2010–2016 Buick LaCrosse
By Ray Delgado ✓ 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 2010–2016 Buick LaCrosse is rated Advanced and takes about 1-3 hours. You'll need 4 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 2010-2016 Buick LaCrosse; verify engine, heat range, gap, and VIN fitment | — | $115.00 | |
| Coil-boot seals or ignition coils only if inspection finds damage Optional | — | $35.00 |
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
Follow these steps carefully
Two 3.6L V6s: LLT (2010-2011) and LFX (2012+). Both take the ACDelco 41-109 iridium (GM 12622561), pre-gapped 0.043 in (1.1 mm). Buy six — 2.4L takes different plug. Scan for misfire codes (P0300-P0306) and check wells for oil or cracks.
Let the 3.6L cool — hot aluminum heads strip easily. Disconnect the negative battery cable, then pop off engine cover. Three coil packs per bank — rear bank sits against the firewall — plan extensions for the rear three now.
Front bank first. Squeeze each connector's locking tab and pull back — never yank the wiring. Unbolt and lift coils up. Blow dirt from the wells — grit scores the walls. A wobble extension and U-joint reach the rear-bank coils.
Fit a 5/8 in (16 mm) socket with rubber insert and turn counterclockwise. Thread plug in BY HAND to avoid cross-threading, then tighten to manual's spec. Never use an impact wrench. The NGK threads carry trivalent plating — no anti-seize.
Press coils onto their plugs, refit bolts, reconnect every connector. Reinstall cover and negative battery cable. Start it — smooth idle, no flashing check-engine light. Short drive, then rescan. A code means swapping that coil with a neighbor to check if it follows.
In my experience, Before you spend a dime on a new coil, do the swap test — move the suspect coil to another cylinder and see if the misfire code follows it. It's the fastest way to separate a bad coil from a bad plug.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
2010–2016
2010–2016
2010–2016
2010–2016
2010–2016
Acura CL · 2001–2003
Acura ILX · 2013–2022
Acura Integra · 2023–2026
Acura MDX · 2017–2021
Acura RDX · 2019–2024
Acura RL · 2005–2012
Acura TLX · 2015–2020
Acura TSX · 2004–2008
