Porsche 928 Workshop Manual page 503

928
Ignition System
28
TROUBLESHOOTING ELECTRONIC IGNITION SYSTEM (BOSCH TRANSISTORIZED
IGNITION SYSTEM)
Testing Prerequisites:
Rattery fully charged, fuel in tank. engize or
ambientotemperature between 0 and + 40 C/ 32
and 104 F (temperature has considerable influ-
ence on test values).
Note especially information concerning dangers
of electronic ignition systems (see page 28 - 3).
Starter turns. engine will not start or does not
develop sufficient power.
1. Connect spark gap tester to ignition coil ter-
minal 4 and set length at 12 mm. Start engine.
12 mm spark gap present,
L-
no
go to point
1
2. Check distributor cap. distributor rotor, igni-
tion cables and spark plugs.
Printed in Germany - I, I978
Troubleshooting Electronic Ignition System
28 - 11