AIR Pump - Water in System and/or DTC's Set.

File In Section: 6E - Engine Fuel & Emission

Bulletin No.: 77-65-13

Date: April, 1997

Subject:
Water in AIR Pump and/or DTC P0410, P0412, P1415, P1416, P0100, P0101, P0102 and DTC 48 (Install AIR Pump Service Kit)

Models:
1994-96 Buick Roadmaster
1994-96 Cadillac Fleetwood
1994-96 Chevrolet Caprice, Impala 55
with 4.3L and 5.7L Engines (VIN W, P - RPO L99, LT1)
and 4L60E Automatic Transmissions

Condition

Some vehicles may set any of DTC P0410, P0412, P1415, P1416, P0100, P0101, P0102, and DTC 48 (1994-1995). Also some police vehicles may exhibit a slight hesitation during wide open throttle acceleration. AIR Pump shows indication of water in it.


Cause


Under high engine speeds and loads hot exhaust gases may leak past the AIR check valves. As the exhaust gases in the AIR tube cool, water vapors condense and collect into the AIR pump. When the vehicle is driven, condensation from the AIR Pump may come in contact with the Mass Air Flow sensor and cause a slight hesitation during acceleration. This may also set Mass Air Sensor DTC's.


Correction

Verify AIR Pump operation using scan tool. Inspect AIR Pump for traces of water. If AIR Pump shows indication of water, install AIR Pump Service Kit. Inspect the AIR check valves by using a hand vacuum pump and applying 10 inches of mercury vacuum to the AIR hose side of the check valve. Vacuum should hold for at least 10 seconds. If not, replace the AIR check valves.

Parts Information

Description Part Number

AIR Pump 12554580
AIR Check Valves 22048212
AIR Pump Service Kit 12558522

Parts are currently available from GMSPO.





The AIR Pump Service kit Includes:

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation Description Labor Time

J6050 AIR Pump 0.3 hr
Add to J6050 AIR Service Kit 0.8 hr
J5068 AIR Check Valves 0.2 hr