Neutral Engine Run-Up (NERU) Test

WARNING: This page is about a different car, the 2004 Mazda Tribute, 2003 Mazda Tribute, and 2002 Mazda Tribute. 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 3500 RPM while in PARK on front wheel drive vehicles with automatic transaxles, 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.