Steering wander or vague on-center feel, Inner or outer edge tire wear, Vibration at highway speed, Creaking when turning into driveway

Fix: Front lower control arms have pressed bushings and riveted ball joints—replace whole arms rather than pressing. Alignment required. 3-4 hours for both sides.

Estimated cost: $500-800 including alignment

Typical onset: 90,000-150,000 mi

Symptoms: No-start with crank, no fuel pressure, Intermittent stalling when fuel tank below 1/4, Whining or buzzing from rear seat area, Hesitation or stumble under acceleration, Long crank before starting when hot

Fix: Drop tank, replace pump assembly and strainer. Check fuel pressure regulator and feed/return lines while tank is down. 3-4 hours labor.

Estimated cost: $500-750

Typical onset: 60,000+ mi

Symptoms: Clunk or pop felt through steering wheel over bumps, Noise when turning at low speed in parking lots, No effect on steering function

Fix: Upper and lower intermediate shaft U-joints wear and develop slop. Replace intermediate shaft assembly. 1.5 hours labor, alignment not required.

Estimated cost: $250-400