LIGHT THROTTLE SURGE NEW PROM INFORMATION

CONDITION A SURGING CONDITION MAY OCCUR ON SOME 1982 TORONADOS EQUIPPED WITH A 5.0L V-8 ENGINE. AS THE ENGINE TEMPERATURE GAGE REACHES APPROXIMATELY 220F, AND THE CAR IS DRIVEN AT LOW TO MODERATE SPEEDS, THE AIR/FUEL MIXTURE MAY BECOME LEAN ENOUGH TO CAUSE THE VEHICLE TO SURGE. CORRECTION INSTALL A NEW PROM, PART NUMBER 1226377, USING THE FOLLOWING PROCEDURES: E.C.M. REMOVAL PROCEDURES 1.REMOVE FASTENER ATTACHING ECM HOUSING TO KICK PAD. 2.REMOVE HOUSING AND E.C.M. TOGETHER FROM KICK PAD BY PULLING OUT LOWER EDGE OF HOUSING AND SLIDING DOWNWARD. 3.REMOVE E.C.M. FROM HOUSING AND DISCONNECT WIRING. PROM REPLACEMENT PROCEDURES 1.REMOVE PROM ACCESS COVER. 2.REMOVE PROM AND CARRIER ASSEMBLY FROM E.C.M. BY PULLING UPWARD. 3.LAY THE NEW PROM AND CARRIER ON A FLAT SURFACE SO THAT THE PINS ARE POINTING UPWARD. 4.USING A NARROW, BLUNT, NON-METALLIC TOOL, PRESS DOWN ON THE BODY OF THE PROM, ON BOTH SIDES OF THE RETAINER BAR UNTIL THE ENDS OF THE PINS ARE JUST BELOW THE OFFSET IN THE CARRIER (SEE FIG. 1). 5.POSITION THE PROM CARRIER INTO THE E.C.M. MAKING SURE THE CARRIER NOTCHES ARE ALIGNED WITH THE E.C.M. CUTOUTS. 6.WHILE FIRMLY HOLDING THE CARRIER DOWN, PRESS DOWN FIRMLY ON THE BODY OF THE PROM USING A NARROW, BLUNT, NON-METALLIC TOOL (SEE FIG. 2). THIS WILL SEAT THE PROM INTO THE E.C.M. TAKE CARE TO INSURE THAT THE PINS DO NOT BEND DURING INSTALLATION. 7.REINSTALL THE PROM ACCESS COVER. E.C.M. INSTALLATION PROCEDURES 1.REVERSE THE PROCEDURES UNDER THE PREVIOUS HEADING - "E.C.M. REMOVAL PROCEDURES." A SYSTEM PERFORMANCE CHECK IS NOT NECESSARY FOR THIS REPAIR. SHOULD A SURGE CONDITION STILL EXIST AFTER PROM REPLACEMENT, THE FOLLOWING CARBURETOR ADJUSTMENT WILL BE NECESSARY. NEW CARBURETOR ADJUSTMENT PROCEDURES THE NEW TOOLS NEEDED TO PERFORM THESE NEW CARBURETOR ADJUSTMENTS (SEE ILLUSTRATION ON FINAL PAGE) ARE INCLUDED IN THE 1983 ESSENTIAL TOOL PACKAGE. DEALERS SHOULD BEGIN RECEIVING THESE TOOLS IN SEPTEMBER. M/C SOLENOID 1.REMOVE AIR HORN, MIXTURE CONTROL SOLENOID PLUNGER, AIR HORN GASKET AND PLASTIC FILLER BLOCK, USING NORMAL SERVICE PROCEDURES. 2.REMOVE THROTTLE LEVER SIDE METERING ROD. INSTALL MIXTURE CONTROL SOLENOID GAGING TOOL J-33815-1, BT-8253-A, OR EQUIVALENT, OVER THE THROTTLE LEVER SIDE METERING JET ROD GUIDE, AND TEMPORARILY REINSTALL THE SOLENOID PLUNGER INTO THE SOLENOID BODY (SEE FIG. 3). 3.HOLDING THE SOLENOID PLUNGER IN THE DOWN POSITION, USE TOOL J-28696-10, BT-7928, OR EQUIVALENT, TO TURN LEAN MIXTURE (SOLENOID) SCREW COUNTERCLOCKWISE UNTIL THE PLUNGER BREAKS CONTACT WITH THE GAGING TOOL. THE ADJUSTMENT IS CORRECT WHEN THE SOLENOID PLUNGER IS CONTACTING BOTH THE SOLENOID STOP AND THE GAGING TOOL (SEE FIG. 3). 4.REMOVE SOLENOID PLUNGER AND GAGING TOOL, AND REINSTALL METERING ROD AND PLASTIC FILLER BLOCK. INVERT AIR HORN, AND REMOVE RICH MIXTURE STOP SCREW FROM BOTTOM SIDE OF AIR HORN, USING TOOL J-28696-4, BT-7967A OR EQUIVALENT. 5.REMOVE LEAN MIXTURE SCREW PLUG AND THE RICH MIXTURE STOP SCREW PLUG FROM AIR HORN, USING A SUITABLY SIZED PUNCH. REFER TO PAGE 6C1-10 AND 6C1-11 IN THE 1982 CHASSIS SERVICE MANUAL. 6.REINSTALL RICH MIXTURE STOP SCREW IN AIR HORN AND BOTTOM LIGHTLY, THEN BACK SCREW OUT 1/4 TURN. 7.REMOVE IDLE AIR BLEED COVER. 8.REINSTALL AIR HORN GASKET, MIXTURE CONTROL SOLENOID PLUNGER AND AIR HORN TO CARBURETOR. INSERT EXTERNAL FLOAT GAGE IN VENT HOLE AND, WITH TOOL J-28696-10, BT-7928, OR EQUIVALENT, ADJUST RICH MIXTURE STOP SCREW TO OBTAIN 4/32" TOTAL PLUNGER TRAVEL. 9.WITH SOLENOID PLUNGER TRAVEL CORRECTLY SET, INSTALL PLUGS (SUPPLIED IN SERVICE KITS) IN THE AIR HORN, AS FOLLOWS: A.INSTALL PLUG, HOLLOW END DOWN, INTO THE ACCESS HOLE TO LEAN MIXTURE (SOLENOID) SCREW, AND USE SUITABLY SIZED PUNCH TO DRIVE PLUG INTO THE AIR HORN UNTIL THE TOP OF THE PLUG IS EVEN WITH THE LOWER EDGE OF THE HOLE CHAMFER. PLUG MUST BE INSTALLED TO RETAIN THE SCREW SETTING AND TO PREVENT FUEL VAPOR LOSS. B.INSTALL PLUG, WITH HOLLOW END DOWN, OVER THE RICH MIXTURE STOP SCREW ACCESS HOLE, AND DRIVE PLUG INTO PLACE SO THAT THE TOP OF THE PLUG IS 1/16" BELOW THE SURFACE OF THE AIR HORN CASTING. PLUG MUST BE INSTALLED TO RETAIN SCREW SETTING. IDLE AIR BLEED VALVE 1.PRESETTING THE IDLE AIR BLEED VALVE A.INSTALL IDLE AIR BLEED VALVE GAGING TOOL J-33815-2, BT-8253-B, OR EQUIVALENT, IN THROTTLE LEVER SIDE "D" SHAPED VENT HOLE IN THE AIR HORN CASTING. THE UPPER END OF THE TOOL SHOULD BE POSITIONED OVER THE OPEN CAVITY NEXT TO THE IDLE AIR BLEED VALVE (SEE FIG. 4). B.WHILE HOLDING THE GAGING TOOL DOWN LIGHTLY, SO THAT THE SOLENOID PLUNGER IS AGAINST THE SOLENOID STOP, ADJUST THE IDLE AIR BLEED VALVE SO THAT THE GAGING TOOL WILL PIVOT OVER AND JUST CONTACT THE TOP OF THE VALVE. THE VALVE IS NOW PRESET FOR ON-CAR ADJUSTMENT (SEE FIG. 4). C.REMOVE GAGING TOOL. 2.ADJUSTING THE IDLE AIR BLEED VALVE A.CONNECT DWELL METER TO M/C SOLENOID DWELL TERMINAL (6 CYLINDER SCALE). B.START ENGINE AND ALLOW IT TO REACH NORMAL OPERATING TEMPERATURE. C.WHILE IDLING IN DRIVE, USE A SCREWDRIVER TO SLOWLY TURN VALVE COUNTERCLOCKWISE OR CLOCKWISE, UNTIL THE DWELL READING VARIES WITHIN THE 35-40F RANGE, ATTEMPTING TO BE AS CLOSE TO 40F AS POSSIBLE. PERFORM THIS STEP CAREFULLY. THE AIR BLEED VALVE IS VERY SENSITIVE AND SHOULD BE TURNED IN 1/8 TURN INCREMENTS ONLY. D.IF, AFTER PERFORMING STEPS B AND C ABOVE, THE DWELL READING IS NOT WITHIN THE 35-40F RANGE, IT WILL BE NECESSARY TO REMOVE THE PLUGS AND ADJUST THE IDLE MIXTURE NEEDLES. 3.IDLE MIXTURE NEEDLE PLUG REMOVAL - ONLY IF NECESSARY: A.REMOVE THE CARBURETOR FROM THE ENGINE, FOLLOWING NORMAL SERVICE PROCEDURES, TO GAIN ACCESS TO THE PLUGS COVERING THE IDLE MIXTURE NEEDLES. B.INVERT CARBURETOR AND DRAIN FUEL INTO A SUITABLE CONTAINER. C.PLACE CARBURETOR ON A SUITABLE HOLDING FIXTURE, WITH MANIFOLD SIDE UP. USE CARE TO AVOID DAMAGING LINKAGE, TUBES, AND PARTS PROTRUDING FROM AIR HORN. D.MAKE TWO PARALLEL CUTS IN THE THROTTLE BODY, ONE ON EACH SIDE OF THE LOCATOR POINTS BENEATH THE IDLE MIXTURE NEEDLE PLUG (MANIFOLD SIDE), WITH A HACKSAW. THE CUTS SHOULD REACH DOWN TO THE STEEL PLUG, BUT SHOULD NOT EXTEND MORE THAN 1/8" BEYOND THE LOCATOR POINTS. THE DISTANCE BETWEEN THE SAW CUTS DEPENDS ON THE SIZE OF THE PUNCH TO BE USED. E.PLACE A FLAT PUNCH NEAR THE ENDS OF THE SAW MARKS IN THE THROTTLE BODY. HOLD THE PUNCH AT A 45F ANGLE AND DRIVE IT INTO THE THROTTLE BODY UNTIL THE CASTING BREAKS AWAY, EXPOSING THE STEEL PLUG. THE HARDENED PLUG WILL BREAK, RATHER THAN REMAIN INTACT. IT IS NOT NECESSARY TO REMOVE THE PLUG IN ONE PIECE, BUT REMOVE THE LOOSE PIECES. F.REPEAT THIS PROCEDURE WITH THE OTHER MIXTURE NEEDLE. G.USING TOOL J-29030-B, BT-7610B, OR EQUIVALENT, TURN BOTH IDLE MIXTURE NEEDLES CLOCKWISE UNTIL THEY ARE LIGHTLY SEATED, THEN TURN EACH NEEDLE COUNTERCLOCKWISE THE NUMBER OF TURNS SPECIFIED BELOW. CARBURETOR 17082253 NO. OF TURNS 3-3/4 CARBURETOR 17082255 NO. OF TURNS 4 H.REINSTALL CARBURETOR ON ENGINE USING A NEW FLANGE MOUNTING GASKET, BUT DO NOT INSTALL AIR CLEANER AND GASKET AT THIS TIME. I.START ENGINE AND RUN UNTIL FULLY WARM, AND REPEAT "ADJUSTING THE AIR BLEED VALVE", STEP 2, ON PREVIOUS PAGE. J.IF UNABLE TO SET DWELL TO 35-40F, AND THE DWELL IS BELOW 35F, TURN BOTH MIXTURE NEEDLES COUNTERCLOCKWISE ONE ADDITIONAL TURN. READJUST IDLE AIR BLEED VALVE TO OBTAIN DWELL LIMITS. AFTER ADJUSTMENTS ARE COMPLETE, SEAL THE IDLE MIXTURE NEEDLE OPENINGS IN THE THROTTLE BODY, USING SILICONE SEALANT, RTV RUBBER, OR EQUIVALENT. THE SEALER IS REQUIRED TO DISCOURAGE UNNECESSARY ADJUSTMENT OF THE SETTING, AND TO PREVENT FUEL VAPOR LOSS IN THAT AREA. IDLE SPEED RECHECK ILC AND BASE IDLE SCREW FOR PROPER ADJUSTMENT. WARRANTY INFORMATION (OLDSMOBILE) OPERATION PROM REPLACEMENT (ONLY) YEAR 1982 OPERATION NO. J 6364 LABOR TIME 0.5 T/C 92 FAILED P/N 1226377 IF CARBURETOR ADJUSTMENTS ARE PERFORMED, SUBMIT AS A SEPARATE CLAIM, THE APPROPRIATE LABOR OPERATION FROM THE 1982 LABOR TIME GUIDE. A SYSTEM PERFORMANCE CHECK IS NOT REQUIRED FOR THIS REPAIR.

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.