CAMPAIGN: CARBURETOR THROTTLE BODY ASSEMBLY. Oldsmobile Custom Cruiser 1986

For 1990-2009 cars

# CAMPAIGN: CARBURETOR THROTTLE BODY ASSEMBLY

#### MODELS/YEARS: 1986 CUSTOM CRUISER

#### CONDITION

General Motors has determined that the carburetor throttle body assembly on certain 1986 Oldsmobile Custom Cruiser station wagons may have been damaged during vehicle assembly. As a result, the primary throttle valves may not provide the proper air/fuel mixture causing poor engine idle quality. In addition the transmission throttle valve (T.V.) cable may have been improperly adjusted.

To correct this condition, the carburetor throttle body assembly is to be replaced and the T.V. cable adjusted as outlined in the service procedure section of this bulletin.

#### VEHICLES INVOLVED

A total of 53 Oldsmobile Custom Cruiser Staton Wagons are involved in this campaign. Vehicle identification numbers of the involved vehicles are listed below.

1G3BP35Y3G9016901 1G3BP35YOG9016919 1G3BP35Y6G9016973 1G3BP35Y5G9016902 1G3BP35Y7G9Ol6920 1G3BP35Y8G9016974 1G3BP35Y7G9016903 1G3BP35Y9G9016921 1G3BP35YXG9016975 1G3BP35Y9G9016904 1G3BP35YOG9016922 1G3BP35YlG9016976 1G3BP35YOG9016905 1G3BP35Y2G9016923 1G3BP35Y3G9016977 1G3BP35Y2G9016906 1G3BP35Y4G9016924 1G3BP35Y5G9016978 1G3BP35Y4G9016907 1G3BP35Y6G9016925 1G3BP35Y7G9016979 1G3BP35Y6G9016908 1G3BP35YBG9016926 1G3BP35Y3G9016980 1G3BP35Y8G9016909 1G3BP35YXG9016927 1G3BP35Y5G9016981 1G3BP35Y4G9016910 1G3BP35YlG9016928 1G3BP35Y7G9016982 1G3BP35Y6G9016911 1G3BP35Y3G9016929 1G3BP35Y9G9016983 1G3BP35Y8G9016912 1G3BP35YXG9016930 1G3BP35YOG9016984 1G3BP35YXG9016913 1G3BP35Y1G9016931 1G3BP35Y2G9016985 1G3BP35YlG9016914 1G3BP35Y3G9016932 1G3BP35Y4G9016986 1G3BP35Y3G9016915 1G3BP35Y5G9016933 1G3BP35Y6G9016987 1G3BP35Y5G9016916 1G3BP35YOG9016970 1G3BP35Y8G9016988 1G3BP35Y7G9016917 1G3BP35Y2G9016971 1G3BP35YXG9016989 1G3BP35Y9G9016918 1G3BP35Y4G9016972

#### DEALER ACTION

Dealers are to service all vehicles subject to this campaign at no charge to owners, regardless of mileage, age of vehicle, or ownership, from this time forward.

Whenever a vehicle subject to this campaign is taken into your new or used vehicle inventory, or it is in your dealership for service in the future, you should take the steps necessary to be sure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer and arrangements made to make the required correction according to instructions contained in this bulletin.

#### SERVICE PROCEDURE

1. Open hood, install fender covers and disconnect the negative battery cable.

2. Remove air cleaner.

3. Disconnect the following:

o Throttle return spring.

o Accelerator control cable at carburetor.

o Transmission throttle valve (T.V.) cable at carburetor (see page 7A2-6, Fig. 4 of the 1986 Custom Cruiser Service Manual).

o Cruise control linkage (if equipped).

o All vacuum lines to carburetor. Use of masking tape to label vacuum line position will ease reassembly.

o Electrical connectors to carburetor.

o Choke heat pipe.

o Fuel line, at carburetor inlet.

4. Remove four carburetor mounting bolts and remove carburetor and flange (base) gasket.

5. Drain gasoline from carburetor and dispose of properly.

#### CAUTION:

Never drain or store gasoline in an open container due to the possibility of fire or explosion.

6. Place carburetor on carburetor holding stand J 9789-118, BT-3553 or equivalent.

7. Remove accelerator pump link retainer and disengage pump link from pump lever. Refer to Figure 1.

8. Remove air horn screws number 6 and 7 from carburetor. Refer to Figure 2.

9. Turn carburetor over and remove:

a. Throttle body to float bowl attachment screws.

b. Throttle body from carburetor.

c. Pipe plug from rear of throttle body.

d. Float bowl to throttle body gasket.

10. Disconnect and remove accelerator pump link from throttle body.

11. Install:

a. New float bowl to throule body gasket on carburetor. (Now gasket is supplied in throule body kit. Refer to parts information in this bulletin).

b. Accelerator pump link to new throttle body.

c. New throttle body to carburetor.

d. Throttle body to float bowl attachment screws and tighten screws.

12. Turn carburetor over. Install and tighten two air horn screws previously removed and tighten all other air horn screws in the sequence shown. Refer to Figure 2.

13. Connect accelerator pump link to pump lever and install retainer. Refer to Figure 1.

14. Using tool J 29030-B, BT-7610B, or equivalent, turn both mixture needles clockwise until lightly seated,

15. Turn each mixture needle counterclockwise 3 turns.

16. Clean carburetor sealing surface on intake manifold and install carburetor with new flange (base) gasket supplied in throttle body kit.

17. Install four carburetor mounting bolts and tighten to 16 N-m (12 lbs. ft.) in the following sequence,

a. Left rear b. Right front c. Right rear d. Left front

18. Reinstall the following:

o Accelerator control cable. Make certain that the retainer tang is secured over the throttle lever stud.

o Throttle return spring.

o Transmission throttle valve (T.V.) cable and adjust as outlined on page 7A-7 of the 1986 Custom Cruiser Service Manual.

o Cruise control linkage, if equipped. Lube carburetor end with 1052541 lubricant prior to installation.

o All vacuum lines to carburetor.

o Electrical connectors to carburetor.

o Choke heater pipe. (Tighten to 11 N - m, 95 lbs. in.)

o Fuel line at carburetor inlet. (Tighten to 41 N - m, 30 lbs. ft.)

o Pipe plug in rear of throttle body. Coat plug with 1052080 sealer and tighten to 10 N - m (88 lbs. in.).

19. Adjust the idle mixture needles as follows.

IF THE IDLE AIR BLEED VALVE COVER ON THE CARBURETOR AIR HORN HAS BEEN PREVIOUSLY REMOVED, IT WILL BE NECESSARY TO ADJUST THE IDLE AIR BLEED VALVE SETTING PRIOR TO IDLE MIXTURE NEEDLE ADJUSTMENT. REFER TO PAGE 6E1-C2A-7 IN THE 1986 CUSTOM CRUISER SERVICE MANUAL FOR IDLE AIR BLEED VALVE ADJUSTMENT.

a. Disconnect canister purge vacuum hose at canister and plug hose.

b. Plug air cleaner vacuum line.

c. Connect dwell meter to the mixture control solenoid test connector.

d. With transmission in park, parking brake set and drive wheels blocked, start engine. Check for fuel leaks and correct if necessary.

e. Allow engine to run until warm. (Upper radiator hose warm to touch and choke open.) Ensure fast idle cam is down completely.

f. Place vehicle in drive.

g. While idling in Drive adjust both mixture needles equally, in 1/8 turn increments, until dwell reading varies within the 25-35" range, attempting to be as close to 300 as possible. if reading is too low, turn mixture needies counterclockwise. if reading too high, turn mixture needies clockwise. Allow time for dwell reading to stabilize after each adjustment.

IF DWELL READING BECOMES FIXED, THE O2 SENSOR HAS PROBABLY COOLED OFF (OPEN LOOP). TO WARM THE O2 SENSOR (CLOSED LOOP) PLACE TRANSMISSION IN PARK AND FLASH THE THROTTLE 3 OR 4 TIMES.

h. After adjustments are complete, seal the idle mixture needle opening in the throule body, using silicone sealant, RTV rubber, or equivalent.

20. Adjust idle load compensator (ILC) as outlined on page 6El-C2A-11 of the 1986 Custom Cruiser Service Manual.

21. Check the throttle body secondary lever for proper adjustment of the following. Adjust if necessary.

o Secondary lockout. Refer to Figure 3. o Secondary closing. Refer to Figure 4. o Secondary opening. Refer to Figure 5.

22. Check and if necessary adjust the throttle position sensor (TPS) as outlined on page 6E 1 -C2A-15 in the 1986 Custom Cruiser Service Manual.

IF TPS ADJUSTMENT IS REQUIRED, REMOVE EXISTING TPS SCREW AND INSTALL THE NEW TPS SCREW INCLUDED IN THROTTLE BODY KIT PRIOR TO MAKING ADJUSTMENT.

23. Following instructions on the vehicles emission control label, adjust engine fast idle. It is not necessary to adjust ignition timing.

24. Clear trouble codes in ECM memory by removing the 10 amp ECM fuse from fuse panel for 5 seconds.

25. If equipped with cruise control, check and if needed, adjust the servo rod length as described on page 9B-3 (Fig. 2) of the Custom Cruiser Service Manual.

26. Inspect all carburetor linkage for proper operation.

27. Install air cleaner.

28. Install campaign identification label.

#### CAMPAIGN IDENTIFICATION LABEL INSTALLATION

Each vehicle modified in accordance with the instructions outlined in this procedure will require a Campaign identification label. Each label provides a space to include the campaign number, the (5) digit dealer code of the dealer performing the campaign service, and the date the vehicle was campaigned. This information may be inserted with a typewriter or ballpoint pen. When installing label, clean the surface of the radiator upper mounting suppon and apply the campaign label where it is readily visible.

#### PARTS INFORMATION

Since only a small number of Oldsmobile are involved, throttle body assembly kits, which include necessary gaskets, are being shipped directly to Oldsmobile zone offices that have dealers with cars involved. Dealers that require parts should contact their zone office. Zone offices will supply the dealer parts on a "no charge" basis. They will not be billed on the dealer parts account. Dealers should not order from GMSPO.

#### CLAIM INFORMATION

Failure Labor Labor Description Code Operation Hours ----------- ------- --------- ----- Install Throttle Body 96 V3990 1.4 Assembly and Adjust Carburetor.

.1 hour for clerical administration may be added to the above operation.

A parts allowance of $30.58 (30% of the dealer price of the "furnished" throttle body assembly kit) may be applied for in the Dealer material allowance column (sublet column) of the warranty claim.

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.