Alternator Type Whine Noise

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

If you should encounter an alternator type whine noise with a late model Buick equipped with a 3800 engine, and if you disconnect the alternator field wire and the noise is still there, the whine may be coming from the fuel pressure regulator. Disconnect the vacuum line that is attached to the fuel pressure regulator and plug it back in line. If the noise disappears, replace the fuel pressure regulator. This is Bill Metoyer, your Park Avenue and LeSabre Brand Quality Manager.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.