Neutral Engine Run-Up (NERU) Test

WARNING: This page is about a different car, the 2003 Mercury Sable and 2003 Ford Taurus. 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 4000 rpm while in PARK on front wheel drive 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 concern is coming from.
Attempt to identify the source of the concern.
Proceed as necessary.