1987 BUICK SKYHAWK

Typical onset: 80,000-140,000 mi

Symptoms: Heavy knocking or rattling from crankcase especially when cold, Sudden loss of oil pressure, Metallic debris in oil/filter, Engine seizure in worst cases

Fix: These engines eat main and rod bearings due to marginal oiling and thin bearing material. Requires complete bottom-end rebuild (crank grinding, new bearings, often pistons/rings while you're in there) or short/long block replacement. 16-22 labor hours for full rebuild in-chassis, add 4-6 hours for R&R if doing block swap.

Estimated cost: $2,200-4,500

Typical onset: 60,000-120,000 mi

Symptoms: ATF puddles under engine bay, Transmission slipping or no movement, Overheating transmission, Pink/milky ATF if cooler leaks into radiator

Fix: The steel cooler lines rust through where they connect to the radiator-mounted cooler, dumping all ATF in minutes. If coolant mixes with ATF via failed internal cooler, the transmission is typically destroyed. Replace lines and external cooler immediately when seepage starts. 2-3 hours labor for lines, but if trans is contaminated, you're looking at rebuild or replacement (8-12 hours).

Estimated cost: $180-350 (lines only), $1,200-2,200 (if transmission damaged)

Typical onset: 70,000-110,000 mi

Symptoms: Severe clunking when shifting from Park to Drive/Reverse, Excessive engine movement visible under hood, Vibration at idle, Difficulty shifting

Fix: The rubber transmission mount deteriorates badly, letting the powertrain rock excessively and stress shift linkage. Common on all J-bodies of this era. Replace mount and inspect adjacent engine mounts simultaneously. 1.5-2 hours labor.

Estimated cost: $150-280

Typical onset: 90,000+ mi

Symptoms: Hard starting, Stalling when hot, Loss of power under load, Rough idle and hesitation

Fix: Steel fuel tanks and lines rust internally, sending debris downstream. Inline fuel filter clogs rapidly if not changed every 15-20k miles. By this age, many need tank cleaning or replacement plus fuel pump screen service. Filter change is 0.5 hours, tank R&R adds 3-4 hours if needed.

Estimated cost: $45-120 (filter), $450-850 (tank replacement)

Typical onset: 100,000-150,000 mi

Symptoms: Blue smoke on startup and acceleration, Oil consumption 1 quart per 500-800 miles, Fouled spark plugs, Loss of compression

Fix: Ring lands crack or rings stick in grooves due to carbon buildup and metallurgy issues. Requires engine disassembly for piston/ring replacement. Often discovered during diagnosis of bearing noise. 14-18 hours if doing pistons only without full rebuild.

Estimated cost: $1,800-3,200

Symptoms: Rough cold starts, Stalling when coming to stops, Surging at steady throttle, Black smoke rich running

Fix: Early 1.8L engines used a Rochester 2-barrel carburetor that suffers from dried gaskets, stuck choke, and worn throttle shafts after sitting. Rebuild kits available but finding someone competent with carbs is harder than the work itself. 3-4 hours for proper rebuild and adjustment.

Estimated cost: $280-480