1983 BUICK SKYLARK

Typical onset: 60,000-100,000 mi

Symptoms: Slipping between gears, especially 2nd to 3rd, Delayed engagement when shifting from Park to Drive, Shuddering or harsh shifts under moderate throttle, Complete loss of forward gears leaving only reverse

Fix: Rebuild or replacement required. Internal clutch pack wear and valve body issues are typical. Expect 8-12 hours labor for R&R and rebuild. Transmission mounts often need replacement simultaneously due to excessive movement from failing trans.

Estimated cost: $1,200-2,200

Typical onset: 40,000-80,000 mi

Symptoms: Excessive white or blue smoke from exhaust, Severe loss of compression in multiple cylinders, Knocking or rattling from lower end, Oil contamination in coolant or vice versa, Complete seizure in worst cases

Fix: This Oldsmobile-built diesel is fundamentally flawed with weak block castings, inadequate head bolts, and poor injector pump reliability. Most require complete engine replacement or full rebuild including block work. 16-24 hours labor for R&R plus machine work. Many owners convert to gasoline engine.

Estimated cost: $3,500-6,500

Typical onset: 100,000-150,000 mi

Symptoms: High oil consumption, 1 quart per 500-800 miles, Blue smoke on startup and acceleration, Fouled spark plugs on cylinders 2 and 3 primarily, Loss of power on highway grades

Fix: Worn piston rings and valve guides are typical on high-mileage Iron Dukes. Complete valve job with guide replacement plus ring job requires 14-18 hours. Many opt for used replacement engine instead due to labor costs versus engine value.

Estimated cost: $1,800-3,200

Typical onset: 70,000-110,000 mi

Symptoms: Coolant loss with no external leaks visible, Rough idle when engine is fully warmed, White residue on oil filler cap, Overheating in stop-and-go traffic

Fix: The composite intake gasket deteriorates and allows coolant into crankcase or creates vacuum leaks. Requires intake removal and thorough cleaning of mating surfaces. 4-6 hours labor. Often discover additional vacuum line and EGR system issues during repair.

Estimated cost: $450-750

Symptoms: Excessive engine movement visible when shifting into gear, Clunking from engine bay on acceleration or deceleration, Vibration through steering wheel at idle, Difficulty shifting into gear smoothly

Fix: Rubber mounts deteriorate from age regardless of mileage. Front and rear trans mounts fail together frequently. Both should be replaced as a set. 2-3 hours labor total. Often masked by bad transmission until mounts completely separate.

Estimated cost: $250-450

Symptoms: Transmission fluid dripping near radiator, Sudden loss of all transmission fluid, Transmission slipping after brief highway drive, Pink fluid visible under vehicle after parking

Fix: Steel cooler lines rust through at connection points and along frame rail mounts, especially in salt belt states. Line failure leads to rapid fluid loss and transmission damage if driven. 2-3 hours labor to replace both lines. Inspect closely on any used purchase.

Estimated cost: $300-500