Engine Accessory Test

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. 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 all wheels, set the parking brake and firmly apply the service brake to reduce the risk of vehicle movement during this procedure. Failure to follow these instructions may result in serious personal injury.

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

NOTE: Use a frequency measurement tool to pinpoint accessory vibrations. A listening device, such as an EngineEAR, will also help to identify noises from specific accessories.

Remove the accessory drive belt(s).
Increase the engine RPM to where the symptom occurs.
If the noise/vibration is duplicated when carrying out this test, the belt(s) and accessories are not sources.
If the noise/vibration was not duplicated when carrying out this test, install the accessory belt(s), one at a time, to locate the source.
If the source of the symptom has been identified as a result of this test, proceed to the appropriate part for further diagnosis and repair. If the source has not been identified, continue with the road test.