New 2008 Ford Expedition 5.4 liter engine - Purchased Thursday, 8/28/2008
Concern: After the auto has sit for a somewhat short period of time and/or overnight, I will hear a rather loud noise which sounds similar to a vacuum door slamming shut when accelerating somewhat aggressively. The sound will not be heard again, no matter how aggressive the acceleration, until the auto has sit idle once again for a short period of time and/or overnight.
Note: If the auto is driven cautiously (using the "light foot" method), the unusual sound is NEVER encountered. The sound seems to be coming from either just behind the driver's instrument cluster down near the floorboard OR just underneath and/or in front of the driver's feet on the outside of the car (possibly near the catalytic converter or brake booster pump reservoir). What can this be ............. the dealership doesn't seem to have a clue at this point in time AND I would rather they not simply start changing parts in an effort to resolve the issue.
Concern: After the auto has sit for a somewhat short period of time and/or overnight, I will hear a rather loud noise which sounds similar to a vacuum door slamming shut when accelerating somewhat aggressively. The sound will not be heard again, no matter how aggressive the acceleration, until the auto has sit idle once again for a short period of time and/or overnight.
Note: If the auto is driven cautiously (using the "light foot" method), the unusual sound is NEVER encountered. The sound seems to be coming from either just behind the driver's instrument cluster down near the floorboard OR just underneath and/or in front of the driver's feet on the outside of the car (possibly near the catalytic converter or brake booster pump reservoir). What can this be ............. the dealership doesn't seem to have a clue at this point in time AND I would rather they not simply start changing parts in an effort to resolve the issue.