The 1977 AMC Pacer is a quirky compact known for its fishbowl greenhouse and surprisingly wide body. Mechanically, it shares AMC's durable inline-six engines, but transmission cooling issues and engine oil consumption from worn rings plague higher-mileage examples.
Transmission Overheating and Cooler Line Failures
Common · high severityTypical onset: 70,000-110,000 mi
Symptoms: Slipping or delayed shifts when hot, Burnt transmission fluid smell, Fluid leaking from cooler lines at radiator, Transmission temp warning or erratic behavior in traffic
Fix: Factory cooler setup is marginal—lines corrode and the in-radiator cooler clogs. Replace cooler lines, flush system, add auxiliary cooler if towing or hot climate. 3-4 hours labor plus cooler and fluid.
Estimated cost: $400-750
Excessive Oil Consumption from Worn Piston Rings
Common · medium severityTypical onset: 100,000-150,000 mi
Symptoms: Blue smoke on startup or acceleration, Needing a quart every 500-800 miles, Fouled spark plugs, Low compression on one or more cylinders
Fix: AMC sixes are tough but ring wear is inevitable. Ring job requires head and pan removal—expect 12-16 hours labor. Often done with valve job and bearings while you're in there. If cylinders are scored, overbore and pistons add cost.
Estimated cost: $1,800-3,200
Automatic Transmission Rebuild (TorqueFlite 904/998)
Occasional · high severityTypical onset: 120,000-160,000 mi
Symptoms: Hard or no upshifts, Slipping in any gear, No reverse or forward movement, Metal shavings in pan during fluid change
Fix: Chrysler TorqueFlite used in '77 Pacer is generally robust, but neglected fluid and overheating kill clutches and bands. Full rebuild with torque converter: 10-14 hours labor, master kit, and converter. Sometimes valve body cleaning buys time.
Estimated cost: $1,600-2,800
Crankshaft Main and Rod Bearing Wear
Occasional · high severityTypical onset: 140,000+ mi
Symptoms: Deep knocking from bottom end on cold start, Oil pressure drops at idle when hot, Metallic debris in oil filter, Sudden loss of oil pressure
Fix: AMC sixes can chew bearings if oil changes were skipped or wrong oil used. Crank must be pulled, measured, possibly turned or replaced. Plan 18-24 hours labor—nearly a full engine rebuild. If crank is damaged, expect machine shop charges.
Estimated cost: $2,200-4,000
Fuel System Varnish and Clogged Filters
Common · low severitySymptoms: Hesitation or stumbling under load, Hard starting after sitting, Stalling in traffic, Poor idle quality
Fix: Ethanol fuel and long storage periods gum up carburetors and lines. Replace inline fuel filter every 10k miles, rebuild or replace carburetor if it's been sitting. Filter is 0.5 hour, carb rebuild 2-3 hours if off the car.
Estimated cost: $25-450
Transmission Mount Failures
Occasional · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Clunking when shifting into gear, Excessive driveline vibration, Transmission tail visibly sagging, Shifter feel sloppy or misaligned
Fix: Rubber mount collapses from age and heat. Jack up transmission, unbolt old mount, swap in new. 1-2 hours labor, cheap part. Inspect crossmember for rust while you're under there.
Estimated cost: $120-250
Buy one if you want quirky style and can wrench—parts are cheap and the I6 is unkillable if you stay ahead of oil consumption and keep the transmission cool.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.