Engine Controls - Chuggle Between 28-37 MPH

90pontiac25
Bulletin Number: 90-6-48
Reference Number: 076503
Publish Date: 12/90
Subject: CHUGGLE AT LOW SPEED (28-37 MPH), NEW MEM-CAL

Models

Affected: 1989-90 GRAND AM MODELS W/2.3L (VIN D) AND 3T40
If concerns about chuggle between speeds of 28 - 37 mph are received and thorough diagnosis of the engine control system does not resolve the concern, you may need to install a revised Mem-Cal.



PARTS INFORMATION:
These Mem-Cals raise the TCC engagement speed to 37 mph and reduces the throttle position, crowd release of TCC. However, vehicle fuel economy may be affected. Be sure to advise the owner of this.

NOTICE: This Mem-Cal is intended to be used on an as needed basis. The part number will be in GMSPO but as a field fix only. This will not be published in the GMSPO catalog.

Parts are currently available from GMSPO.

WARRANTY INFORMATION

Labor Operation Number : T0500
Labor Time : 0.4 hour
Trouble Code : 92