LOW SPEED DRIVEABILITY CODE 22 - REPLACE TPS

SUBJECT: CODE 22 - IDLE SURGE, LOW SPEED HESITATION, OR ROUGH IDLE

MODELS AFFECTED: 1991 BROUGHAMS

Some 1991 Broughams with the 5.0L (VIN E) or 5.7L (VIN 7) engines may experience a "Service Engine Soon" light or low speed driveability conditions. This may include a stored code 22 (Throttle Position Sensory, idle surge, low speed hesitation, or rough idle.

This condition may be caused by plastic mold flash on the internal contact pads causing incorrect TPS output.

Follow the normal diagnostics found in Sections 6E2-A, 6E2-B, and 6E2-C2 of the Service Information Manual. If replacement of the TPS is necessary, use kit P/N 17112404. Do not use any TPS that is Julian Date coded prior to C1350. The Julian Date of 135 represents May 15 (135th day of the year), and 0 represents the year 1990 (9 = 1989). The Julian date is located on the TPS face just below the production part number. It can be identified without removing the TPS from the throttle body.

Parts are currently available from GMSPO.

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.