The 2002 E-150 is a workhorse van with solid bones, but the 5.4L Triton is notorious for spark plug ejection and cam phaser failure, while both engines share Ford's problematic two-piece spark plug design that snaps during removal. Transmission cooler line corrosion is universal.
Spark Plug Ejection (5.4L V8 Triton)
Common · high severityTypical onset: 60,000-150,000 mi
Symptoms: Sudden misfire with loud popping or hissing sound from engine bay, Check engine light with cylinder-specific misfire codes, Loss of power and rough idle, Plug literally shoots out of cylinder head
Fix: Threads stripped in aluminum head require HeliCoil or TimeSert repair kit installation. If caught early, 2-3 hours labor for thread repair and new plug. If delay causes coil damage or head cracking, you're looking at 8-12 hours for head removal and machine work.
Estimated cost: $400-800 for thread repair, $2,500-4,000 if head needs removal or replacement
Two-Piece Spark Plug Breakage (Both Engines)
Common · medium severityTypical onset: 80,000-120,000 mi
Symptoms: Plug shell separates from electrode during removal attempt, Tip remains stuck in cylinder head, Typically discovered during routine tune-up
Fix: Ford's 2004-2008 plugs are carbon-welded nightmares on the 4.6L and 5.4L. Requires special extraction tools (Lisle 65600 kit). Budget 4-6 hours for full plug change if multiple break—every tech's least favorite job. Soak with penetrant overnight before attempting removal.
Estimated cost: $600-1,200 for tune-up with extractions
Cam Phaser Failure (5.4L V8 Triton)
Common · high severityTypical onset: 100,000-180,000 mi
Symptoms: Loud rattling or knocking on cold start for 5-30 seconds, Noise disappears once oil pressure builds, Check engine light with VCT codes (P0345, P0340), Progressively worsens over time
Fix: Both cam phasers typically fail. Requires timing chain replacement, phasers, tensioners, guides. 10-14 hours labor on book time, often runs longer due to seized bolts. Replace oil pump drive at same time or you'll be back in there within 20k miles.
Estimated cost: $2,800-4,500
Transmission Oil Cooler Line Corrosion
Common · high severityTypical onset: 90,000-140,000 mi
Symptoms: Transmission fluid leak at radiator connections, Fluid pooling under front of vehicle, Low transmission fluid level causing harsh shifts, Pink fluid mixed with coolant if internal cooler fails
Fix: Steel cooler lines rust through where they connect to radiator. Replace both lines as a set—don't patch. 2-3 hours labor includes dropping lines, flushing trans if contamination occurred. If radiator's internal trans cooler failed and mixed fluids, trans rebuild is 90% certain within 5,000 miles.
Estimated cost: $400-700 for lines only, $2,500-3,500 if transmission contaminated and needs rebuild
Intake Manifold Gasket Failure (Both Engines)
Occasional · medium severityTypical onset: 120,000-180,000 mi
Symptoms: Coolant leak at front or rear of intake manifold, Engine overheating or coolant loss with no visible external leak, Rough idle or misfire if coolant enters cylinders, White smoke from exhaust on startup
Fix: Plastic intake manifold bolts to aluminum heads—dissimilar metals and heat cycles kill the composite gaskets. 4-6 hours to remove intake, replace gaskets, thermostat housing (always leaking too), and coolant. Upgrade to Fel-Pro PermaDryPlus gaskets.
Estimated cost: $800-1,400
Rear Main Seal Leak
Occasional · low severityTypical onset: 130,000-200,000 mi
Symptoms: Oil dripping from bell housing area, Oil spots on driveway centered under transmission, Not severe but messy—no immediate danger
Fix: Requires transmission removal for access. 6-8 hours labor. Often combined with clutch/flywheel work if manual, or transmission service if automatic to justify the teardown cost. Seal itself is $30, labor is everything.
Estimated cost: $900-1,500
Cruise Control Deactivation Switch Failure
Occasional · low severitySymptoms: Cruise control will not disengage when brake pedal pressed, Brake lights may not illuminate, NHTSA recall-related issue—check if your VIN was covered
Fix: Brake pedal position switch fails. 0.5 hour job, switch clips into bracket above brake pedal. Check for recall coverage first—Ford extended warranty on many units. DIY-friendly repair.
Estimated cost: $80-150
Buy the 4.6L if you can find it—avoid the 5.4L unless cam phasers and plug threads have been addressed with receipts. Solid platform otherwise, but not for the faint of wallet past 120k miles.
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.