Porsche 928 Workshop Manual page 403

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a
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928
LH-Jetronic Fuel Injection
24
CO adjusting value: 0.6 + 0.2 %
Turned clockwise
-richer mixture
Turned anticlockwise - leaner mixture
Note
If the CO level has to be corrected on the
air volume sensor, remove plug in bore
affording access to the idle speed CO
adjusting screw after removal of the aii
volume sensor.
5. Connect oxygen sensor plug and insert
plug in CO testing pipe after finishing
adjustments.
6. Connect separate tachometer to
supplier's instructions.
Idle speed adjusting value: 680+ 20 rpm.
7. Check and
adjust
idle speed.
This requires stopping the idle speed
charging control.
a) Connect test jacks B and C with a piece
of locally made wire. This stops idle
speed charging control.
b)
Check and adjust speed with, for
example, VAG Tester 1367.
8. Turn control screw (bypass) on throttle
housing with a standard screwdriver, e.g.
Hazet 428 7, until the specified speed of
680 ?; 20
rpm.
Printed in Germany _ x, 1984
Adjusting Idle
24 - 205