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1999 FORD EXPLORER

5.0L V8•AWD•AUTOMATIC•gas
5-Year Cost of Ownership
$11,883 maintenance + known platform issues
~$2,377/yr · 200¢/mile equivalent · $5,470 maintenance + $5,713 expected platform issues
Compare this engine
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2.3L I4 EcoBoost
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3.0L V6 EcoBoost
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3.0L V6 EcoBoost
Common Problems & Known Issues

The 1999 Explorer is notorious for catastrophic timing chain failures on SOHC engines and transmission self-destruction, making it one of Ford's riskier mid-size SUVs from this era. The 4.0L OHV is more durable but underpowered; the 5.0L V8 is rare but generally solid.

4.0L SOHC Timing Chain Cassette Failure

Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Rattling noise on cold start that quiets after warmup, Check engine light with cam/crank correlation codes, Sudden catastrophic engine failure with metal shavings in oil, Loss of power and rough running
Fix: SOHC engines use plastic-backed timing chain cassettes that disintegrate. Plastic shards circulate through the engine, often destroying bearings and requiring full rebuild or replacement. Preventive cassette replacement is 12-15 hours labor; post-failure rebuild is 25-35 hours. Many shops won't touch the preventive job due to liability.
Estimated cost: $2,500-4,000 preventive; $4,500-7,500 engine rebuild/replacement

5R55E Transmission Failure

Common · high severity
Typical onset: 90,000-140,000 mi
Symptoms: Harsh 2-3 or 3-4 shifts, Slipping between gears under load, No reverse or delayed engagement, Burnt transmission fluid smell, Metal shavings in pan during service
Fix: The 5R55E is fundamentally weak, with coast clutch and overdrive servo failures being epidemic. Band adjustments and fluid changes rarely save it once symptoms appear. Expect rebuild (18-22 hours) or replacement. Cooler line corrosion (per recalls) accelerates failure.
Estimated cost: $2,200-3,800

Front Ball Joint Separation

Common · high severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunking over bumps, Wandering steering, Uneven tire wear on inside edges, Visible grease boot tears, In catastrophic cases: sudden loss of steering control
Fix: Lower ball joints wear and can separate from the knuckle without warning—this was a major safety issue across early 2000s Explorers. Both sides should be done simultaneously (4-6 hours). Some techs replace entire control arms for liability reasons, adding cost.
Estimated cost: $600-1,200

Rear Axle Bearing and Seal Leaks

Common · medium severity
Typical onset: 80,000-130,000 mi
Symptoms: Gear oil dripping inside rear brake drums, Rear brake contamination and reduced stopping, Howling noise from rear that changes with speed, Visible oil on inside of wheel
Fix: Axle seals fail and allow gear oil to contaminate rear drum brakes. Requires axle removal, seal replacement, and brake overhaul on affected side (3-4 hours per side). If bearing is damaged, add bearing replacement time.
Estimated cost: $400-800 per side

Intake Manifold Gasket Coolant Leaks (SOHC)

Occasional · medium severity
Typical onset: 100,000-160,000 mi
Symptoms: Coolant smell from engine bay, Slow coolant loss without visible external leaks, White smoke on cold start, Rough idle when engine is cold
Fix: The plastic intake manifold warps and gaskets fail, allowing coolant into cylinders or external leaks. Replacement requires removing upper plenum and runners (6-8 hours). Use OEM gaskets—aftermarket versions often fail quickly.
Estimated cost: $800-1,400

Cruise Control Deactivation Switch Fire Risk

Occasional · high severity
Symptoms: Burning smell from under hood near brake master cylinder, Smoke from engine bay, Cruise control stops working, Melted wiring near brake pedal assembly
Fix: Speed control deactivator switch can short and cause under-hood fires even with ignition off (multiple recalls). Check if recalls 00S05, 04E024, or 06S05 were completed. Replacement is 1-2 hours if not recalled.
Estimated cost: $150-300 if not covered by recall

EVAP Purge Valve and Vacuum Leak Issues

Common · low severity
Typical onset: 60,000-110,000 mi
Symptoms: Check engine light with P0442, P0443, P0455 codes, Rough idle, Fuel smell, Failed emissions testing
Fix: Vacuum lines become brittle, and the EVAP canister purge valve sticks. Diagnosis involves smoke testing (1 hour), then replacing valve and damaged vacuum lines (1-2 hours total).
Estimated cost: $200-450
Owner tips
  • If buying a SOHC 4.0L, verify timing cassettes were replaced or budget for immediate replacement—this is non-negotiable.
  • Change transmission fluid every 30k miles with Mercon V only; most weren't maintained and are living on borrowed time.
  • Inspect ball joints every oil change after 60k miles—rent a pickle fork and check for play yourself if the shop won't.
  • Verify all cruise control recalls were completed; check firewall and wiring for previous fire damage.
  • The OHV 4.0L (flex-fuel with pushrods) is dramatically more reliable than the SOHC—seek these out if possible.
Hard pass unless it's an OHV 4.0L with verified maintenance records and under $3,000—the SOHC engine and 5R55E transmission are ticking time bombs that often cost more to fix than the vehicle is worth.
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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