INFO - TWO TYPES OF LD9 ENGINES ( W/ AND W/O EGR). Pontiac Grand Am 1999

SUBJECT: INFORMATION - TWO TYPES OF LD9 ENGINES (WITH AND WITHOUT EGR)

MODELS: 1999 PONTIAC GRAND AM WITH 2.4L ENGINE (VIN T - RPO LD9)

THE FOLLOWING INFORMATION IS BEING DISTRIBUTED AS AN AID TO THE SERVICE MANUAL, LISTING THE DIFFERENCES BETWEEN THE TWO TYPES OF LD9 ENGINES.

THE 1999 GRAND AM USES TWO VERSIONS OF THE 2.4L, LD9 L4 ENGINE. BOTH TYPES ARE COVERED IN THE SERVICE MANUAL.

THE FIRST TYPE WAS USED EARLY IN PRODUCTION AND IS EASILY IDENTIFIED BY THE EGR VALVE.

- HAS AN EGR VALVE

- USES MULTEC INJECTORS WITH 2 OHM RESISTANCE PER INJECTOR

- HAS A SINGLE WIRE KNOCK SENSOR

- FUEL PRESSURE IS 284-325 KPA (41-47 PSI)

- DTC'S WITH EGR ARE:

DTC P0106 DTC P0121 DTC P0401 DTC P0404 DTC P0405 DTC P0460 DTC P1404

THE SECOND TYPE ENGINE WAS USED IN PRODUCTION ON VEHICLES BUILT AFTER 7/20/98 AND IS IDENTIFIED BY AN ADDED RPO CODE OF RC9. THE ENGINE RPO CODE IS STILL LD9.

- NO EGR VALVE

- USES MULTEC 2 INJECTORS WITH 12 OHM RESISTANCE PER INJECTOR

- HAS A TWO WIRE KNOCK SENSOR

- FUEL PRESSURE IS 358-405 KPA (52-59 PSI). THIS MAY BE REVISED DURING THE YEAR.

- DTC'S WITHOUT EGR ARE:

DTC P0105 DTC P0461

- DTC'S DELETED WITHOUT EGR ARE:

DTC P0106 DTC P0121 DTC P0401 DTC P0404 DTC P0405 DTC P0460 DTC P1404

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GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.