Adjusting Idle And Co, 1984 Models - Porsche 928 Workshop Manual

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928 LH-Jetronic 24
ADJUSTING IDLE SPEED AND CO
Note:
Requirement:
Engine in perfect mechanical condition
Make adjustments as quickly as possible to
avoid excessive heat in intake ports and
consequently wrong CO values.
1. Take off right air intake hose.
2. Disconnect auxiliary air pump hose on air
pipe and insert a suitable plug in open
air pipe (e. g. rubber grommet for doors,
Part No. 999.703.163.40).
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3. Install air intake hose.
5. Connect CO tester and separate tacho-
meter to supplier's instructions.
6. Turn control screw or bypass screw on
throttle housing, until speed of
700 + 50 ram is reached.
4. Run engine to operating temperature (oil
temperature approx. 80 to 90 "C/
176 to 194 "F).
Use Special Tool 9122 to measure oil
temperature.
Intake air temperature:
15 to 35 "C/59 to 95 OF.
Note:
Use separate tachometer from tester or
similar.
Printed in Germany "Ill, 1984
Adjusting Idle and CO, 1984 Models
24. 123