Engine Controls - Hesitation or Engine Stall
90cadillac03Bulletin No. T-90-5
File in Group 6E
Number 76
Corp. Ref. NO. 936001R
Date March, 1990
SUBJECT: TIP-IN HESITATION ON ACCELERATION, ENGINE STALL ON COLD START, OR ENGINE STALL ON DECELERATION
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 MEM-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~C (176~F) after six minutes, continue to run the engine until coolant temperature reaches 80~C (176~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.