1995 CHEVROLET IMPALA SS

Typical onset: 60,000-100,000 mi

Symptoms: no-start or intermittent stalling, rough idle and misfire, bucking under load, typically fails when wet or after coolant leaks

Fix: Replace Optispark distributor assembly. Requires water pump removal for access. 4-6 hours labor. Use vented aftermarket unit to prevent repeat failures from moisture ingress.

Estimated cost: $800-1,400

Typical onset: 80,000-140,000 mi

Symptoms: slipping between 1st-2nd shift, delayed engagement into gear, harsh 2-3 shift or flare, transmission overheating, no 3rd or 4th gear

Fix: 3-4 clutch pack and servo bore wear are typical culprits. Rebuild requires 8-12 hours labor, includes new clutches, bands, servos, and updated servo bore sleeve. Many shops recommend auxiliary cooler add-on.

Estimated cost: $1,800-2,800

Symptoms: overheating under load, steam from exhaust on startup, coolant loss with no visible leak, milky oil from internal head gasket leak

Fix: LT1 flows coolant through heads first, making them prone to steam pockets and head gasket failure between cylinder and water jacket. Repair involves head gasket replacement on one or both sides, head resurfacing, new head bolts. 10-14 hours labor.

Estimated cost: $1,500-2,500

Typical onset: 90,000-130,000 mi

Symptoms: stumbling under hard acceleration, loss of power at highway speeds, long crank before starting, fuel pump whine audible in cabin

Fix: Factory in-tank pump and inline filter can clog from age and sediment. Pump replacement requires dropping the fuel tank. 2.5-4 hours labor. Replace both pump and external filter together.

Estimated cost: $500-900

Typical onset: 80,000-120,000 mi

Symptoms: transmission fluid puddle under front of car, burnt smell from fluid dripping onto exhaust, low trans fluid warnings, quick drops in fluid level

Fix: Steel lines rust at radiator fittings and along frame. Replace both feed and return lines, often necessitates radiator removal for access. 3-5 hours labor. Inspect radiator for internal cross-contamination.

Estimated cost: $400-700

Typical onset: 100,000+ mi

Symptoms: oil spots on driveway centered under bellhousing, oil accumulation on transmission bellhousing, oil drips from rear of engine, visible seepage around pan rail

Fix: LT1 two-piece rear main seal leaks frequently. Requires transmission removal for rear main, 6-8 hours. Oil pan gasket can be done with engine in car but clearance is tight, 4-6 hours. Often done together.

Estimated cost: $800-1,500

Typical onset: 120,000-180,000 mi

Symptoms: excessive oil consumption (1 qt per 500-1000 mi), blue smoke on startup or under load, loss of compression, fouled spark plugs, knocking or rattling from bottom end

Fix: High-mileage or abused engines suffer ring land failure and bore scoring, often combined with rod bearing wear. Requires engine removal, bore/hone, new pistons, rings, bearings. 25-35 hours labor. Many opt for reman short block instead.

Estimated cost: $4,500-7,000