Engine Accessory Test

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

To carry out this test, proceed as follows:

WARNING: Block the front and rear wheels, and apply the parking brake and the service brake, or injury to personnel can result.

CAUTION: Limit engine running time to one minute or less with belts removed or serious engine damage will result.

NOTE: A serpentine drive belt decreases the usefulness of this test. In these cases, use a vibration analyzer, such as the VA, to pinpoint accessory vibrations. An electronic listening device, such as an EngineEAR, will also help to identify noises from specific accessories. Remove the accessory drive belts.

Increase the engine rpm to where the concern occurs.
If the vibration or noise is duplicated when carrying out this test, the belts and accessories are not sources.
If the vibration or noise was not duplicated when carrying out this test, install each accessory belt, one at a time, to locate the source.