QUICK SERV. INFO.- MISC ITEMS MULTIPLE SUBJECTS

THIS BULLETIN CONTAINS MULTIPLE SUBJECTS. PAGE THROUGH TO DESIRED SUBJECT

MISCELLANEOUS QSI (QUICK SERVICE INFORMATION) ITEMS

GR. 2 DIESEL INK STAMP ON 1981 C-CAR REAR BUMPER LICENSE OPENING FILLER SOME SOME 1981 DIESEL OR GASOLINE C-CARS MAY HAVE BEEN SHIPPED WITH THE WORD "DIESEL" STAMPED IN BLACK INK ON THE REAR BUMPER LICENSE OPENING FILLER PANEL. THE INK STAMPED "DIESEL" IS USED FOR IN-PLANT PARTS IDENTIFICATION AND SHOULD BE REMOVED BY WASHING WITH A MILD SOLVENT AND WATER IF ANY CARS REACH DEALERSHIPS WITH THIS INK STAMP STILL IN PLACE.

GR.3E TIRE VALVE CAPS COLORED FOR AUTOMATIC MATCH-MOUNTING ON 1982 CIMARRONS EARLY 1982 CIMARRONS MAY HAVE EITHER CLEAR, GREY, OR DARK COLORED TIRE INFLATION VALVE STEM CAPS WHICH MAY HAVE A VERY FAINT BLUISH TINT IN DIRECT SUNLIGHT. THESE CAPS HAVE BEEN MOLDED WITH A MATERIAL WHICH FLUORESCES (GLOWS) IN ULTRAVIOLET LIGHT. THIS PERMITS A NEW MACHINE IN THE ASSEMBLY PLANT TO "SEE" THE VALVE CAP SO THAT IT CAN AUTOMAT- ICALLY MATCH THE TIRE HIGH POINT MARK (ALSO FLUORESCENT) TO THE VALVE STEM, WHICH IS AT THE LOW POINT OF THE CIMARRON WHEEL. THIS MATCH-MOUNTING PROCESS IS DONE TO MINIMIZE TIRE AND WHEEL ROAD INPUT. IN THE UNLIKELY EVENT AN OWNER OBJECTS TO THE COLOR, THESE CAPS MAY BE REPLACED WITH STANDARD BLACK CAPS.

GR.6A ENGINE TIMING CHAIN DAMPENER - 1981 4.1 LITER ENGINE (V-6) THE STATIONARY TIMING CHAIN DAMPENER NORMALLY LOCATED TO THE LEFT OF THE TIMING CHAIN ON THE 4.1 LITER ENGINE WAS DISCONTINUED IN PRODUCTION WITH ENGINE BUILD CODE NO. 133. IT IS NOT NECESSARY TO INSTALL ONE FOR SERVICE. GR.6B COOLANT SENSOR CONNECTORS COOLANT SENSOR CONNECTORS ARE AVILABLE FROM GMWDD AND LISTED IN GROUP 2.530, P/N 12014843.

GR.6C CCC DIAGNOSIS - FUEL IN CRANKCASE IF ENGINE OIL IS CONTAMINATED WITH GASOLINE DUE TO FLOODING, YOU MAY GET ERRONEOUS DWELL READING BECAUSE OF FUEL VAPOR BEING DRAWN- IN THROUGH PCV SYSTEM.

GR.6C DIESEL FUEL RESERVE - 1981 ALL CARS THE 1981 MODEL DIESEL FUEL GAGES WERE REDESIGNED FOR MORE ACCURACY, DUE TO A CHANGE IN THE FUEL RESERVE. RESERVE CAPACITY HAS BEEN RE- DUCED TO APPROXIMATELY 1/2 TO 3 GALLONS, WHICH IS STATED IN THE 1981 OWNER'S MANUAL AS "LESS THAN FIVE GALLONS."

ALL 1981 MODEL DIESEL CARS HAVE A CHECK VALVE IN THE FUEL TANK FILTER WHICH WILL PERMIT FUEL TO PASS SHOULD THE TANK FILTER BECOME PLUGGED WITH PARAFFIN WAX DURING COLD WEATHER OPERATION. IF THIS HAPPENS THE LAST FOUR GALLONS OF FUEL WILL NOT BE REMOVED FROM THE TANK DUE TO THE LOCATION OF THE CHECK VALVE. CUSTOMERS SHOULD BE ADVISED TO KEEP THEIR TANKS ABOVE THE 1/4 MARK AT TEMPERATURES BELOW 20 DEGREES TO PREVENT RUNNING OUT OF FUEL.

GR.6D DETONATION V8-6-4 ENGINES TRACE DETONATION ON SOME V8-6-4 EQUIPPED VEHICLES SHOULD BE CONSIDERED NORMAL UNDER THE FOLLOWING CONDITIONS: A. HEAVY WIDE-OPEN THROTTLE ACCELERATIONS FROM A STOP. B. DURING CYLINDER MODE CHANGES (8-6, 804, ETC.) FACTORS THAT CAN AGGRAVATE DETONATION ARE AS FOLLOWS: A. BASIC ENGINE TIMING NOT PROPERLY SET. B. A RESTRICTED VACUUM SIGNAL TO THE EGR VALVE CAUSE BY PINCHED OR KINKED HOSES.

GR.7 VIBRATION - FRONT WHEEL DRIVE VEHICLES A VIBRATIOIN EXPERIENCED ON ACCELERATION IN SOME FRONT WHEEL DRIVE VEHICLES MIGHT BE CAUSED BY LOOSE FLEX PLATE TO TORQUE CONVERTER BOLTS. TORQUE TO SPEC. TO CORRECT.

GR. 8 COMPUTER COMMAND CONTROL CODE 23 ALL 1981 CARS ON ALL 1981 CARS WITH COMPUTER COMMAND CONTROL, CODE 23 CAN BE ENTERED INTO THE MEMORY BY DISCONNECTING THE M/C SOLENOID AND TURNING THE IGNITION SWITCH ON WITHOUT STARTING THE ENGINE. IT MAY BE POSSIBLE TO SET OTHER CODES WITHOUT STARTING THE ENGINE, PROVIDING A MALFUNC- TION EXISTS AT THE TIME AND THE CODE DOES NOT REQURIE A PREDETERMINED TIME BEFORE SHOWING ITSELF.

GR. 9 RADIO - WHISTLE IN ETR CASSETTE SOME 1981 ETR'S WITH AUTO REVERSE CASSETTE DECKS MAY HAVE A HIGH PITCHED WHISTLE THAT CAN BE HEARD IN SOME UNITS. THIS CONDITION CAN BE CORRECTED BY RADIO REPAIR CENTERS. REFER REPAIR CENTER TO THEIR DELCO ELECTRONICS TECHNICAL BULLETIN 81-T-1 (JANUARY 1981) WHICH COVERS THE REPAIR FOR THIS CONDITION.

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.