2006 Cadillac CTS Changing spark plugs

Tiny
FSCHREIER
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  • 2006 CADILLAC CTS
Engine Mechanical problem
2006 Cadillac CTS 6 cyl Two Wheel Drive Automatic

How hard is it to change the spark plugs? I see that I will have to remove the intake. Any surprises that I should be aware of or watch for?
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Friday, March 19th, 2010 AT 6:38 PM

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Tiny
FACTORYJACK
  • EXPERT
You might have some intake fastener access conflicts in the rear where it goes under the cowl. The spark plug torque is only shown to be 15 ft lbs, and the upper intake torque is 17 ft lbs. For the sake of reference, I included the text portion of the procedure for the upper intake R&R. Let me know if you need an illustration, and I will try my best.
Upper Intake Manifold Replacement
Removal Procedure
Turn the ignition OFF.
Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.

Remove the air inlet duct. Refer to Air Cleaner Inlet Duct Replacement.
Disconnect the brake booster vacuum hose from the intake manifold.

Disconnect the purge solenoid valve electrical connector.

Disconnect the purge line (3) from the purge solenoid valve.

Remove the wiring harness retainer.

Disconnect the throttle body electrical connector.

Remove the upper intake manifold brace stud (1), bolt (2) and brace.
Disconnect the positive crankcase ventilation (PCV) hose from the right bank camshaft cover.

Disconnect the barometric pressure sensor electrical connector.

Disconnect the intake manifold runner control solenoid electrical connector.

Remove the injector harness bracket bolt.
Remove the left bank ignition coil wiring harness from the bracket.
Remove the upper intake manifold bolts. Some deflection of the cowl panel may be necessary to extract the right rear bolt.
Remove the upper intake manifold with the throttle body.
If the upper intake manifold is being replaced, disassemble the intake manifold. Refer to Intake Manifold Disassemble.
Clean and inspect the intake manifold. Refer to Intake Manifold Cleaning and Inspection.
Installation Procedure
If the upper intake manifold is being replaced, assemble the intake manifold. Refer to Intake Manifold Assemble.

Install a NEW upper intake manifold gasket.
Install the upper intake manifold.
Notice: Refer to Fastener Notice in the Preface section.

Important: Tighten the intake manifold bolts in an X pattern starting with the inside bolts and moving outward.

Install the upper intake manifold bolts.
Tighten
Tighten the upper intake manifold bolts to 23 N m (17 lb ft).

Connect the barometric pressure sensor electrical connector.

Connect the intake manifold runner control solenoid electrical connector.
Connect the PCV hose to the right bank camshaft cover.

Install the upper intake manifold brace, stud (1), and bolt (2).
Tighten
Tighten the intake manifold brace bolt/stud.

8.1. Tighten the intake manifold brace bolt (2) to 65 N m (48 lb ft).

8.2. Tighten the intake manifold brace stud (1) to 10 N m (89 lb in).

Notice: Ensure proper engagement of the wiring harness connector. The wiring harness connector must be installed straight onto the component connector and firmly seated. Visually inspect the connector to ensure that the connector latches are engaged and locked. Any damage to the connector or wiring must be repaired. Failure to follow this procedure can lead to an intermittent electrical connection, driveability concerns, and/or wiring harness or wiring harness connector damage or failure.

Connect the electrical connector to the throttle body.

Install the wiring harness retainer.

Connect the purge line (3) to the purge solenoid valve.

Connect the purge solenoid valve electrical connector.
Connect the brake booster vacuum hose to the intake manifold.

Install the air inlet duct. Refer to Air Cleaner Inlet Duct Replacement.
Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement.
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Friday, March 19th, 2010 AT 11:17 PM

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