2016 FORD E-350

Typical onset: 60,000-120,000 mi

Symptoms: Sudden misfire with loud popping sound, Loss of power under load, Check engine light with cylinder misfire codes, Hissing sound from engine bay

Fix: The 2-valve Triton V10 has inadequate thread engagement in the aluminum heads. Ejected plugs require HeliCoil or TimeSert thread repair (2-3 hours per cylinder if accessible). Severe cases damage the head requiring removal and machining (12-16 hours labor). Preventive installation of inserts on all cylinders runs 8-12 hours.

Estimated cost: $800-3,500

Typical onset: 80,000-140,000 mi

Symptoms: Transmission fluid leaking at radiator connection, Pink fluid puddles under vehicle, Transmission overheating warning, Milky transmission fluid (coolant contamination)

Fix: The steel cooler lines rust through at the radiator quick-connect fittings or along the frame rail. Simple line replacement is 2-3 hours. If coolant mixes with ATF before you catch it, the transmission is toast—full rebuild or replacement (14-20 hours). Flush the cooling system and trans simultaneously if caught early.

Estimated cost: $400-6,500

Typical onset: 90,000-150,000 mi

Symptoms: Ticking or tapping noise on cold start, Exhaust leak smell in cabin, Visible soot streaks on manifold, Loss of back pressure affects performance

Fix: Studs break off in the cylinder heads due to thermal cycling. Requires head removal to extract broken studs and retap threads (10-14 hours per side). Some techs attempt in-chassis extraction with mixed success (4-6 hours if lucky). Replace all studs with upgraded hardware during repair.

Estimated cost: $1,200-3,200

Typical onset: 120,000-180,000 mi

Symptoms: Harsh 1-2 or 2-3 upshifts when cold, Delayed engagement into reverse, Slipping under heavy throttle in 3rd or 4th, Burnt ATF smell

Fix: The 4R100 behind the V10 suffers from worn intermediate clutches and hardened seals with age. Band adjustments buy time (1 hour) but most need a full rebuild with upgraded clutches and shift kit (14-18 hours). Towing and high GVWR accelerates wear significantly.

Estimated cost: $2,800-4,800

Typical onset: 70,000-130,000 mi

Symptoms: No-start condition intermittently, Engine cranks but won't fire, Stalling at highway speed then restarts after cooling, No fuel pump prime sound on key-on

Fix: The FPDM mounted on the frame rail overheats and fails, cutting power to the fuel pump. Replacement is straightforward (1-1.5 hours) but diagnosis can be tricky if intermittent. Module is about $150-250. Some replace preemptively after 100k to avoid roadside breakdowns.

Estimated cost: $300-500

Symptoms: Clunking over bumps from rear suspension, Axle shifting side-to-side under load, Uneven tire wear on rear, Visible gap between spring pack and axle pad

Fix: U-bolts stretch and loosen over time, especially on vans that see loaded work or rough roads. Retorque to spec (30-45 minutes per side). If threads are damaged, replace U-bolts and check spring packs for separation (1.5-2 hours per side). Critical safety item that's often overlooked.

Estimated cost: $200-600

Symptoms: Trailer brakes activating without input, No trailer brake response when towing, Intermittent brake controller error messages, Brake controller display glitches

Fix: Ford issued recalls for faulty integrated trailer brake modules that fail internally. Covered under recall at dealer (2-3 hours labor, parts free). If you tow regularly and experience erratic trailer braking, check if your VIN is included and get it fixed immediately—major safety issue.

Estimated cost: $0 (recall)