Cavalier/Z24 L4-144 2.4L DOHC VIN T SFI (1996)
PROM - Programmable Read Only Memory: Customer Interest
Engine - Idle Fluctuationr, RPM Hunting During Decel
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 67-65-29
Date: August, 1996
Subject:
Idle Fluctuation in Gear or RPM Hunting during Deceleration and Unstable Idle (Flash Calibration)
Models:
1996 Chevrolet Cavalier
1996 Pontiac Sunfire with 2.4L Engine (VIN T - RPO LD9) and Automatic Transmission only
Condition
Some owners may experience an idle fluctuation in drive or RPM "hunting" during deceleration after reaching normal operating temperature.
Cause
The PCM controlled closed loop idle system may be interacting with the generator load, resulting in corrections that appear as idle speed fluctuations.
Correction
A new calibration has been developed to stabilize the idle speed. This calibration should only be installed if the owner has indicated a concern with the
vehicle idle stability or idle speeds.
Perform the PCM flash calibration procedure using the number 14 CD-ROM update or later version.
Correct calibration information is listed in the chart below.
Parts Information
Applications/
Broadcast
Part Number
Emissions
Code
and Scan ID
Federal
BZAZ
16249193
California
BZBA
16249203
Export
BZAY
16249183
Warranty Information
For vehicles repaired under warranty, use:
Labor
Labor
Procedure
Operation
Hours
PROM Reprogramming,
J6355
0.4 hr*
On Car
* Diagnosis time may be claimed for 0.0 to 0.7 hours depending on actual time performing diagnosis.