1991 PONTIAC GRAND AM

Typical onset: 80,000-140,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leak, Rapid overheating, Milky oil on dipstick, Loss of compression

Fix: The 2.3L Quad 4 is notorious for head gasket failure, often warping the aluminum head in the process. Repair requires head removal, machining, new gasket set, and typically timing chain components while apart. Expect 12-16 hours labor. Many owners find a used engine swap more economical than proper rebuild.

Estimated cost: $1,800-3,200

Typical onset: 100,000-150,000 mi

Symptoms: Heavy knocking from bottom end, Metal shavings in oil, Sudden loss of oil pressure, Engine seizure in extreme cases

Fix: The Quad 4's oil delivery system struggles at high mileage, starving rod bearings. Once knocking starts, it's short block replacement or full rebuild with crank polishing, new bearings, pistons inspection. 20-25 hours labor. Most techs recommend junkyard engine swap instead.

Estimated cost: $2,500-4,500

Typical onset: 90,000-130,000 mi

Symptoms: Slipping between gears, especially 2nd-3rd, Delayed engagement when shifting to Drive, Burnt transmission fluid smell, No reverse gear, Transmission overheating

Fix: The 3-speed automatic is undersized for the Quad 4's torque and suffers clutch pack failure and valve body wear. Rebuild requires 8-12 hours labor. Used transmissions are plentiful but often equally worn. Always replace cooler lines and external filter during service.

Estimated cost: $1,200-2,200

Typical onset: 60,000-100,000 mi

Symptoms: Transmission fluid puddles under engine bay, Pink fluid dripping near radiator, Low transmission fluid warnings, Transmission slipping after leaks develop

Fix: Steel cooler lines rust through where they run along subframe and connect to radiator. Replacement requires 2-3 hours labor and often means dropping subframe for access. Replace both lines and all rubber hoses as preventive measure. Leaking cooler lines starve the transmission and cause premature failure.

Estimated cost: $300-600

Symptoms: Window drops into door, Grinding noise when operating window, Window stuck in down position, Slow or jerky window movement

Fix: Plastic regulator gears strip or cables fray, dropping glass into door. Door panel removal and regulator replacement takes 2-3 hours per door. Driver's side fails most often. This was recall-worthy on some N-body platforms but parts availability is now limited.

Estimated cost: $250-450

Typical onset: 100,000-140,000 mi

Symptoms: No start condition with crank but no fire, Engine dying at operating temperature, Loss of power under acceleration, Whining noise from rear seat area

Fix: In-tank pump fails from wear and contamination. Requires fuel tank drop for access, 3-4 hours labor. Always replace fuel filter and strainer sock with pump. Running tank low repeatedly accelerates pump death.

Estimated cost: $400-700

Typical onset: 70,000-110,000 mi

Symptoms: Clunking over bumps, Steering wheel doesn't return to center, Popping noise when turning at low speeds, Uneven tire wear on inside edge

Fix: Upper strut mount bearings seize or disintegrate, affecting steering feel. Replace mounts as pairs with new struts if originals are tired. 3-4 hours labor for both sides with alignment. Ignore this and steering effort increases dramatically.

Estimated cost: $500-900