1986 PONTIAC FIERO

Typical onset: 60,000-100,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Engine overheating especially in traffic, Rough idle and misfiring, Milky oil on dipstick

Fix: The 2.8L V6 in the cramped rear bay runs hot and blows head gaskets regularly. Requires engine pull or extremely difficult in-chassis work. Most shops pull the engine (8-12 hours labor), replace both gaskets, resurface heads, and address cooling system weaknesses. Add a mechanical fan conversion while you're in there.

Estimated cost: $2,500-4,000

Symptoms: Fuel smell in cabin, Oil drips on exhaust manifolds, Smoke from engine bay, Fuel odor after sitting, Visible fuel line deterioration

Fix: The notorious Fiero fire risk comes from deteriorated rubber fuel lines routed over hot engine components and oil leaks dripping onto exhaust. All rubber fuel lines should be replaced with proper fuel injection rated hose (2-3 hours). Address valve cover gaskets and oil pan leaks immediately. This is preventive work that saves cars.

Estimated cost: $400-800

Typical onset: 80,000-120,000 mi

Symptoms: Slipping between gears especially 2nd to 3rd, Delayed engagement when shifting to drive, Whining or grinding noises, No reverse or erratic reverse operation, Burnt transmission fluid smell

Fix: The Isuzu 3-speed automatic is inadequate for the V6 and fails regularly. Requires transmission drop and rebuild or replacement (6-8 hours in the Fiero due to rear mounting). Used units are cheap but equally worn. Rebuild with upgraded clutches runs $1,200-1,800 plus labor.

Estimated cost: $2,000-3,200

Symptoms: Sticky or hanging throttle, Cruise control not engaging or disengaging randomly, High idle after driving, Throttle not returning to closed position smoothly

Fix: The complex throttle cable routing in the mid-engine layout causes cables to bind, fray, or stick. Critical safety issue when throttle hangs open. Replace throttle cable assembly and cruise cable if equipped (2-3 hours). Proper routing and lubrication essential. Some techs eliminate cruise entirely.

Estimated cost: $250-450

Typical onset: 70,000-110,000 mi

Symptoms: Clunking over bumps, Wandering steering, Vehicle feels loose or vague, Tire wear on inside edges, Visible cracked rubber bushings at cradle mounts

Fix: The front and rear suspension cradles mount to the space frame via large rubber bushings that deteriorate with age. When they fail, handling goes from sports car to shopping cart. Requires supporting cradle, pressing out old bushings, pressing in new ones (4-6 hours per end). Many owners upgrade to polyurethane.

Estimated cost: $600-1,200

Typical onset: 60,000-90,000 mi

Symptoms: Overheating at idle or low speeds, No fan operation when engine hot, Fan runs constantly even when cold, Blown cooling fan fuse, Temperature gauge climbing in traffic

Fix: The electric cooling fan and its relay system fail regularly, and the cramped engine bay gives little natural airflow. Fan motor replacement requires rear deck removal and wrestling with limited access (2-3 hours). Test relay and coolant temp sensor first. Many add auxiliary fans or upgrade to dual-fan setups for reliability.

Estimated cost: $350-600

Symptoms: Intermittent gauge operation, Lights dimming or flickering, Starter clicking but not engaging, Random electrical accessories not working, Dashboard lights going out

Fix: GM's mid-80s electrical systems were marginal, and the Fiero's distributed grounds corrode over time. Common failure points: engine-to-chassis ground strap, headlight motor grounds, and instrument cluster grounds. Diagnosis takes patience (1-3 hours). Clean and upgrade all chassis grounds preventively.

Estimated cost: $150-400

Typical onset: 80,000-120,000 mi

Symptoms: Clutch pedal going to floor with no pressure, Difficulty shifting gears, Grinding when engaging gears, Fluid leak visible at bell housing, Spongy clutch pedal feel

Fix: The hydraulic clutch system uses a master and slave cylinder that fail with age. Slave cylinder is internal to the bellhousing, requiring transmission removal (5-7 hours labor). Replace both master and slave together, bleed system thoroughly. Some techs convert to external slave for future ease.

Estimated cost: $800-1,400