1984 BUICK SKYHAWK

Typical onset: 80,000-140,000 mi

Symptoms: Blue smoke on startup and acceleration, Rapid oil consumption (quart per 500-800 miles), Loss of compression, Knocking or slapping noises from crankcase, Eventually seizes or throws a rod

Fix: The 1.8L Brazilian engine had chronic piston ring sealing problems and wore cylinder bores rapidly. Once oil consumption starts, it snowballs fast. Typical fix is complete engine rebuild (12-16 hours labor) with bore honing, new pistons, rings, bearings, and gaskets. Many shops won't rebuild these—they swap in junkyard motors instead (8-10 hours). Short block replacement runs 10-14 hours.

Estimated cost: $2,800-5,500

Typical onset: 60,000-100,000 mi

Symptoms: Severe clunking when shifting from park to drive, Excessive engine movement visible from outside, Vibration at idle, Shifter feels loose or sloppy

Fix: The rubber transmission mount deteriorates and tears, letting the powertrain sag and bang around. Common on all J-bodies from this era. Replacement is straightforward—support engine, unbolt old mount, install new (1.5-2 hours labor). Often done with motor mounts at same time.

Estimated cost: $180-320

Typical onset: 90,000-150,000 mi

Symptoms: Manual: grinding into second or third gear, won't engage smoothly, Auto: slipping between gears, delayed engagement, won't hold gear under load, Burnt transmission fluid smell

Fix: The Isuzu-based manual transmission (if equipped) had weak synchros that wore prematurely. Full synchro replacement requires trans removal and teardown (8-12 hours). The THM-125 automatic slips clutches and needs rebuild or replacement (10-14 hours for rebuild). Many techs just swap transmissions from salvage.

Estimated cost: $1,200-2,800

Typical onset: 70,000-120,000 mi

Symptoms: Transmission fluid puddles under car, Fluid on radiator or cooler lines, Low transmission fluid level, Slipping or harsh shifts from fluid starvation

Fix: Steel cooler lines rust through where they route along subframe, especially in salt states. Lines can also crack at fittings. Replacement involves dropping lines, fabricating or installing aftermarket replacements, refilling and checking for leaks (2-3 hours). Some techs use braided flex lines as upgrade.

Estimated cost: $220-450

Symptoms: Hard starting when engine is hot, Stalling in traffic or after shutting off hot, Rough idle and stumbling, Won't restart until engine cools 20-30 minutes

Fix: Carbureted 1.8L models suffer from fuel line routing that causes vapor lock in hot weather. Fuel filters also clog from tank sediment in aging cars. Filter change is simple (0.5 hours), but vapor lock may require rerouting fuel lines away from exhaust or adding heat shield (2-3 hours custom work).

Estimated cost: $85-400

Typical onset: 100,000-160,000 mi

Symptoms: Deep knocking noise from bottom of engine, worse under load, Low oil pressure at idle, Metallic debris in oil, Noise disappears momentarily when spark plug wire pulled on affected cylinder

Fix: Related to the oil consumption problem—worn rings let combustion pressure into the crankcase, accelerating bearing wear. Requires engine removal, full teardown, crank inspection/polishing, new main and rod bearings, plus usually new oil pump (14-18 hours labor). If crank is scored beyond spec, it's a short block replacement.

Estimated cost: $3,200-6,000