MITSUBISHI
MOTOR SALES OF AMERICA, Inc.
TECHNICAL SERVICE BULLETIN
No: STB-87-14-008
SUBJECT :
1983 CORDIA/TREDIA EMISSIONS SERVICE CAMPAIGN
DATE: July,
1987
MODEL: 1983
Cordia/Tredia
CIRCULATE TO:
[ ] GENERAL MANAGER
[X] PARTS MANAGER
[X] TECHNICIAN
[X] SERVICE ADVISOR
[X] SERVICE MANAGER
[ ] WARRANTY PROCESSOR
[ ] SALES MANAGER
PURPOSE
This bulletin provides a detailed procedure for inspecting 1.8L l983-model California-specification Cordias and Tredias to correct any emissionscontrol system tampering which may have occurred on these models. A letter has been sent to all affected customers; a copy of this letter is
included on Page 9 of this bulletin.
Please note that the customer is not to be charged for the repairs covered by this bulletin. However, if other work is performed, for example
replacement of an air filter or other part or repairs requested by the customer, then these parts and repairs would require customer approval and
payment.
To achieve the desired results, it is important that the procedure be followed EXACTLY as given in this bulletin.
VEHICLES AFFECTED
This procedure applies to 1983-model California Cordia and Tredia models with manual and automatic transmission without limitation as to mileage.
It does not apply to any other models.
WARRANTY INFORMATION
Warranty Information Required Operations
(Items 1-9 below)
Labor Operation Code
14 30 06 90
Time, Hr.
1.3
1.Change ignition timing, adjust idle rpm, and
affix Authorized Modification Label
2.Adjust Sub-EGR valve
3.Clean or change spark plugs
4.Adjust accelerator cable
5.Change Primary Main Air Jet
6.Remove, clean and install air cleaner element
7.Clean carburetor on vehicle
8.Remove/install exhaust manifold heat protector
9.Preparation for service
Warranty Information Conditional Operations
(see next paragraph for definitions and details)
wAdd orifice to secondary throttle vacuum line
wCorrect tampering/misadjustment, items 1-4 below
1.Remove/Install carburetor
2.Adjust Mixture Adjusting Screw (MAS)
3.Check and adjust choke
4.Check and change Main Jet and Primary Jet
wReplace Exhaust Manifold
Labor Operation Code
14 30 06 91
14 30 06 92
14 30 06 93
Time, Hr.
0.1
1.0
0.6
REQUIRED OPERATIONS AND CONDITIONAL OPERATIONS
Required Operations
The "required operations" are performed on every car affected. These are as follows:
1.Change ignition timing adjust idle rpm, and affix Authorized Modification Label
2.Adjust Sub-EGR valve
3.Clean or change spark plugs
4.Adjust accelerator cable
5.Change Primary Main Air Jet
6.Remove, clean and install air cleaner element
7.Clean carburetor on vehicle
8.Remove/install exhaust manifold heat protector
9.Preparation for service
Conditional Operations
"Conditional operations" are performed only if there is a need for them - If inspection reveals evidence of tampering and/or misadjustment on the
carburetor, or if inspection of the exhaust manifold indicates the need for replacement. For example, if inspection of the carburetor shows tool marks
on the bowl cover screws, the carburetor should be removed and partially disassembled and the main jet and primary jet checked to see that they
are the proper sizes. Another example would be if inspection of the choke cover shows damage or evidence that the factor-installed attaching
screws have been removed, the choke must be adjusted to specifications and the cover reinstalled using new special screws. These operations are
not performed in cases where inspection shows that there has been no tampering or misadjustment.
Tjhe exhaust manifold is replaced only if inspection of the ID numbers cast into its upper surface shows that replacement is needed, or if it is
cracked.
"Conditional Operations" are listed below:
1.Check and adjust choke
2.Adjust Misture Adjusting Screw (MAS)
3.Remove/Install carburetor
4.Check and change Main Jet and Primary Jet
PARTS
No advance distribution of parts for this campaign has been made to dealers. All parts are available from the Western Parts Distribution Center.
Parts for all required and conditional operations are listed in Table I as follows:
* The following spark plugs may also be used:
NGK BPR6ES-11, or equivalent
DENSO W20EPR-U10, or equivalent
PARTS AND REPAIR PROCEDURES
1.With the car in a stall with ready access to an emissions analyzer, timing light, and
tachometer, raise the hood and install fender covers.
2.With the timing light, check ignition riming - engine fully warmed up, transmission in
Neutral, brake set, all accessories OFF and engine at normal curb idle speed (750 ± 100
rpm). Adjust if necessary to 8 degrees BTDC. Recheck idle rpm and adjust to 750 rpm.
3.Attach Authorized Modification Label to the underside of the hood in the location shown
in Figure 2.
4.Adjust the sub-EGR valve touch point as follows:
a)Slowly open the throttle and observe the engine speed at which the sub-EGR valve
linkage begins to move. This is the "touch point".
b)By turning the adjusting screw (Figure 2), adjust the touch point to the following speed:
M/T : 2300 rpm
A/T : 2500 rpm
NOTE: Turn screw clockwise to decrease touch rpm, counterclockwise to increase.
5.Apply a dab of white paint or nail polish to the threads of the Sub-EGR Adjusting Screw
so that further adjustment cannot be made without detection (Figure 2).
6.Check to see if the Mixture Adjusting Screw (MAS) seal has been removed. Figure 3. If
it has, perform an exhaust gas analysis. Adjust the MAS to bring CO to 0.5%. Recheck
and adjust idle speed to 750 rpm. Install a new MAS seal.
7.Remove test equipment and shut off the engine.
8.Remove all four spark plugs.
9.Check for cracked or chipped insulators, carbon fouling, and damaged gaskets. Clean
the plugs if they are serviceable. Check all electrode gaps and set to .039" - .043".
10. Reinstall or replace the spark plugs.
NOTE: If new, be sure plugs are gapped to .039" - .043".
11.Remove the air cleaner from the carburetor.
12.Clean the air cleaner element with compressed air, Figure 4.
13.Clean the outside of the carburetor. Look carefully for marks of tampering or
misadjustment. Check the choke valve for smooth operation. Inspect the Secondary Main
Air Jet for any dirt. Figure 5.
14.Using carburetor choke spray cleaner, clean the choke shaft and the Secondary Main
Air Jet.
15.If the car has an automatic transmission, you may have to install an orifice in the
secondary throttle vacuum line. Some cars already have this orifice - any car built after
the VIN shown below has one.
CORDIA with P/S:
JA3BF444*DZ800967
w/o P/S:
JA3BF444*DZ800990
TREDIA with P/S:
JA3BF464*DZ801013
w/o P/S:
JA3BF464*DZ801119
In addition, all Cordias and Tredias that have had the Performance Optimizing Program
modifications should already have orifices installed.
Install the orifice at the point shown in Figure 6.
16.Inspect the choke cover attaching screws shown in Figure 7 for evidence of
tampering. If no tampering is found, go to Step 19.
17.If tampering is found, remove the carburetor from the car. Remove the choke cover
and verify the position of the choke linkage shown in the illustrations on page 8. Adjust if
necessary as described.
18.Use Screw Kit MD606977 to reinstall the choke cover.
19.Clean and inspect the heads of the screws securing the float bowl cover. If you see
tool marks indicating that the cover has been removed and reinstalled, go to the next
step. If not, go to Step 22.
20 .Remove the float bowl cover. Check the size of the main and pilot jets. Replace any
that are not the same as the specifications in the table shown below.
21.Reinstall the float bowl cover.
22.Replace the Primary Main Air Jet with a new one. See Figure 8 for location. Loosen
the jet with a 4mm screwdriver.
NOTE: The red plastic nozzle extension from a WD-40 can is a handy tool for removing
the jet from the carburetor. Use the proper jet from the table below.
23.Remove the exhaust manifold heat protector. Check the ID number molded into the
top of the exhaust manifold. Figure 9. Take action as shown in the table below. If the
manifold is cracked, replace it.
24.Reinstall the carburetor and adjust the accelerator cable as described below. See
Figure 10.
a)Make sure the engine is at curb idle and that the choke is fully open.
b)Check accelerator cable free play. It should be 0-2 mm.
c)If not, loosen the adjusting nut and reposition the cable to obtain the desired free play
at 0-2 mm.
25.Remove fender covers and prepare the vehicle for delivery to the customer.
AUTOMATIC CHOKE INSPECTION AND ADJUSTMENT
a)The middle mating line should be mated with the punched mark as shown in Fig. (a).
Adjust if necessary.
b)The punched mark portion of the choke lever should be mated with the color marker ink applied to the tooth of the choke pinion as shown in Fig.
(b).
Adjust if necessary.