Test Point 12 - CO and Idle Speed Adjustments

TEST POINT 12

CO and idle speed adjustments

Note: Adjusting Requirements: Engine must be in perfect running condition.




1. Connect exhaust gas test line US 8023 or SUN 120 - 239 on test connection of catalytic converter.
2. Connect CO tester according to manufacturer's instructions.




3. Connect oil temperature tester 9122. Adjust test sensor to length of oil dipstick.
4. Run engine to operating temperature (oil temperature approx. 80° C/175° F).




5. Turn regulating screw or bypass screw on throttle housing until specified speed is reached. Use separate tachometer from tester or similar.

Note: Fan motor and a/c compressor must be switched off during adjustments.
Make adjustments as quickly as possible to prevent intake ports from becoming too hot, to avoid false CO reading.




6. Pull off rubber cap on plug for oxygen sensor and detach plug.


7. Check CO level. If CO level is not the specified value, correct the setting on the air flow sensor.
8. Connect plug for oxygen sensor again after finishing adjustments.
9. Coat threads of cap nut for test connection on catalytic converter with Bosch VS 140 16 Ft or Optimoly HT grease.
Torque specification: 30 Nm (22 ft lb).