Engine - Rough Idle/Stall at High Altitudes
Article No.96-3-10
01/29/96
^ IDLE - ROUGH IDLE AND/OR STALL AND/OR DELAYED 1-2 SHIFT AT ALTITUDES ABOVE 1524 METERS (5000 FEET) - VEHICLES BUILT THROUGH 9/5/95
^ TRANSMISSION - 4R70W - DELAYED 1-2 SHIFT AND/OR ROUGH IDLE AND/OR STALL AT ALTITUDES ABOVE 1524 METERS (5000 FEET) - VEHICLES BUILT THROUGH 9/5/95
LINCOLN-MERCURY:
1996 TOWN CAR
This TSB article is being republished in its entirety to provide information on Powertrain Control Module (PCM) replacement for Service Bay Diagnostic System (SBDS) dealers.
CALIBRATION:
6-18E-R05, 6-18J-R05, 6-18Q-R05, 6-185-R05
WARNING:
THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE. PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.
ISSUE:
Some vehicles may have a stall and/or rough idle immediately after engine start-up at altitudes above 1524m (5000'). There may also be a delayed 1-2 upshift. This may be caused by the Powertrain Control Module (PCM) fuel calibration being set too lean for start-up conditions. The 1-2 shift speed calibrations may also be set too high.
ACTION:
Reprogram or replace the PCM. The new PCM will have a richer start-up and lowered 1-2 shift speeds. Dealers with SBDS are required to reprogram the PCM using the latest calibration update CD-ROM. Dealers without SBDS, refer to the Application Chart to determine the correct PCM.
NOTE:
DEALERS WITH SBDS ARE REQUIRED TO OBTAIN REGIONAL APPROVAL WHEN IT IS NECESSARY TO REPLACE THE PCM.
Obtain an Authorized Modifications Decal and list the date, dealer number, and summary of modifications performed. Select a prominent place adjacent to the Vehicle Emission Control Information Decal suitable for installing the Authorized Modifications Decal. Clean the area, install the decal, and cover it with a clear plastic decal shield.
PART NUMBER PART NAME
F6VZ-12A650-AC Powertrain Control Module (PCM)
F6VZ-12A650-BC Powertrain Control Module (PCM)
F6VZ-12A650-CC Powertrain Control Module (PCM)
F6VZ-12A650-DC Powertrain Control Module (PCM)
OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 96-1-4, 96-01-02
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME
960310A Reprogram Powertrain 0.2 Hr.
Control Module (PCM)
960310B Replace Powertrain Control 0.3 Hr.
Module (PCM)
DEALER CODING
CONDITION
BASIC PART NO. CODE
RECAL 08
OASIS CODES: 501000, 607000, 607400, 608000, 608400