1971 PLYMOUTH SEBRING

Typical onset: 80,000-120,000 mi or 40+ years age

Symptoms: rattling noise from front of engine at startup, rough idle and poor performance, backfiring through carburetor, difficulty starting when hot, check timing reveals 10+ degrees retarded from spec

Fix: Replace timing chain, gears, and tensioner. Budget 6-8 hours labor for front cover removal, new gaskets, oil pan reseal (often necessary for access), and new timing set. Original nylon-toothed cam gears deteriorate even on low-mileage engines due to age. Use double-roller aftermarket chain.

Estimated cost: $800-1,400

Symptoms: rough idle and stalling when cold, fuel leaking from base or accelerator pump, black smoke under acceleration, surging at highway speeds, fuel smell in garage after sitting

Fix: Complete rebuild with modern ethanol-compatible gaskets and seals. Accelerator pump diaphragms harden, floats sink from old fuel eating cork, and power valve failures are common on Holleys. Figure 3-4 hours for removal, disassembly, ultrasonic cleaning, rebuild, and proper tuning. Carter AVS rebuilds are more involved.

Estimated cost: $450-750

Symptoms: overheating in traffic or on highway, coolant weeping from water pump weep hole, bulging or cracked hoses, rusty coolant, heater core leaking onto passenger floor

Fix: Original copper/brass radiators often clogged or leaking. Expect 4-5 hours for radiator re-core or replacement, plus another 2-3 hours for water pump, thermostat, and all hoses. Many shops recommend doing it all at once on 50-year-old cars. Heater core replacement adds 6-8 hours (dash removal).

Estimated cost: $1,200-2,200

Typical onset: 70,000+ mi or any age with dried seals

Symptoms: oil puddle under back of engine after sitting, oil coating bellhousing and starter, burning oil smell from clutch or flexplate area, drips increase after highway driving

Fix: Transmission removal required. Budget 8-10 hours for manual, 6-8 for automatic. Original rope seal or early neoprene two-piece seals dry out and leak. Upgrade to modern one-piece seal during repair. Many techs also replace oil pan gasket and front seal while transmission is out.

Estimated cost: $900-1,600

Typical onset: 60,000-100,000 mi or rust-belt vehicles

Symptoms: clunking over bumps from front end, uneven ride height side-to-side, excessive front-end sag, torsion bar adjusters maxed out, creaking noises when turning from stop

Fix: Torsion bar anchor bushings and sockets wear or rust out. Requires front suspension disassembly, torsion bar removal, socket replacement if corroded. Count on 4-6 hours per side if sockets need replacement, less if just bushings. Often discover other worn suspension components during this job.

Estimated cost: $600-1,100

Symptoms: intermittent no-start when hot, sudden stalling with no warning, misfiring under load, starts fine cold, dies after 20 minutes, no spark at coil

Fix: Many 1971s were retrofitted with Mopar electronic ignition (or aftermarket). Control modules and pickup coils fail, often heat-related. Diagnosis takes 1-2 hours, replacement another 1-2 hours. Keep spare ECU in glovebox on road trips. Points-style distributors are actually more reliable if maintained, consider converting back.

Estimated cost: $250-500

Symptoms: soft or spongy brake pedal, pedal slowly sinks to floor under steady pressure, fluid leaks at wheels or under master cylinder, pulling to one side during braking, fluid reservoir constantly low

Fix: Rubber seals deteriorate over time regardless of miles. Master cylinder rebuild or replacement takes 2-3 hours including bench bleeding. Wheel cylinders add 1-2 hours each, often all four need attention simultaneously. Many shops refuse to rebuild old cylinders and insist on new units. Complete brake system overhaul recommended on barn-find cars.

Estimated cost: $800-1,400