Engine Control - Idle Surge/Stall After A Cold Start
88chevy19Number:
REISSUE 88-324-6E
Section: 6E
Date: OCT., 1988
Subject: ENGINE STALL ONLY AFTER A COLD START OR IDLE SURGE
MAY SET CODE 35
Model and Year: 1988 CAVALIER WITH 2.8L (VIN CODE W) ENGINE
TO: ALL CHEVROLET DEALERS
Chevrolet Dealer Service Bulletin 88-324-6E, dated August, 1988, is being reissued to correct the engine application. The reissue also includes service procedures to ensure proper ECM idle learning. All copies of 88-324-6E dated August, 1988, should be discarded.
Some customers driving 1988 Cavaliers with a 2.8L MPFI engine (VIN Code W) may comment regarding an engine stall or idle surge, which may set code 35, after a cold start only.
If customer comments are received concerning these conditions and the vehicle does not have the new MEM-CAL listed below, a new service MEM-CAL should be installed in the electronic control module. The new MEM-CAL may be obtained from GMSPO by ordering the appropriate part number (reference the chart below):
NEW SERV
EMISSION OLD SERV TRANSAXLE MEM-CAL
SYSTEM PROM P/N TRANS RATIO MODEL P/N
CALIF. 16082348 3 SPD AUTO 3.18 1JF37/67 16128933
CALIF. 16080200 3 SPD AUTO 2.84 1JC35 16128933
FEDERAL 16082357 5 SPD MAN 3.61 1JA-ALL 16128934
FEDERAL 16082362 3 SPD AUTO 3.18 1JF37/67 16128936
FEDERAL 16075560 3 SPD AUTO 2.84 1JC35 16128936
CALIF. 16082366 5 SPD MAN 3.61 1JA-ALL 16128937
Parts are currently available from GMSPO.
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 degrees C (176 degrees F) after six minutes, continue to run the engine until coolant temperature reaches 80 degrees C (176 degrees F).
This procedure will allow the ECM memory to be updated with the correct idle air control valve position.
Use applicable Labor Time and Operation Code.