How To Replace Ignition Coils 03-07 Cadillac CTS
Difficulty: Intermediate · About 35 min · Cadillac Cts
Replace the ignition coils, including loosening the intake manifold for access, on a 2003-2007 Cadillac CTS.
Tools you will need
- 13mm socket
- Flat blade screwdriver
- Torque wrench
- 18mm socket
- 10mm wrench
- 5/8 inch spark plug socket
- Ratchet
Parts and supplies
- Ignition coils
Steps
- Loosen the intake manifold
Remove the oil fill cap and engine cover, remove the intake manifold's top 13mm bolts, loosen the air intake hose clamp and pull the air box off, loosen the stud with a 10mm wrench, then loosen the 18mm bolt to pull the bracket back from the hose.
- Remove the old ignition coil
Loosen the coil's 10mm bolt, pry off its sensor harness, lift the intake manifold, then remove the coil.
- Install the new ignition coil
Insert it into place, connect the sensor harness, then tighten its 10mm bolt.
- Retighten the intake manifold
Preliminarily tighten the top 13mm bolts and then torque them to about 20 ft-lb, tighten the stud with the 10mm wrench and the 18mm bolt, press the air intake box onto the manifold and tighten its clamp, then refit the engine cover and oil cap.
Check your vehicle’s repair manual for exact specifications and fit.