Neutral Engine Run-Up (NERU) Test
WARNING: This page is about a different car, the 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The operation of the engine through the normal RPM range with the vehicle standing still and the transmission disengaged. This test is used to identify engine related vibrations.