1999 FORD F-350

7.3L V8 Power Stroke Diesel4WDAUTOMATICdieselturbo
5-Year Cost of Ownership
$42,462 maintenance + known platform issues
~$8,492/yr · 710¢/mile equivalent · $36,440 maintenance + $3,102 expected platform issues
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6.7L V8 Power Stroke Diesel
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7.3L V8 Godzilla
Common Problems & Known Issues

The 1999 F-350 with the 7.3L Power Stroke is a workhorse diesel that earns loyalty when maintained, but expect injector issues, transmission cooler failures, and eventual turbo/EBPV problems as miles pile on. The 7.3L is bulletproof compared to later models, but it's not maintenance-free.

Under-valve-cover injector harness failure (UVCH)

Common · high severity
Typical onset: 100,000-180,000 mi
Symptoms: Hard starting, especially cold, Rough idle, white smoke on startup, Oil contamination in electrical connectors under valve covers, Check engine light with injector circuit codes
Fix: Both valve covers come off to replace the injector harnesses and pigtails. Often done with valve cover gaskets at same time. 4-6 hours labor depending on rust and accessibility.
Estimated cost: $800-1,400

Transmission oil cooler line failure in radiator

Common · high severity
Typical onset: 120,000-200,000 mi
Symptoms: Transmission fluid in coolant (strawberry milkshake appearance), Coolant in transmission causing slipping and damage, Overheating or transmission failure if not caught early
Fix: Radiator replacement is mandatory—the cooler lines corrode internally and contaminate both systems. Transmission flush required, sometimes full rebuild if contamination went unnoticed. Radiator swap alone is 3-4 hours; add 15-25 hours if E4OD/4R100 needs rebuild.
Estimated cost: $600-1,000 radiator only, $2,500-4,500 with transmission rebuild

Exhaust back pressure valve (EBPV) and actuator failure

Common · medium severity
Typical onset: 80,000-150,000 mi
Symptoms: Loss of power, black smoke under load, Exhaust brake not functioning, Check engine light with EBPV circuit codes, Valve can stick closed causing severe restriction
Fix: Most techs delete the EBPV and install block-off plates rather than replace, as it provides minimal benefit and is a known failure point. Delete takes 1-2 hours and a simple kit.
Estimated cost: $150-350 for delete, $400-700 for OEM replacement

Turbocharger compressor wheel and pedestal leaks

Occasional · medium severity
Typical onset: 150,000-250,000 mi
Symptoms: Oil leaking from turbo pedestal onto exhaust manifold, Reduced boost pressure, sluggish acceleration, Blue smoke on acceleration, Whistling or grinding noise from turbo
Fix: Pedestal O-rings fail and leak oil; compressor wheel shaft play increases with age. Pedestal reseal is 3-4 hours, turbo replacement/rebuild adds 6-8 hours total with manifold work.
Estimated cost: $400-700 pedestal reseal, $1,200-2,200 turbo rebuild/replacement

Glow plug relay (GPR) clicking/failure

Common · medium severity
Symptoms: Constant clicking from relay under hood, Hard cold starts or no-start in freezing temps, Wait-to-start light stays on or flashes, Burned relay contacts visible on inspection
Fix: The GPR is a known weak point; aftermarket heavy-duty relays are better than Ford OEM. Replacement is 30 minutes, but often done with glow plug harness inspection.
Estimated cost: $150-300

CPS (Camshaft Position Sensor) failure causing no-start

Occasional · high severity
Typical onset: 60,000-140,000 mi
Symptoms: Sudden no-start with no warning, cranks but won't fire, Stalling while driving, then won't restart until cooled, No tachometer signal when cranking
Fix: Located behind the harmonic balancer on front cover; failure leaves you stranded instantly. Replacement requires removing balancer and is tight work. 2-3 hours labor. Smart owners carry a spare in the glovebox.
Estimated cost: $300-500

E4OD/4R100 transmission torque converter and overdrive issues

Occasional · high severity
Typical onset: 140,000-220,000 mi
Symptoms: Shudder or slipping in overdrive (4th gear), Delayed or harsh shifts, especially 2-3, No overdrive engagement on highway, Transmission overheating
Fix: The E4OD/4R100 is marginal for heavy towing; torque converter lockup and overdrive clutches wear. Often needs full rebuild with upgraded components. 15-20 hours labor for R&R and rebuild.
Estimated cost: $2,800-4,200
Owner tips
  • Change fuel filters religiously every 10-15k miles—the 7.3L's Achilles heel is dirty fuel damaging the HEUI injection system
  • Flush coolant every 2 years with proper diesel coolant additive to protect the oil cooler and head gaskets
  • Bypass or monitor the factory trans cooler-in-radiator setup before it grenades your transmission
  • Carry a spare CPS and glow plug relay—both are cheap insurance against being stranded
  • If towing heavy regularly, install an aftermarket transmission cooler and temp gauge
Absolutely buy one used if maintained—the 7.3L Power Stroke is the last truly mechanical diesel Ford made, but budget $2-3k for deferred maintenance catching up and expect transmission work if it's been towing hard.
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.
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