2011–2018 Lincoln MKX
By Tom Becker ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026
Save $335 by doing it yourself! Shop cost: $450
Quick answer: Spark Plug Replacement on a 2011–2018 Lincoln MKX is rated Advanced and takes about 2–3 hours. You'll need 6 tools for this job, and parts cost about $115. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Correct spark plug set for the gasoline/ICE engine in 2011-2018 Lincoln MKX; verify engine, heat range, gap, and VIN fitment | — | $115.00 | |
| Coil-boot seals or ignition coils only if inspection finds damage Optional | — | $35.00 | |
| New upper intake manifold gasket set | — | — |
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
Follow these steps carefully
2011–2015: 3.7L V6 (Ford Cyclone). 2016–2018: 3.7L V6 or 2.7L twin-turbo EcoBoost. Work cold; buy six plugs for your exact engine — the 3.7L and 2.7L take different types.
Remove the engine cover. The three front-bank coils sit in the open: unplug each connector, remove the bolt, and pull the coil straight up. Finish the front bank completely before touching the rear bank, so the two banks can't get mixed up.
On the 3.7L the intake manifold covers the rear bank — it must come off. Disconnect the throttle body, vacuum lines, and connectors, labeling everything. Unbolt the manifold and plug the open ports with rags. New gasket set required — old gaskets aren't reused.
On the 2.7L EcoBoost the rear bank hides behind the turbo plumbing — remove the air box and rear turbo inlet pipe to reach the rear coils. Label every clamp and hose so the boost plumbing seals airtight; a boost leak causes drivability complaints.
Remove the old plugs with a 5/8-inch socket. Gap per the manual — the EcoBoost runs much tighter than the 3.7L; adjust only the ground strap. Hand-thread each plug, then tighten to washer-seat plus a quarter to a half turn; aluminum strips if overtightened.
Seat each coil fully onto its plug, reinstall the coil bolts snugly, and click every connector home. On the 3.7L, fit the new intake manifold gaskets, lower the manifold into place, and tighten its bolts evenly in a crisscross pattern; reconnect the throttle body, vacuum lines, and sensors exactly as labeled. On the 2.7L, refit the turbo inlet pipe and air box, double-checking every clamp. Refit the engine cover and reconnect the battery.
Start up: smooth idle, no check-engine light. Hissing on the 3.7L means an intake gasket isn't sealing; whistling on the 2.7L means a loose boost clamp. Test-drive with some acceleration; a misfire code means rechecking the rear-bank coil connectors first. Note the mileage.
I've trained my ears for this one: That hissing-versus-whistling check is the fastest diagnostic on this job — hiss means the 3.7L intake gasket isn't sealing, whistle means a 2.7L boost clamp is loose. Listen before you touch anything else.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
2011–2018
2011–2015
2011–2015
2011–2015
2016–2018
2016–2018
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