Firebird V6-191 3.1L (1990)
Ignition Control Module: Customer Interest
PROM - Cold Start Stall/Hesitation Upshift Sag
Bulletin Number:
92-6-44
Reference Number:
136505R
Publish Date:
4/92
Subject:
COLD START STALL/HESITATION IDLE ROLL
AND UPSHIFT SAG (DIAGNOSTICS, NEW
HEI MODULE AND MEMCAL)
Models Affected:
1990-92 FIREBIRD MODELS WITH 3.1
THIS BULLETIN HAS BEEN REVISED TO ADD THE 1992 MODEL YEAR, THE ADDITION OF TWO "IMPORTANT" STATEMENTS, TO
ELIMINATE THE VIN BREAKPOINTS AND TO CHANGE THE MEMCAL INFORMATION WITH THE ADDITION OF THE M/T. THIS
BULLETIN CANCELS AND REPLACES BULLETIN 91-6-32 ISSUED 3/91. PLEASE DISCARD BULLETIN 91-6-32.
Condition:
Some customers may experience Cold Start Stall and/or Hesitation, Idle Roll and/or 1-2 Upshift Sag with their 1990-92 Firebird models.
Cause:
System and component variability and electromagnetic interference.
Correction:
If any of the subject conditions are found, complete the following procedure:
1.
Perform diagnostics, per Section 6E of the Service Manual. Make any adjustments as required, or replace any defective parts associated with the
above conditions.
Important:
The customer should avoid the use of high octane fuels as they do not increase performance.
2.
Replace the High Energy Ignition (HEI) module with a new P/N 16140039, and install a new Mem-Cal from the table, using the Service Manual
and attached procedure.
Important:
The appropriate model year cartridge must be used to check new MEMCALS.
Broadcast
Scanner
Part
Code
I.D.
Number
Description
AZTY
1331
16171406
MEMCAL (FED-AUTO)
AZTX
1321
16171410
MEMCAL (CALIF-AUTO)
BAWX
6651
16176864
MEMCAL (NATIONWIDE-
MANUAL)
A.
Pull the underhood Electronic Control Module (ECM) continuous power fuse or disconnect the battery and leave it disconnected for at least 1
minute.
B.
Remove existing Mem-Cal and install a new service Mem-Cal per the latest service procedure.
C.
Restore the battery power and place air conditioning controls (if equipped) in the "Off" position.
D.
Firmly apply the parking brake and block the drive wheels. Start the engine, and shift the transmission to "Drive".
E.
Allow the engine to run until the engine cooling fan has cycled once, or a maximum of 10 minutes.
F.
Turn the ignition key to the "Off" position for at least 5 seconds.
