The 1998 Expedition is a body-on-frame workhorse that can rack up miles, but the Triton V8s have a notorious spark plug issue and both engine options face intake manifold failures. The 4R70W transmission is generally solid but runs hot when towing, and the rear suspension sees frequent failures from the weight and use profile.
Spark Plug Ejection / Blown-Out Threads (4.6L and 5.4L)
Common · high severity
Typical onset: 60,000-150,000 mi
Symptoms: sudden loud popping or hissing noise from engine bay, immediate misfire and rough idle, CEL with misfire codes, loss of power
Fix: The two-piece spark plugs break on removal, and the aluminum heads strip threads. If caught early, HeliCoil inserts work (2-3 hours per hole). If a plug blows out while driving, you're looking at head removal and TimeSert inserts, or worst case, replacement heads. Budget 8-12 hours labor for a full head-off repair on one bank.
Estimated cost: $500-2,500
Intake Manifold Gasket Failure (4.6L and 5.4L)
Common · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: coolant loss with no visible external leaks, white smoke from exhaust on cold start, rough idle when warm, coolant in oil (milky dipstick) in severe cases
Fix: The plastic intake manifolds crack internally or the composite gaskets fail, allowing coolant into the intake runners or oil passages. Requires manifold removal and gasket replacement, often includes new thermostat housing while you're in there. 6-8 hours labor.
Estimated cost: $800-1,400
Transmission Cooler Line Failure at Radiator
Common · high severity
Symptoms: transmission fluid pooling under front of vehicle, pink fluid in coolant reservoir (transmission fluid mixing with coolant), transmission slipping or delayed engagement, rapid overheating of transmission
Fix: The factory quick-connect fittings at the radiator corrode and fail, or the internal transmission cooler ruptures, mixing ATF and coolant. If caught immediately, you replace lines and flush both systems (3-4 hours). If fluids mixed, the transmission is toast—needs full rebuild or replacement (12-16 hours labor for R&R plus rebuild).
Estimated cost: $300-4,500
Rear Axle Pinion Seal and Bearing Failure
Occasional · medium severity
Typical onset: 100,000-180,000 mi
Symptoms: gear oil leak at front of rear differential, whining or howling from rear end that changes with speed, clunking on acceleration, vibration at highway speeds
Fix: The pinion seal leaks first, then the bearing goes if you keep driving on it. Seal replacement alone is 2-3 hours, but if the bearing is shot, you need to set pinion depth and preload, which bumps it to 4-6 hours. Often find the ring and pinion need replacement too if run low on oil.
Estimated cost: $400-1,800
Upper and Lower Ball Joint Failure
Common · high severity
Typical onset: 80,000-140,000 mi
Symptoms: clunking over bumps from front end, wandering or loose steering, uneven tire wear on inside or outside edges, front end shimmy at highway speeds, visible play in wheel when jacked up
Fix: These trucks eat ball joints, especially uppers. The boots tear, dirt gets in, and they wear out fast. Uppers and lowers should be done together. The uppers require pressing out rivets or cutting them off, then bolting in new ones. Figure 4-6 hours for both sides, all four joints.
Estimated cost: $800-1,200
Fuel Pump Failure
Occasional · high severity
Typical onset: 120,000-180,000 mi
Symptoms: no-start with plenty of cranking, stalling at operating temperature, loss of power under load or at highway speeds, whining noise from rear of vehicle, long crank times before starting
Fix: The in-tank pump fails from age and heat cycling. Requires dropping the 30-gallon fuel tank (easier said than done when it's got 20 gallons in it). 3-4 hours labor. The sending unit often fails at the same time, so replace both if you're in there.
Estimated cost: $600-900
Rear Air Suspension Failure (if equipped)
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: rear end sagging, especially when loaded, compressor running constantly, suspension warning light, inability to level with load
Fix: The air springs crack and leak, and the compressor wears out from overwork. Most owners convert to conventional coil springs (2-3 hours). If you want to keep it stock, new air springs and compressor run 4-5 hours labor, but expect to do it again in another 60k.
Estimated cost: $400-1,500
Owner tips
Change spark plugs at 60,000 miles BEFORE they seize—use anti-seize and do it when the engine is warm but not hot
Install an auxiliary transmission cooler if you tow anything—the factory cooler is marginal at best
Inspect and replace transmission cooler lines preemptively at 100k miles—cheap insurance against a $3,500 rebuild
Flush coolant every 30,000 miles to prevent intake manifold gasket degradation
Grease the ball joints every oil change if they have fittings—most don't, so they're wear items
Buy one if it's been meticulously maintained with records showing spark plugs, trans cooler lines, and ball joints addressed—otherwise, budget $3,000-5,000 for catch-up repairs in the first year.
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.
Fitment notes: Standard top post configuration for 4.6L V8; battery located in engine compartment
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 1997-2002 Ford Expedition — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
📍 Below center console, between front seats on floor tunnel
🔧 Ford NGS / IDS with VCM
⚠️ Battery disconnect and 2-minute wait required before removal. Crash data must be cleared; module requires configuration for seat belt pretensioners and side airbags if equipped.
⚠️ PATS is PCM-integrated. Key programming requires scan tool access. Two programmed keys required to add additional keys via self-learn on 2000+.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
CERTAIN MAXZONE HEADLIGHT ASSEMBLIES, DEPO BRAND, P/NOS. 331-1129L-ASN AND 331-1129R-ASN, SOLD FOR USE AS AFTERMARKET EQUIPMENT FOR THE ABOVE LISTED PASSENGER VEHICLES. THESE HEADLAMPS FAIL TO CONFORM TO THE PHOTOMETRIC REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT.
Consequence: DECREASED LIGHTING VISIBILITY MAY RESULT IN A VEHICLE CRASH.
Remedy: MAXZONE WILL NOTIFY OWNERS AND OFFER REIMBURSEMENT FOR ANY NONCOMPLIANT HEADLIGHTS. THE RECALL BEGAN ON JULY 28, 2006. OWNERS MAY CONTACT MAXZONE AT 909-822-3288.
EXTERIOR LIGHTING · 06E060000
2006-06-29
CERTAIN AAI MOTORSPORTS COMBINATION LAMPS SOLD AS REPLACEMENT LAMPS FOR USE ON THE ABOVE LIST PASSENGER VEHICLES. COMBINATION LAMPS NOT EQUIPPED WITH AMBER SIDE REFLECTORS FAIL TO CONFORM WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT."
Consequence: LACK OF AMBER SIDE REFLECTORS IN THE LAMPS WILL DECREASE LIGHTING VISIBILITY TO OTHER DRIVERS AND MAY POSSIBLY RESULT IN A VEHICLE CRASH
Remedy: AAI MOTORSPORTS WILL NOTIFY OWNERS AND REPLACE THE LAMPS FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 1, 2006. OWNERS MAY CONTACT AAI MOTORSPORTS AT 909-923-9188.
VEHICLE SPEED CONTROL · 05V388000
2005-09-07 · EA05005
ON CERTAIN PICKUP TRUCKS AND SPORT UTILITY VEHICLES EQUIPPED WITH SPEED CONTROL, THE SPEED CONTROL DEACTIVATION SWITCH MAY OVERHEAT, SMOKE, OR BURN.
Consequence: A FIRE AT THE SWITCH COULD OCCUR.
Remedy: BY LETTER DATED SEPTEMBER 12, 2005, OWNERS WERE INSTRUCTED TO RETURN THEIR VEHICLES TO THEIR DEALERS TO HAVE THE SPEED CONTROL DEACTIVATION SWITCH DISCONNECTED. OWNERS WHO HAVE HAD THEIR SPEED CONTROL DEACTIVATED ARE BEING NOTIFIED THAT PARTS WILL BE AVAILABLE AND ADVISED TO MAKE AN APPOINTMENT TO RECONNECT THE SPEED CONTROL BEGINNING IN FEBRUARY 2006. OWNERS WHO DID NOT HAVE THEIR SPEED CONTROL DEACTIVATED ARE BEING NOTIFIED TO HAVE THEIR SYSTEM REMEDIED BEGINNING IN FEBRUARY 2006. OWNERS ARE URGED TO AVAIL THEMSELVES OF THE FREE DISCONNECT SERVICE AS SOON AS POSSIBLE BECAUSE OF THE SIGNIFICANT RISK OF FIRE. OWNERS MAY CONTACT FORD AT 1-800-392-3673. (NOTE: ALSO SEE RECALLS 05V017 AND 06V286)
EXTERIOR LIGHTING · 00V168000
2000-06-19
VEHICLE DESCRIPTION: MINI VANS, LIGHT PICKUP TRUCKS, AND SPORT UTILITY VEHICLES. OFF LEASE CANADIAN VEHICLES EQUIPPED WITH DAYTIME RUNNING LIGHTS WHICH MEET CANADIAN REQUIREMENTS AND NOT THE PHOTOMETRIC REQUIREMENTS OF FMVSS 108, "LAMPS, REFLECTIVE DEVICES, AND ASSOCIATED EQUIPMENT." ACCORDING TO FORD, THE VEHICLES WERE IMPORTED INTO THE U.S. ERRONEOUSLY.
Consequence: THE LIGHT GIVEN OFF FROM THE DAYTIME RUNNING LIGHTS IS BRIGHTER THAN ALLOWED BY U.S. STANDARDS.
Remedy: DEALERS WILL BE ADVISED TO DEACTIVATE THE RUNNING LIGHT FUNCTION AND TO COMPLETE ANY OUTSTANDING SAFETY RECALLS ON THESE VEHICLES.
TRAILER HITCHES · 00V073000
2000-03-07 · PE99060
VEHICLE DESCRIPTION: MULTI-PURPOSE VEHICLES. THE TRAILER HITCH ASSEMBLY TO THE FRAME ATTACHING BOLTS COULD LOSE THE CLAMP LOAD.
Consequence: THE TRAILER HITCH COULD THEN SEPARATE FROM THE VEHICLE.
Remedy: DEALERS WILL REPLACE THE TRAILER HITCH MOUNTING BOLTS AND NUT PLATES.
WHEELS:LUGS/NUTS/BOLTS/STUDS · 98V095000
1998-05-13 · EA97027
VEHICLE DESCRIPTION: MULTI-PURPOSE VEHICLES AND LIGHT DUTY PICKUP TRUCKS. THE LUG NUTS ON THESE VEHICLES MAY NOT CREATE SUFFICIENT CLAMP LOAD ALLOWING WHEEL MOVEMENT IN RELATION TO THE HUB/ROTOR MOUNTING SURFACE.
Consequence: THIS CAN RESULT IN THE LOOSENING OF LUG NUTS, STUD FATIGUE FAILURE, AND THE POTENTIAL FOR A WHEEL SEPARATION FROM THE VEHICLE, INCREASING THE RISK OF A VEHICLE CRASH.
Remedy: OWNERS OF THESE VEHICLES WILL BE RECEIVING TWO NOTIFICATIONS. THE FIRST NOTIFICATION, WHICH BEGAN IN MAY 1998, WILL PROVIDE AN INTERIM REPAIR PROCEDURE UNTIL PARTS BECOME AVAILABLE. THIS INTERIM PROCEDURE CAN BE COMPLETED BY OWNERS OR THEIR DEALERS. IT SPECIFIES THAT THE LUG NUT TORQUE MUST BE VERIFIED TO BE 100 LBS. THEN THE LUG NUTS NEED TO BE TIGHTENED AN ADDITIONAL 1/8 TO 1/4 TURN MORE. THERE WILL BE A SECOND OWNER NOTIFICATION, WHICH IS EXPECTED TO BEGIN JULY 20, 1998, UNDER WHICH DEALERS WILL INSPECT THE WHEEL STUDS AND REPLACE THE WHEEL LUG NUTS.
POWER TRAIN:AUTOMATIC TRANSMISSION:GEAR POSITION INDICATION (PRNDL) · 97V171000
1997-10-07 · PE97019
VEHICLE DESCRIPTION: LIGHT DUTY PICKUP TRUCKS AND MULTI-PURPOSE PASSENGER VEHICLES. IF THE AUTOMATIC TRANSMISSION SHIFT CABLE ASSEMBLY WAS NOT FULLY ATTACHED TO THE STEERING COLUMN BRACKET, THE SHIFT CABLE ASSEMBLY CAN COME OUT OF THE BRACKET. THE VEHICLE OPERATOR WOULD THEN NOT BE ABLE TO SHIFT THE TRANSMISSION FROM ONE OF THE DRIVE GEAR POSITIONS INTO THE PARK POSITION EVEN THOUGH THE GEAR SHIFT SELECTOR WOULD INDICATE "PARK."
Consequence: THE CONDITION WOULD NOT ALLOW A DISENGAGEMENT OF THE TRANSMISSION FROM THE PARK POSITION OR AFFECT PROPER NEUTRAL START SWITCH OPERATION. UNINTENDED VEHICLE MOVEMENT COULD OCCUR IF THE PARKING BRAKE WAS NOT SET.
Remedy: DEALERS WILL MAKE THE PROPER ATTACHMENT OF THE TRANSMISSION SHIFT CONTROL CABLE TO THE STEERING COLUMN BRACKET AND ADD A TIE STRAP TO THAT CONNECTION.
Performance
Horsepower
240hp
Torque
290lb-ft
0–60 mph
10.2sec
Quarter mile
17.8sec
Top speed
110mph
Fuel economy (EPA)
City
13mpg
Highway
18mpg
Combined
15mpg
Fuel
Regular Gasoline
Capability & size
Towing capacity
8,000lb
Payload
1,530lb
Curb weight
5,280lb
EPA class
Special Purpose Vehicle 2WD
Wiper blades
First generation (UN93). Both front wipers same length.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 1998 Ford Expedition 4.6L V8 Triton and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.