Porsche 928 Workshop Manual page 515

928 IgniLion System
ADJUSTING IGNITION TIMINC. - From 198" Model<
1. Run engine to operaring temperarure (oil rem-
perature abour 80 to 90' C/176 IO 194' F).
2. Connect engine tester. A positive terminal for
connection of resting equipment is located in
engine compartment.
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5. Adjust ignition timing IO 23' before TDC al
an engine speed of 3000 RPM.
Loosen and rum distributor to change ignition
riming.
6. Arrach vacuum hoses again
3. Connect timing light to ignition cable of
cylinder 1.
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4. Pull off both vacuum hoses at distributor.
Printed inGermany IV. 1980
Adjusting lgnirion Timing 28 23