GM Service Manual Online
For 1990-2009 cars only

The air cleaner element, housing and ducts provide the engine with clean, filtered intake air for the combustion process. A flat air filter element provides maximum air filtration with minimum flow restriction. The air cleaner housing and ducts are designed to allow the maximum air flow possible with a minimum of noise produced and to reduce the potential for water ingestion into the engine.

Insure that the duct to the throttle body and air cleaner housing is properly seated and secured and that the air cleaner housing is latched together properly. An incorrectly assembled air cleaner system may cause excessive noise or may allow unfiltered air to enter the engine. Also, incorrectly installed air cleaner systems may cause fueling or driveability problems by affecting air-flow at the MAF sensor.