2005–2010 Pontiac G6
By Tom Becker ✓ Certified Mechanic · Published Sep 24, 2026 · Updated Oct 14, 2026
Save $297 by doing it yourself! Shop cost: $344
Quick answer: Spark Plug Replacement on a 2005–2010 Pontiac G6 is rated Moderate and takes about 45-90 minutes. You'll need 7 tools for this job, and parts cost about $47. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| 4x spark plugs (correct for 2.4L Ecotec; check owner's manual) | — | $37.00 | |
| Silicone paste for coil boots | — | $10.00 |
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
Let the engine cool completely, because hot aluminum threads are easy to damage. Open the hood and disconnect the negative battery cable with the 10mm socket. The ignition system is now safe to handle.
I let it cool completely — hot aluminum threads are easy to damage, and I've seen a plug take the threads out with it.
Video at 00:00
Lift the plastic engine cover off its mounting studs to reveal the coil packs on top of the 2.4L valve cover. Set the cover aside. All four coils are now exposed in a row.
Video at 01:30
Press the locking tab on each coil's electrical connector and unplug it, keeping track of each connector's cylinder. The video removes the coil bolts next with the 10mm socket. Labeling prevents any mix-up on reassembly.
I label each connector's cylinder as I go — I've mixed them up before, and the resulting misfire had me rechecking everything.
Video at 03:00
Remove the 10mm hold-down bolt from each coil and pull the coil straight up out of its well. If a boot sticks, twist gently instead of forcing it.
Video at 05:50
Blow any grit out of the wells with compressed air so nothing falls into the cylinders. Fit the 5/8-inch spark plug socket on an extension and unscrew each plug.
Video at 07:50
Check each new plug's gap with the gauge and set it to the specification on the plug box or in the owner's manual for the 2.4L engine. Screw the new spark plugs in.
Video at 08:55
Push each coil firmly down onto its plug until it seats, refit the 10mm hold-down bolts, and plug each connector back onto its original cylinder until it clicks.
Video at 12:25
Press the engine cover back onto its studs and reconnect the negative battery cable. Start the engine and check for a smooth idle and no check-engine light.
I listen for a smooth idle with no CEL — I've caught a missed coil connector this way before the car ever left the driveway.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
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