1980 OLDSMOBILE 88

Typical onset: 50,000-90,000 mi

Symptoms: White smoke from exhaust, Loss of coolant with no visible leaks, Hard starting when warm, Sudden overheating, Cracked cylinder heads

Fix: The 5.7L diesel (LF9) was based on a gasoline block with insufficient head bolt count and weak head gaskets. Head gasket failure allows coolant into cylinders. Repair requires head removal, resurfacing, ARP studs, and upgraded gaskets — 16-20 hours labor. Most owners eventually swap to a gas 350 or scrap the car.

Estimated cost: $2,200-3,800 for heads/gaskets; $3,500-6,000 for gas engine swap

Typical onset: 80,000-120,000 mi

Symptoms: Rattling noise on cold start for first 3-5 seconds, Loss of power and rough idle, Check engine light or timing-related codes, Metal shavings in oil, Engine won't start after sitting

Fix: GM used nylon-toothed cam gears that deteriorate and timing chains stretch. When the nylon teeth shed, timing jumps and valves can contact pistons. Requires front cover removal, new timing set with steel gear, and oil pan drop to clean debris — 6-8 hours labor. Critical preventive item.

Estimated cost: $650-1,100

Symptoms: Hesitation on acceleration, Black smoke and fuel smell, Flooding and hard starting, Erratic idle or stalling, Poor fuel economy (under 10 mpg)

Fix: The Rochester Quadrajet carbs are reliable when fresh but suffer from dried-out gaskets, leaking accelerator pump diaphragms, and clogged jets after sitting. Modern ethanol fuel accelerates degradation. Full rebuild kit with proper adjustment takes 3-4 hours; many shops prefer swapping to a rebuilt or converting to TBI.

Estimated cost: $350-600 rebuild; $800-1,400 for TBI conversion

Typical onset: 60,000-90,000 mi

Symptoms: Slipping in 2nd or 3rd gear under load, Delayed engagement into reverse, Whining noise in gear, Metal particles in pan, Sudden loss of all forward gears

Fix: The Turbo-Hydramatic 200 (metric) was a weak 3-speed used behind smaller engines. Thin clutch packs and inadequate cooling lead to early burnout. Rebuild requires 8-10 hours; many techs recommend upgrading to a TH350 or 200-4R with adapter if available. External cooler mandatory.

Estimated cost: $1,400-2,200 rebuild; $2,000-3,000 for TH350 swap

Symptoms: Check engine light stays on, Poor driveability and stalling, High idle or hunting idle, Failed emissions test, No power to carb solenoid or EGR

Fix: The 1980 model was early CCC (GM's first ECM system), using the fragile 1st-gen ECM and troublesome vacuum-switching components. Oxygen sensors fail, ECM capacitors leak, and vacuum hoses crack. Diagnosis requires proprietary scanner or jumper-wire flash codes. ECM replacement 1 hour; full system troubleshooting can run 3-6 hours.

Estimated cost: $200-450 for sensors/vacuum; $400-800 for ECM if available used

Symptoms: Rust bubbles in rear quarter panels behind wheels, Soft or perforated trunk floor, Frame rot near rear spring mounts, Rusted brake and fuel lines along frame rails

Fix: B-body frames rust in the rear section and rocker panels trap moisture. Brake line replacement is 4-6 hours; rear quarter patch panels 8-12 hours. Frame section replacement requires body-off work. Many cars look solid but have serious underbody issues.

Estimated cost: $600-1,200 for lines; $1,500-3,500 for panel/rocker work