Quick answer: Spark Plug Replacement on a 2017–2025 Chrysler Pacifica 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 2017-2025 Chrysler Pacifica; 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 plenum 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
Step-by-Step Instructions
Follow these steps carefully
1
Confirm engine and plug fitment
Confirm your Pacifica has the 3.6L Pentastar V6 — gas and hybrid Pacificas both use a 3.6L-based engine, so verify the exact plug on your underhood emissions label. The standard 3.6L takes six NGK Laser Iridium plugs (stock 7751, Mopar 68225755AA) gapped to 0.043 inches.
🔧 Mechanic's note — Tom Becker
I order the plenum gaskets with the plugs — same cart, same checkout — because the rear bank is unreachable without pulling the plenum, and I've learned reusing compressed gaskets is how you get a vacuum leak on top of new plugs.
2
Cool and expose the plugs
Let the engine cool completely — the Pentastar's aluminum heads must be cold before plug removal. Remove the engine cover, intake resonator and ducting, then disconnect the throttle body, its sensors and vacuum lines, and unbolt the upper plenum to expose the rear coils. Disconnect the negative battery terminal before unplugging coils.
3
Remove the coils
Press each coil connector's locking tab and unplug it, remove the 10mm coil hold-down bolts, and pull the six coil-on-plug units straight up, keeping them in order.
4
Remove and install plugs
Back each old plug out 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 to the new NGK Laser Iridium: same thread, reach and heat range. The new plugs arrive pre-gapped to 0.043 inches — check with a wire gauge but never lever against the fine iridium tip. Thread each plug in by hand for several full turns until it seats squarely; the rear-bank holes are hard to see, so feel the threads engage rather than forcing them. Torque to the FCA spec in your owner's manual and install them dry — NGK's coated threads need no anti-seize.
🔧 Mechanic's note — Ray Delgado
The rear-bank holes are blind, so I thread those plugs by feel for several full turns before the socket goes on. If the threads don't engage smoothly with fingertip pressure, it isn't seated — never force it.
5
Reconnect and verify
Coat the inside of each coil boot with dielectric grease — rubber only, never the plug — to seal out moisture. Reseat all six coils, torque the 10mm bolts snug, and reconnect every locking-tab connector with a click. Refit the upper intake plenum with the new gaskets, torquing its bolts in the factory crisscross sequence, then reconnect the throttle body, sensors, vacuum lines and intake ducting exactly as they were. Start the 2017-2025 Chrysler Pacifica and confirm a smooth idle with no check-engine light; road-test and rescan for misfire codes, since a stubborn single-cylinder miss now points to that cylinder's coil.
All Done!
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
- • Using the wrong plug or assuming a pre-gapped plug needs no verification
- • Blowing debris into an open cylinder or plug well
- • Cross-threading a plug or tightening it without a torque wrench
- • Overusing anti-seize or dielectric grease on the plug threads
- • Mixing coil connectors or ignoring a misfire after reassembly
