Lumina V6-3100 3.1L VIN M SFI (1995)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine - Crank No Start/Rough Idle After Cold Soak
File In Section: 6E - Engine Fuel & Emission
Bulletin No.: 47-65-2O
Date: December, 1994
Subject:
Crank No Start/Runs Rough after Extreme Cold Weather Soak
(New Flash Calibration)
Models:
1994 Buick Regal, Skylark
1994 Chevrolet Beretta, Corsica
1995 Chevrolet Lumina, Monte Carlo
1993-94 Oldsmobile Cutlass Supreme
1994 Oldsmobile Achieva
1994 Pontiac Grand AM, Grand Prix
with 3100 Engine (VIN M - RPO L82)
Condition
During extremely cold weather (-10°F - 23°C and below), some vehicles may crank but not start or display a rough idle condition after an extended soak
period.
Cause
Extended high speed driving followed by long exposure to very cold ambient temperatures can result In ice formation over the tip of the fuel injector.
The ice is formed when moisture from the exhaust gas introduced by the EGR system during high speed driving condenses in the intake manifold and
freezes on the injector tip during an extended soak period in very cold ambient temperatures. This ice will restrict the fuel flow through the injector
causing rough idle and, in the worst case, a no start condition.
Correction
A new engine calibration has been released to address injector icing. The new calibration will disable EGR operation if coolant temperature is less than
or equal to 32°F (0°C) at start up. EGR will not be enabled until coolant temperature reaches 221°F (105°C).
Parts Information
All new calibration numbers will be available for Techline Tools starting with the November CD release from STG.
Important:
Do not attempt to order the calibration numbers from GMSPO. The calibrations are programmed into the vehicle's powertrain control module via a
Tech line Tool device.
Warranty Information
Labor Operation
Labor Time
T0500
0.3 hr
