1990 ROLLS-ROYCE SILVER SPIRIT

Typical onset: 60,000-100,000 mi

Symptoms: Vehicle sagging at one or more corners, Suspension compressor running constantly, Rough ride quality, Warning light illuminated

Fix: Accumulator spheres fail first (good for 7-10 years), then hydraulic lines crack and leak. Height corrector valves seize. Full system refresh with accumulators, lines, and strut seals runs 16-20 hours labor. Replacing all four struts adds another 8-12 hours.

Estimated cost: $3,500-7,500

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid in coolant or vice versa, Harsh shifting when hot, Pink milkshake residue in expansion tank, Transmission overheating

Fix: GM TH400-based transmission shares cooling with engine. Internal cooler fails, cross-contaminating fluids and destroying transmission. Requires cooler replacement (4-6 hours), complete fluid flush, and often transmission rebuild if contamination occurred. Always replace cooler proactively during any transmission work.

Estimated cost: $800-1,200 for cooler alone; $4,500-7,000 with transmission rebuild

Symptoms: Intermittent no-start conditions, Random electrical gremlins, Check engine light, Instruments reading erratically, Corrosion visible at connectors

Fix: Lucas wiring from this era uses biodegradable insulation that literally crumbles after 25-30 years. Engine bay harness replacement requires 12-16 hours and meticulous labeling. Main harness under dash adds another 20+ hours. Many owners opt for targeted repairs of problem circuits rather than full replacement.

Estimated cost: $1,800-3,500 for engine harness; $5,000-8,000 for complete vehicle rewire

Typical onset: 80,000-140,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Oil in coolant, Overheating, Rough idle

Fix: The 6.75L V8 uses aluminum heads on iron block. Gaskets fail from age and thermal cycling. Job requires heads off (8-10 hours per side), surface inspection, and often valve work. Replace coolant hoses, water pump, and thermostat while in there. Budget 24-30 hours total labor.

Estimated cost: $4,500-7,500

Typical onset: 60,000-90,000 mi

Symptoms: Hard brake pedal requiring excessive pressure, Brake pump running continuously, Loss of power assist, Pedal pulsation, Extended stopping distances

Fix: Hydraulic brake system uses pressurized accumulator sphere (similar to suspension). Nitrogen charge bleeds off over 7-10 years. Brake pump compensates until it fails. Sphere replacement is 2-3 hours, but pump failure adds 4-6 hours. Always replace sphere proactively; waiting risks complete brake failure.

Estimated cost: $800-1,500 for sphere; $2,200-3,500 with pump

Symptoms: Fuel smell in cabin or garage, Visible fuel weeping at connections, Hard starting when hot, Fuel pressure loss, Fire risk

Fix: Rubber fuel lines throughout system age out after 30 years. Under-hood lines crack first, followed by chassis lines. Full fuel system line replacement (all rubber sections) takes 8-12 hours. This is non-negotiable preventive maintenance on any car this old.

Estimated cost: $1,200-2,200

Typical onset: Any age/mileage

Symptoms: No heat or A/C, Blower motor inoperative, Temperature fluctuations, Automatic system stuck in one mode, Vacuum leaks affecting blend doors

Fix: Complex automatic climate system uses vacuum actuators that leak, and electronic control modules that fail. Diagnosis is time-consuming (2-4 hours). Blend door actuator replacement requires dash removal (12-16 hours). Control module repair/replacement adds 3-5 hours. Many specialists rebuild modules since NLA.

Estimated cost: $800-1,500 for vacuum repairs; $2,500-4,500 for dash-out work