2001 FORD E-350

Typical onset: 60,000-120,000 mi

Symptoms: Sudden loud pop or hissing sound from engine bay, Severe misfire, check engine light, loss of power, Visible damage to spark plug threads or plug blown completely out, Coolant or compression loss if severe

Fix: The 2-valve Triton head has inadequate thread engagement (4 threads vs. 8+ on most engines). Repair involves Time-Sert or Heli-Coil thread insert, 2-4 hours labor per cylinder if caught early. If multiple plugs eject or head damage occurs, expect cylinder head removal, resurfacing, and all new inserts installed preventively—12-16 hours labor. Some shops recommend preventive insert installation at 100k miles.

Estimated cost: $500-1,200 per cylinder for insert; $3,500-5,500 for head removal and all inserts

Typical onset: 80,000-140,000 mi

Symptoms: Transmission fluid in coolant reservoir (strawberry milkshake appearance), Engine coolant in transmission (harsh shifting, slipping, failure), Transmission overheating, burnt fluid smell, Sudden transmission failure after cooler breach

Fix: The factory cooler inside the radiator fails internally, allowing cross-contamination. Once mixed, the transmission is often toast—requires transmission rebuild or replacement, radiator replacement, all cooler lines flushed, 16-24 hours labor. Preventive fix: install external auxiliary cooler and bypass or replace radiator at 100k, 3-4 hours labor.

Estimated cost: $3,500-6,500 for full transmission/radiator replacement after failure; $600-1,200 preventive external cooler install

Typical onset: 90,000-150,000 mi

Symptoms: Coolant seepage around intake manifold base, Rough idle, vacuum leak codes, Slow coolant loss without external puddles, White smoke briefly at startup if coolant enters cylinders

Fix: The plastic intake crossover tubes crack and the composite gaskets deteriorate. Requires intake manifold removal, all gaskets, crossover tubes, and often coolant flush, 6-8 hours labor. Not as catastrophic as spark plug ejection but can cause overheating if ignored.

Estimated cost: $1,200-1,800

Typical onset: 100,000-180,000 mi

Symptoms: Intermittent no-start or stalling, especially when hot, Fuel pump runs continuously or not at all, Dies while driving, restarts after cooling, No fuel pressure at rail

Fix: The fuel pump driver module (mounted to the frame rail near the fuel tank) fails due to heat and corrosion. Replacement is straightforward—disconnect battery, unbolt module, swap, 1-1.5 hours labor. OEM Ford part recommended as aftermarket often fails quickly.

Estimated cost: $300-550

Typical onset: 80,000-140,000 mi

Symptoms: Ticking or tapping noise from engine, worse when cold, Exhaust leak smell in cabin, Visible gap or soot at manifold-to-head joint, Check engine light (O2 sensor codes from leak)

Fix: Exhaust manifold studs snap due to thermal cycling. Requires manifold removal, drilling out broken studs, retapping or installing Time-Serts, new manifold gaskets, 4-6 hours labor per side. V10 layout makes access moderately difficult.

Estimated cost: $800-1,400 per side

Symptoms: Cruise control inoperative or disengages randomly, Brake pedal feels spongy or has excessive travel, Hissing sound from brake pedal area, Check engine light with lean codes (vacuum leak)

Fix: The cruise deactivator switch at the brake pedal and vacuum hoses deteriorate (subject to recall 04V-053). Switch replacement is 0.5-1 hour, vacuum line repair/replacement adds 1-2 hours depending on routing. Not dangerous but annoying and can affect idle quality.

Estimated cost: $150-400

Typical onset: 70,000-120,000 mi

Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at highway speeds (58-65 mph common), Excessive driveline movement visible under load, Transmission sag or misalignment

Fix: Rubber transmission mount collapses, allowing excessive movement and driveline angle changes. Replacement requires supporting transmission, unbolt old mount, install new, realign if necessary, 1.5-2.5 hours labor. Often done with engine mounts as preventive maintenance.

Estimated cost: $250-500