TIP-IN HES., ENGINE STALL ON COLD START ENG. STALL ON DECEL

MODELS AFFECTED: 1988 CIMARRONS

This bulletin is being revised due to changes in the MEM-CAL calibration and part numbers on both 5-speed applications. Please discard bulletin T-89-17A, Group 6E.

Some 1988 Cimarrons may experience any of the following conditions: tip-in hesitation on acceleration, engine stall on cold start, or engine stall on deceleration.

To repair this condition a service MEM-CAL has been developed and is available from GMSPO. Refer to the chart below for the correct MEM-CAL application:

Service Service Emission MEM-CAL MEM-CAL Broadcast System Trans Part Number I.D.* Code+ ------ ----- ------------ ----- ----- FED AUTO 16134468 4761 ARDC FED MAN 5-SPEED 16148227 8261 ATZA CAL AUTO 16134465 4741 ARDA CAL MAN 5-SPEED 16148228 8271 ATZB

NOTE: The following procedure must be followed when replacing the MEM-CAL to ensure a proper ECM idle learned value.

1. Disconnect the battery negative terminal.

2. Replace the NMM-CAL.

3. Restore the battery power and place the air conditioning controls in the off position.

4. Start the engine, apply brake, and shift the transmission to "drive" for automatics or "neutral" for manuals. Do not load the power steering system.

5. Allow the engine to run for six minutes. If coolant temperature does not reach 80 DEG C (176 DEG F) after six minutes, continue to run the engine until coolant temperature reaches 80 DEG C (176 DEG F).

This procedure will allow the ECM memory to be updated with the correct idle air control valve position. If the condition is still present after installing the MEM-CAL, refer to Section 6E3-B of the 1988 Service Information Manual.

*MEM-CAL I.D. can be read with a scan tool connected to the ALDL connector.

+ Broadcast Code can be seen through the access hole on the top side of the MEM-CAL. For warranty purposes use Labor Operation T0500 at .7 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.