Quick answer: Spark Plug Replacement on a 2024–2026 Ford Ranger is rated Moderate and takes about 45-90 minutes. You'll need 5 tools for this job, and parts cost about $41. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name |
Part Number |
Price |
Buy |
| Spark plugs (correct heat range) |
— |
$35.00 |
|
| Dielectric grease |
— |
$6.00 |
|
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Step-by-Step Instructions
Follow these steps carefully
1
Confirm engine and plug fitment
Confirm your 2024-2026 Ford Ranger's engine: the standard 2.3L EcoBoost four-cylinder takes four Motorcraft SP-578 iridium plugs, which arrive pre-gapped from the factory — verify the gap against your underhood emissions label rather than assuming a published figure. The Ranger Raptor's 3.0L EcoBoost V6 takes different plugs, so check the label under your hood if you are unsure. These are long-life iridium plugs on roughly a 100,000-mile interval. Scan for misfire codes (P0300-P0304) first; on the 2.3L EcoBoost a misfire under boost with a clean idle is the classic worn-plug symptom.
2
Cool and expose the plugs
Remove the plastic engine cover to expose the four coil-on-plug units in a row along the top of the valve cover, and unclip the air intake duct if it overhangs the coils. Disconnect the negative battery terminal.
3
Remove the ignition coils
Press the release tab on each coil connector and unplug it, remove the coil hold-down bolts, and pull each coil straight up with a gentle twist to break the boot seal. Keep the four coils in order on a clean rag.
4
Remove and install plugs
Loosen each old plug with a 5/8-inch (16mm) spark plug socket and a 6-inch extension, keeping the socket straight in the deep wells, and compare each new Motorcraft SP-578 to the old plug: identical thread, reach and heat range. The new plugs come pre-gapped — confirm the gap against your emissions label but never pry on the fine iridium tip. Thread each plug in by hand for several full turns until the gasket seats, then torque to 106 lb-in (12 Nm) — the Ford workshop-manual spec for the 2.3L EcoBoost's plugs — and confirm in your owner's manual. Install them dry: the coated threads need no anti-seize, which would corrupt the torque reading.
🔧 Mechanic's note — Ray Delgado
I learned this the hard way: The new plugs come pre-gapped — confirm the gap against your emissions label but never pry on the fine iridium tip.
5
Reconnect and verify
Smear a thin film of dielectric grease inside each coil boot only — rubber, never the plug — to seal out moisture and ease the next change. Push each coil firmly onto its plug, torque the hold-down bolts snug, and reconnect every locking-tab connector with a click. Refit the intake duct and engine cover, reconnect the negative battery terminal, and start the 2024-2026 Ford Ranger. Confirm a smooth idle with no check-engine light, road-test including boost, and rescan for codes; a misfire that returns on one cylinder points to that cylinder's coil pack.
🔧 Mechanic's note — Ray Delgado
I never skip this part: Smear a thin film of dielectric grease inside each coil boot only — rubber, never the plug — to seal out moisture and ease the next change.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Cross-threading the plug in the head
- • Skipping the torque wrench / overtightening
- • Wrong gap or heat range for the engine
- • Mixing up ignition coil connectors by cylinder
