M/T - Engine Speed Flare During Gear Shifts

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 67-65-24A

Date: November, 1996

Subject:
Engine RPM Flare During Gear Shifts
(Repair Clutch Anticipate/Cruise Release Circuit and
New Flash Calibration)

Models:
1996 Chevrolet Camaro
1996 Pontiac Firebird
with 3800 Series II Engine (VIN K - RPO L36) and
Manual Transmission

This bulletin is being revised to remove a reference under cause. Please discard Corporate Bulletin Number 67-65-24 (Section 6E - Engine Fuel & Emission).

Condition

Some customers may comment about an engine speed flare, up to 500 rpm, during gear shifts. This condition is most prominent when shifting gears at engine speeds below 2500 rpm.

Cause

After checking for and repairing any Diagnostic Trouble Codes (DTC) that may be present, check the clutch anticipate/cruise release switch for proper operation. The clutch anticipate switch is normally closed when the clutch pedal is in the up position. The switch opens when the clutch pedal is depressed (down position). If the circuit is not operating correctly, the Powertrain Control Module (PCM) will not receive proper information during gear shifts that are made below 2500 rpm which could cause the flare condition.

Correction

1. Repair the clutch anticipate/cruise release circuit as required.

2. Flash PCM with new calibration. The new calibration is less sensitive to clutch anticipate switch information.

3. Test drive the vehicle after the above repairs to verify that the condition has been corrected.

Parts Information

The new flash calibration is available beginning with the April 4, 1996 CD number 7 from GM Service Technology Group. Do not attempt to order the calibrations from GMSPO. They are programmed into the vehicle's Powertrain Control Module (PCM) via a Techline Tool Device.

1996 Nationwide 16238374
Camaro/Firebird Emissions

1996
Camaro/Firebird Export Emissions 16238424

1996 Firebird Europe Export 16238364
Emissions

Warranty Information

For vehicle's repaired under warranty, use:

Labor
Operation Description Labor Time

R1245 Replace/Adjust Clutch Use Published
Anticipate/Cruise Labor Operation
Release Switch Time
Add Diagnose Clutch Use Published
Anticipate/Cruise Labor Operation
Release Circuit Time

J6355 Prom-Reprogramming Use Published
Flash E Prom Labor Operation
Time