Tip-In HESITIATION On Light Throttle Acceleration (67-65-30)

Publication date: 1996-09-01
Reference number: 67-65-30

TIP-IN HESITIATION ON LIGHT THROTTLE ACCELERATION

TECHNICAL SERVICE BULLETIN

Reference Number(s): 67-65-30

TIP-IN HESITATION ON LIGHT THROTTLE ACCELERATION (NEW FLASH PROM)

Model(s): 1994-95 Buick Skylark

1994-95 Chevrolet Beretta, Corsica

1994-95 Oldsmobile Achieva

1994-95 Pontiac Grand Am

all with 3100 V6 Engine (VIN M - RPO L82)

Section: 6E - Engine Fuel & Emission

Bulletin No.: 67-65-30

Date: September, 1996

CONDITION

Some owners may experience a slight tip-in hesitation on light throttle acceleration during the engine's warm up cycle.

CAUSE

Due to engine system variation, it is possible to shift the vehicle "rich" if the vehicle has been updated with a flash prom from service bulletin 57-65-24A . The flash proms in that bulletin were to address vehicles that were "lean" and causing stalls. It is possible to shift a vehicle "rich" with those calibrations and thus induce a rich hesitation. If that has occurred, new calibrations are available to "lean" the enrichment algorithm below coolant temperatures of 80°C (176°F).

CORRECTION

If service bulletin 57-65-24A has been performed and the vehicle exhibits a slight tip-in hesitation during warm up and normal diagnostics fail to show a cause, then install a new flash prom.

PARTS INFORMATION

The complete listing of new flash proms will be available for Techline Tools starting with CD #14 release from the GM Service Technology Group (STG).

NOTE: DO NOT attempt to order the flash proms from GMSPO. The flash proms are programmed into the vehicle's Powertrain Control Module (PCM) via a Techline Tool device.

FLASH PROMS INFORMATION

Model Year	Carline	Axle Ratio	Emission	Calibration Number
94	N	2.97	Nationwide	16247094
94	N	2.93	Nationwide	16247084
94	L	2.97	Nationwide	16247064
94	L	2.93	Nationwide	16247074
95	L	2.93	Nationwide	16247114
95	N	2.93	Nationwide	16247104
Requires Service Bulletin 47-71-31 (Replacement of Final Drive Assembly to have been performed). The standard axle ratio is a 2.97.

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

LABOR OPERATION NO.: J6355 - Prom Reprogramming, on car.

LABOR TIME: Use published labor operation time.

LABOR OPERATION NO.: J6352 - Prom Reprogramming, off car.

LABOR TIME: Use published labor operation time.