Neutral Engine Run-Up (NERU) Test

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

To carry out this test, proceed as follows:

Install a tachometer.
Increase the engine rpm up from an idle to approximately 4,000 rpm while in PARK on Front Wheel Drive (FWD) vehicles with automatic transmissions, or NEUTRAL for all other vehicles. Note the engine rpm and, if possible, determine the vibration frequency.
Attempt to identify what part of the vehicle the symptom is coming from.
Attempt to identify the source of the symptom.
If the source of the symptom has been identified as a result of this test, proceed to the appropriate article for further diagnosis and repair. If the source has not been identified, continue with the road test.