HESITATION ON ACCELERATION CHECK ECM PROM ID'S

MODELS AFFECTED: 1987 DE VILLE AND FLEETWOOD

Some 1987 De Villes and Fleetwoods built before VIN 264834 may experience a tip in hesitation condition during light acceleration from a stop in temperatures above 75 DEG F.

This condition may be caused by an ECM PROM with an I.D. of 272 (Federal) or 267 (California). The ECM PROM I.D. can be checked by entering diagnostics and selecting ECM parameter P.1.6 as described in Section 8D of the 1986 Final Edition De Ville/Fleetwood Service Information Manual.

To repair this condition, replace the ECM PROM with the appropriate part number listed below.

Emission Service Vehicle System Part Number PROM ID ------- --------- ----------- ------- De Ville/Fleetwood Federal 16075422 274 De Ville/Fleetwood California i6O75435 268

If replacing the ECM PROM does not repair this condition, proceed with hesitation diagnosis as described in Section 6E of the 1986 Final Edition De Ville/Fleetwood Service Information Manual.

For warranty purposes, use labor operation J6364 at .5 hour.

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.