How to Replace Spark Plugs 12-16 Cadillac SRX

Difficulty: Advanced · About 140 min · Cadillac Srx

Replace the spark plugs on a 2012–2016 Cadillac SRX after removing the intake plenum and renewing its gasket.

Steps

1. Disconnect power and remove the intake plenum

   Disconnect the negative battery cable, remove the engine cover and intake duct, then label and unplug sensors, vacuum hoses, and harness retainers. Remove the plenum fasteners and lift the plenum away; immediately cover the intake ports with clean lint-free material.

2. Remove the ignition coils and plugs

   Unplug each coil and remove its retaining bolt, then lift the coil from the plug well. Clear loose debris from each well without pushing it into the cylinder, and remove the plugs with a spark plug socket.

3. Install the new spark plugs

   Thread each replacement plug into the cylinder by hand to avoid cross-threading, then tighten to the engine specification. Apply dielectric grease sparingly to the coil boots, reinstall the coils and bolts, and reconnect their plugs.

4. Reinstall the intake plenum

   Remove the port covers and verify no debris entered the engine. Clean the mating surfaces, install a new plenum gasket, position the plenum, and tighten its fasteners in the specified sequence and to the vehicle specification.

5. Reconnect and check engine operation

   Reconnect every hose, sensor, wiring connector, and bracket, then reinstall the intake duct and engine cover. Reconnect the battery, start the engine, and check for vacuum leaks, misfires, and warning lights.

Check your vehicle’s repair manual for exact specifications and fit.