2008 Cadillac CTS Air Filter

First, you need to remove the air cleaner intake duct and open the throttle valve to inspect the Throttle Body bore and the throttle valve plate for any deposits. Then, please use a clean shop towel and Top Engine Cleaner GM P/N 1052626 or equivalent product to clean the throttle body bore and the throttle valve plate. Finally, you should install the air cleaner duct.

First, you need to remove the fuel injector sight shield and the air outlet duct, disconnect the brake booster vacuum hose, the purge solenoid valve electrical connector, and the purge line. Then, please remove the wiring harness retainer, disconnect the throttle body electrical connector, remove the upper Intake Manifold brace stud, bolt, and brace, disconnect the positive crankcase ventilation (PCV) hose, the barometric pressure sensor electrical connector, and the intake manifold runner control solenoid electrical connector. Finally, you should remove the injector harness bracket bolt, the left bank ignition coil wiring harness, the upper intake manifold bolts, and the upper intake manifold with the throttle body.

You need to turn off the ignition and remove the air cleaner duct.