For 1990-2009 cars

# VIBRATION DIAGNOSIS-REED TACH AND ROTATION ORDER CHARTS

#### VEHICLES AFFECTED: 1986-1987 DE VILLE, FLEETWOOD, FLEETWOOD BROUGHAM, CIMARRON, AND 1987 ALLANTE

To aid in diagnosis of vibrations, Cadillac has developed rotational order charts. These charts combined with resonant reed tachometer provide a systematic method for diagnosing vibration conditions. This bulletin includes rotational order charts for the following vehicles:

1986 Cimarron with 2.OL Engine and Automatic Transaxle 1986 Cimarron with 2.OL Engine and Manual Transaxle 1986 Cimarron with 2.8L Engine and Automatic Transaxle 1986 Cimarron with 2.8L Engine and Manual Transaxle 1986 and 1987 De Ville and Fleetwood with Base Suspension 1986 and 1987 De Ville and Fleetwood with Touring Suspension 1986 and 1987 Eldorado and Seville 1986 and 1987 Fleetwood Brougham 1987 Fleetwood Brougham with Trailer Towing Package 1987 Allante 1987 Cimarron with Automatic Transaxle 1987 Cimarron with Manual Transaxle

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.