Engine Performance - Hesitation or Jerking
Category Applicable Model/s Subject Bulletin No. 013/854 1986 B2000 DRIVEABILITY Issued 7/24/85
Revised 8/14/85
The revised section is indicated by an asterisk. Please replace pages 1-4 of 8 with these revised pages.
Table and Procedures:
DESCRIPTION
In order to improve the driveability, such as hesitation while accelerating or jerking after deceleration, a repair procedure and modified parts have been established. Please refer to the following table and procedures and use the correct parts because each area requires a different procedure and parts.
NOTE:
The * mark indicates that the modified HAC kit should be installed only if a customer complains about driveability at high altitude. Otherwise it is not necessary to install the modified HAC kit.
The ** mark shows that the modified HAC kit has been already installed in production.
The *** mark shows that the modified control unit has been already installed in production.
PARTS INFORMATION
PART NUMBER DESCRIPTION
FE71 23 349 Primary Main Air Bleed #60
FE85 20 305 EGR Gasket 6 mm dia.
* 8AU1 13 SB0B Modified High Altitude Compensator Kit
F807 13 945 Joint
FE85 18 881B Modified Control Unit
UB44 69 044D Vacuum Hose Routing Diagram Label
REPAIR PROCEDURE
The following repair procedures should be carried out as indicated by area.
CALIFORNIA
Procedure No. Description
1 Replacing P.MAB (#50) with modified one (#60)
3 Installing modified HAC kit
4 Installing joint instead of check valve
5 Replacing control unit (FE85A) with modified one (FE85B)
*6 Attach modified vacuum hose routing diagram label
* California only
FEDERAL (High Altitude Areas)
Procedure No. Description
1 Replacing P.MAB (#50) with modified one (#60)
4 Installing joint instead of check valve
5 Replacing control unit (FE85A) with modified one (FE85B)
FEDERAL (Except High Altitude Areas) & CANADA
Procedure No. Description
1 Replacing P.MAB (#50) with modified one (#60)
2 Installing EGR gasket (6 mm dia.)
* *3 Installing modified HAC kit
4 Installing joint instead of check valve
** Carry out the installation of the modified HAC kit only if a customer complains about driveability caused by high altitude. Otherwise it is not necessary to install the modified HAC kit.
Primary Main Air Bleed:
The detailed repair procedures are as follows:
1. Replacing Primary Main Air Bleed #60 (P/N; FE71 23 349)
Remove the air cleaner and air horn from the carburetor main body. Replace the primary main air bleed (#50) with the modified one (#60).
Check the float level according to the 1986 B2000 Workshop Manual page 4-57.
Installing EGR Gasket:
2. Installing EGR Gasket 6 mm dia. (P/N; FE 85 20 305)
Install the EGR gasket between the intake manifold and the EGR control valve.
NOTE:
Sealant is unnecessary to the EGR gasket, as sealant is already applied.
3. Installing Modified High Altitude Compensator (HAC) Kit (P/N; 8AU1 13 SB0B)*
NO. PART NUMBER DESCRIPTION QTY
1 FE85 20 480A Modified High Altitude Compensator 1 pc.
2 FE85 20 481 High Altitude Compensator Bracket 1 pc.
3 FE85 20 470A Vacuum Tube Assembly 1 pc.
4 UB40 69 036A Vehicle Emission Control Information Label 1 pc.
5 9970 93 200 Tie-wrap 2 pcs.
6 9978 60 612 Bolt 2 pcs.
6 9979 60 612 Bolt 2 pcs.
High Altitude Compensator:
INSTALLATION PROCEDURE
a. Install the modified high altitude compensator and bracket as shown in the figure below.
Vacuum Tubes:
b. Install the vacuum tubes and secure them with tie-wraps as shown in the figure below.
NOTE:
Do not use the vehicle emission control information label contained in the HAC kit for the vehicles in California, Federal (except high altitude areas) and Canada. The emission label can be used only for Federal high altitude areas.
Installing Joint:
4. Installing Joint (P/N; F807 13 945)
Remove and discard the check valve which is installed between the intake manifold and the EGR duty solenoid valve then install the joint in place of the check valve.
Replacing Modified Control Unit:
5. Replacing Modified Control Unit (P/N; FE85 18 881B)
The modified control unit has been installed since the production date of March, 1985. If the vehicle being checked is produced prior to the VIN listed below, replace the control unit with the modified one (FE85B).
VIN OF PRODUCTION CHANGE
JM1UF111 G0523720 JM1UF211 G0523720
NOTE:
There is a possibility that some vehicles produced prior to or near to the above mentioned VIN may have the modified control unit (FE85B) installed. For this reason, check the ID number on the front side of the control unit. Replace the control unit only if the ID number is FE85A.
Modified Vacuum Hose Routing Diagram Label:
6. Attaching Modified Vacuum Hose Routing Diagram Label (P/N; UB44 69 044D) (California Only)
Attach the modified vacuum hose routing diagram label over the current one.
NOTE:
Clean the surface of the current label prior to attaching the modified one. It is necessary to order an additional modified vacuum diagram label additionally in California.
7. After all required repair procedures have been completed, carry out the following idle adjustment procedure.
IDLE ADJUSTMENT:
IDLE ADJUSTMENT
1. Warm up the engine to normal operating temperature.
2. Attach a tachometer.
3. Make sure that all electrical loads (such as cooling fan, heater blower motor, headlights, etc.) are off.
4. Turn TAS to set idle rpm as follows.
(NOTE: Do not turn MAS for adjustment)
a) Adjusting at low altitude (example: at port).
850-900 rpm
b) Adjusting at high altitude (example: at high altitude dealers).
WARRANTY INFORMATION
Customer Comment Code: 1H
Damage Code: 31
Authorization No: B5-017A
Pan No. of Main Cause: FE71 23 349
Operation No. & Labor Hour:
AREA PROCEDURE NO. VIN RANGE OPERATION NO. LABOR
HOUR
1, 3, 4, 5, 6 and 7 G0 500001-523719 XX0062-R-1 1.7
California
1, 3, 4, 6, and 7 G0 523720-and after XX0062-R-2 1.4
Federal 1, 4, 5 and 7 G0 500001-523719 XX0062-R-3 1.5
(High Altitude
Areas) 1, 4 and 7 G0 523720-and after XX0062-R-4 1.2
1, 2, 3, 4 and 7 G0 500001-and after XX0062-R-5 1.5
Federal
(Except High 1, 2, 4 and 7
Altitude Areas) (No .3 HAC kit
& Canada installation is not G0 500001-and after XX0062-R-6 1.2
carried out)