The 2002 F-250 Super Duty is a split personality truck: the 7.3L Power Stroke is a legendary diesel workhorse, while the 6.8L V10 Triton earned a notorious reputation for spark plug and engine failure issues that can lead to catastrophic damage.
V10 Triton Spark Plug Ejection and Thread Failure
Common · high severityTypical onset: 60,000-150,000 mi
Symptoms: Sudden misfire with loud pop or hiss from engine bay, Check engine light with cylinder misfire codes, Loss of power under load, Coolant or compression loss if severe
Fix: The two-piece spark plug design and inadequate thread engagement causes plugs to blow out or break off during removal. Prevention requires HeliCoil inserts at each change (2-3 hours). Full thread repair after ejection runs 4-6 hours per hole. If multiple cylinders need work or heads are damaged, you're looking at head removal and machine work.
Estimated cost: $800-1,500 preventive per head, $2,000-4,000+ after ejection
V10 Triton Piston and Ring Failure
Occasional · high severityTypical onset: 100,000-200,000 mi
Symptoms: Excessive oil consumption (quart per 500-1000 miles), Blue smoke on startup or acceleration, Rough idle with compression loss, Metal shavings in oil, Catastrophic knock if piston skirt cracks
Fix: Early 2V Triton V10s suffer from weak piston skirts and ring land failures, especially in trucks used for towing. Once oil consumption starts, it accelerates. Repair requires full engine rebuild or replacement. Used engines run 8,000-12,000 miles average. Complete rebuild is 20-30 hours labor plus machine work.
Estimated cost: $4,500-8,000 rebuild, $3,500-6,000 used engine swap
7.3L Power Stroke Injector O-Ring Leaks
Common · medium severityTypical onset: 150,000-250,000 mi
Symptoms: Hard starting when engine is hot, Rough idle with white smoke, Fuel smell in oil (check dipstick), External fuel weeping around injectors, Loss of power under load
Fix: The injector sleeve O-rings harden and fail, allowing fuel into the crankcase or external leaks. Requires removing valve covers, injectors, and updating to newer-style sleeves with thicker O-rings. Budget 8-10 hours labor for all eight injectors. This is preventive maintenance on high-mileage 7.3s.
Estimated cost: $1,200-2,000 for all eight injectors
7.3L Power Stroke Fuel Bowl Heater and Filter Housing Leaks
Common · low severitySymptoms: Fuel puddle under front of engine, driver side, Fuel smell when parked, Hard starting in cold weather if heater fails
Fix: The fuel filter housing and integrated fuel heater develops leaks from failed O-rings or cracked housings. The fuel bowl heater can also short and drain batteries. Simple fix is aftermarket billet aluminum housing with new seals (2 hours), delete the heater entirely (common modification). Original Ford plastic housings will leak again.
Estimated cost: $300-600
Transmission Torque Converter Shudder and Oil Cooler Failure (4R100)
Common · medium severityTypical onset: 100,000-180,000 mi
Symptoms: Shudder during light acceleration 40-50 mph, Delayed engagement when cold, Transmission overheating, Metal shavings in pan, Coolant in transmission fluid (pink milkshake in radiator)
Fix: The 4R100 transmission behind both engines suffers torque converter lockup issues and the factory in-radiator oil cooler fails internally, mixing coolant and ATF. Once contaminated, the entire transmission needs rebuild or replacement (12-16 hours). Always install external auxiliary cooler and bypass factory cooler as preventive measure (3-4 hours).
Estimated cost: $2,500-4,500 rebuild, $400-800 preventive cooler upgrade
Front Axle Vacuum Hub Failure (4WD)
Occasional · medium severityTypical onset: 80,000-150,000 mi
Symptoms: 4WD won't engage, Grinding noise from front hubs when engaging 4WD, 4WD engages one side only, Hissing from front axle
Fix: The vacuum-actuated front hub locks fail from torn diaphragms or check valve leaks. The entire vacuum system (lines, solenoid, hubs) gets brittle with age. Diagnosis takes 1-2 hours tracing vacuum leaks. Most shops recommend converting to manual locking hubs (2-3 hours) which eliminates the problem permanently.
Estimated cost: $400-800 OEM repair, $300-500 manual hub conversion
Ball Joint Failure
Common · high severityTypical onset: 80,000-120,000 mi
Symptoms: Clunking over bumps, Wandering steering, Uneven tire wear, Visible play when prying on tire, Catastrophic failure causes wheel to separate
Fix: These trucks eat ball joints, especially upper joints on the Dana 50/60 front ends under heavy loads. Ford had several recalls for ball joint failures causing wheel separation. Inspect every oil change after 60k. Replacement requires press work — most shops do both uppers and lowers preventively. Budget 4-6 hours for both sides.
Estimated cost: $800-1,400 both sides
Buy the 7.3L diesel without hesitation if maintained — avoid the V10 unless it's already had preventive spark plug work and shows no oil consumption; budget $3-5k reserve for either engine's eventual needs.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.