Engine - Cold Start Driveability Kit
84saab01SUBJECT:
SERVICE KIT TO IMPROVE DRIVEABILITY WITH COLD ENGINE - CERTAIN M82 AND ALL M83 NATURALLY - ASPIRATED 900
ISSUE: (900, 900S)
06/84-692
FILE IN S.I. MANUAL
VOLUME: I
SECTION: 2
PAGE 164
A service kit (P/N 85-46-921) is now available which alters the function the Lambda system until the engine coolant has risen to 77~F. This allows the engine and fuel system to stabilize before the Lambda system takes over mixture control and it improves driveability after a cold start of the naturally-aspirated engine.
The service kit may be fitted to specific naturally-aspirated M82 engines and all M83 naturally-aspirated engines having Lambda Electronic Control Unit P/N 93-45-216 (Bosch No. 0280-800 054). NOTE: It cannot be used on M82's with alternate "M81" Lambda systems identified by ECU P/N 93-37-718 (Bosch No. 0280-800 035), produced within VIN Serial No. ranges C1012287-29974 and C2006539-10800 (see S.I. 07782-581).
All other naturally-aspirated M82 models may be fitted with the service kit.
Installation Details:
Service Kit P/N 85-46-921 consists of the following individual components:
1 - Temperature Switch 1 - Gasket 1 - Harness 5 - Wire Clips
1. Drain the engine coolant to below the level of the thermostat housing.
2. Remove the large plug from the front of the thermostat housing.
3. Mount the sealing ring to the temperature switch and fit the switch to the housing. Refill, pressure check and bleed the cooling system.
4. Connect one end of the wiring harness to the temperature switch and route the harness along the existing wiring harness to the Emission Relay Panel. Attach the harness with the five cable ties included in the kit.
5. Detach the Emissions Relay Panel from the inner left wheel housing. Remove the relay board from the panel and remove the Decel Relay "E" (Manual Transmission only). Cars equipped with automatic transmission do not use a decel relay although the socket for the relay is there.
Run the wiring harness from the temperature switch through the rubber grommet of the Emission Relay Panel.
6. Remove Terminal 31 and Terminal X1 for the decel relay holder E.
7. Insert the terminal from the black wire of the new harness to position 31 of the relay holder E. It should snap into place and not push out. Connect the black wire of the existing harness to the connector of the black wire from the temperature switch.
Cut off the terminal of the red/ yellow wire which was removed from position X1 of the relay holder. Connect this end by means of the crimp connector and special crimping tool (Saab P/N 78-60-695) to the crimp connector of the new harness.
8. Refit the Decel System relay, the relay panel board and re-attach the entire assembly to the inner wheel housing.
9. Verify your repair as follows:
a. Connect a pulse relation meter.
b. Start the car and observe the pulse relation meter.
c. If engine coolant is below 64~F (18~C) the meter should lock on 60%.
d. When the temperature rises above 77~F (25~C) the meter should begin to oscillate normally.
e. A cold engine may be simulated for testing purposes by jumping the wire connections at the newly installed temperature switch.
WARRANTY INFORMATION: If a car is still in the new car warranty and an owner complaint has been made, this modification will be covered by warranty. There is no emissions warranty coverage. Use Failure Code 37135-00-0-01-05 and the time allowance is 0.8 hour which must be entered as straight time on the claim.