1996 CHEVROLET IMPALA SS

Typical onset: 60,000-120,000 mi

Symptoms: No-start condition, especially in wet weather, Intermittent stalling or misfire, Check Engine light with random misfire codes, Hard starting when engine is hot

Fix: The Optispark distributor sits low behind the water pump on the LT1, making it vulnerable to coolant and road spray. Requires water pump removal to access. Budget 4-5 hours labor. Always replace with quality unit (AC Delco or MSD) and address any coolant leaks simultaneously. Many techs also replace water pump while in there.

Estimated cost: $800-1,400

Typical onset: 80,000-150,000 mi

Symptoms: Transmission fluid leaking from radiator area, Pink fluid in coolant reservoir (cross-contamination), Sudden transmission failure after coolant mixing, Burnt transmission fluid smell

Fix: Steel cooler lines rust through at fittings or the internal radiator cooler fails, causing fluid cross-contamination. Contaminated transmission requires full fluid flush or rebuild. Prevention: replace lines and add external cooler. Line replacement is 2-3 hours; if contamination occurred, transmission rebuild is 8-12 hours.

Estimated cost: $300-500 for lines only, $1,800-3,000 if transmission damaged

Typical onset: 120,000-180,000 mi

Symptoms: Excessive oil consumption (1 quart per 500-1,000 miles), Blue smoke on startup or acceleration, Fouled spark plugs, Loss of compression on cylinder test

Fix: LT1 engines develop carbon buildup on piston ring lands, causing rings to stick and lose seal. Requires engine removal and teardown. Most shops recommend full rebuild with new rings, hone, bearings, and gaskets. 20-25 hours labor. Some owners attempt top-end jobs (heads/rings only) but full rebuild is more reliable long-term fix.

Estimated cost: $3,500-5,500

Typical onset: 70,000-120,000 mi

Symptoms: Clunking when shifting from Park to Drive, Vibration at idle in gear, Excessive driveline movement during acceleration, Visible torn or collapsed mount rubber

Fix: The rubber portion of the transmission crossmember mount deteriorates, causing driveline slop. Simple job: 1-1.5 hours on a lift. Replace with OEM or polyurethane upgrade. Polyurethane adds slight NVH but lasts longer.

Estimated cost: $150-300

Typical onset: 100,000-150,000 mi

Symptoms: No-start or intermittent stalling, Loss of power under load, Whining noise from fuel tank, Inaccurate or dead fuel gauge

Fix: Factory pump and sending unit wear out. Tank must be dropped for access on B-body. 3-4 hours labor. Replace pump, strainer, and sending unit as assembly. Fuel gauge issues often stem from corroded sending unit contacts rather than gauge itself.

Estimated cost: $600-900

Typical onset: 90,000-140,000 mi

Symptoms: Power steering fluid leak at gearbox seals, Groaning when turning at low speed, Loose or wandering steering feel, Fluid level drops requiring frequent top-off

Fix: The recirculating ball steering box develops seal leaks, especially input shaft seal. Rebuilding is possible but most shops replace with reman unit. 3-4 hours labor includes alignment. High-mileage boxes may have internal wear causing slop even after seal replacement.

Estimated cost: $500-900