NO/HARD START OR POOR DRIVEABILITY AT LOW AMBIENT. Geo Sprint 1993

REVISION: 12/08/94

THIS BULLETIN IS BEING REVISED TO CHANGE VIN INFORMATION AND "USAGE" STATEMENTS. (ARTWORK REMAINS THE SAME). ----------------------------------------------------------------------

SUBJECT: NO/HARD START OR POOR DRIVEABILITY AT LOW AMBIENT TEMPERATURE (REVISED ENGINE VACUUM HOSE ASSEMBLIES)

MODELS: 1993-94 GEO METRO 1994 PONTIAC FIREFLY

VINS AFFECTED:

1993 UNITS PRODUCED BEGINNING WITH: METRO XFI P6708773 (CAMI) METRO/METRO LSI P6724310 (CAMI); PK203427 (KOSAI)

1994 UNITS PRODUCED PRIOR TO: METRO XFI R6747870 METRO/METRO LSI AND FIREFLY R6747847 ----------------------------------------------------------------------

CONDITION:

SOME CUSTOMERS MAY COMMENT ON A "NO/HARD START" CONDITION OR EXPERIENCE "LOW POWER" AND "POOR DRIVEABILITY" DURING COLD WEATHER (LESS THAN 32 DEGREES F, 0 DEGREES C). IN ADDITION, DIAGNOSTIC TROUBLE CODES 31 OR 32 MAY BE SET.

CAUSE:

MOISTURE MAY BECOME TRAPPED IN THE ENGINE VACUUM LINE BETWEEN THE TBI UNIT AND THE MAP SENSOR AND FREEZE, RESULTING IN A LOSS OF SIGNAL FROM THE SENSOR. IF LEFT UNCORRECTED, MOISTURE MAY EVENTUALLY MIGRATE TO THE MAP SENSOR, RESULTING IN POSSIBLE SENSOR FAILURE.

CORRECTION:

REVISED ENGINE VACUUM HOSE ASSEMBLIES HAVE BEEN RELEASED WITH AN IMPROVED ROUTING DESIGNED TO ELIMINATE THE POSSIBILITY OF MOISTURE ACCUMULATION. HOSE ASSEMBLIES SHOULD BE INSTALLED PER THE INSTRUCTIONS SUPPLIED WITH EACH KIT. THESE PARTS SHOULD BE REPLACED IN ADDITION TO CHECKING FOR THE PRESENCE OF ANY ENGINE DIAGNOSTIC TROUBLE CODES AND TAKING THE APPROPRIATE CORRECTIVE ACTION. UPON COMPLETION, INSTALL THE NEW HOSE ROUTING OVERLAY SUPPLIED WITH EACH KIT.

P/N DESCRIPTION USAGE --- ----------- -----

91172055 HOSE KIT - ENGINE VACUUM 1994 ALL AND CALIFORNIA 1994 METRO/METRO LSI WITH M/T AND FED. - Z49

91172056 HOSE KIT - ENGINE VACUUM 1993 ALL 1994 METRO XFI AND FED. - Z49 1994 METRO/METRO LSI WITH A/T AND FED. - Z49 1994 ALL AND Z49

PART AVAILABILITY:

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE: LABOR OPERATION: J6980 LABOR TIME: 0.2 HR.

FIGURES: 1

Object Number: 82857 Size: FS

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.