Roadmaster Estate Wagon V8-350 5.7L VIN P SFI (1996)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
AIR Pump - Hesitation on Acceleration/DTC's Set
File In Section: 06 Engine/Propulsion System
Bulletin No.: 01-06-04-011
Date: March, 2001
TECHNICAL
Subject:
Water in AIR Pump and/or DTC P0410, P0412, P0415, P0416, P0100, P0101,
P0102 or DTC 48 (AIR System Disable Procedure)
Models:
1995-1996
Buick Roadmaster
1995-1996
Cadillac Fleetwood
1995-1996
Chevrolet Caprice, Impala SS
with 4.3L or 5.7L Engine (VINs W, P - RP0s L99, LT1)
Condition
^
Some customers may comment of a hesitation during heavy/full throttle acceleration.
^
A 1996 vehicle may also set any of the following DTCs:
-
P0410
-
P0412
-
P1415
-
P1416
-
P0100
-
P0101
-
P0102
^
A 1995 vehicle may set a DTC 48.
^
There will also be evidence of water in the AIR pump.
Cause
Under high engine speed and load conditions, hot exhaust gasses may leak past the air check valves. As the exhaust gasses in the air tube cool, water
vapors collect into the AIR pump. As the vehicle is driven, condensation from the AIR pump may come into contact with the Mass Airflow Sensor
through the AIR inlet hose. This condition may cause a hesitation on acceleration and may also set the DTCs.
Correction
To correct this condition, a Secondary AIR Injection Pump disable procedure has been developed. (It has been determined that the Secondary AIR
Injection system is not required to meet emission requirements for these vehicles only.)
