Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2004 Saturn ion cold start engine knock › 2004 Saturn ion cold start engine knock April 28, 2012 at 11:00 am #439242 college manModerator I did not realize it was a cartridge filter. my suggestion still stands on trying another cartridge filter. Has this start up noise always been there or is this new?C8-) what weight and viscosity are you using?