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LP Engine G430 (3.0L)
Igntion System
Delco Electronic Spark Timing
(EST) Distributor Service
General Description
Figure 6-22 Delco Electronic Spark Timing (EST)
Distributor
The Delco EST ignition system consists of the
distributor, ignition coil, wiring and spark plugs. The
distributor contains a module, pickup coil and
conventional cap and rotor. There are no points or
condenser to adjust or change and no moving parts
except for the distributor shaft and rotor. Spark
advance and dwell are controlled by the distributor
module. The distributor module and pickup coil are
self-contained solid-state devices which are not
repairable. If necessary, they may be replaced
separately but must be serviced as a complete unit.
EST Distributor Component Testing
NOTICE
In the test procedures that follow, check the ignition
coil and each component of the distributor separately
to identify defective or good components. These tests
can be made with the distributor and coil mounted on
the engine or on the repair bench.
Module Testing
NOTICE
An approved module tester must be used in order to
check the module. Use a Kent-Moore Module Tester,
Part No. J 24642 F or equivalent.
Figure 6-23 Test 1 Tester Connections
1. Remove module from distributor.
2. Connect red battery-cable clamp to positive (+)
terminal and black battery-cable clamp to negative
(-) terminal of a fully charged 12V battery.
3. Connect J 24642-85 adapter to yellow 2-way
terminal connector, and J 24642-85 adapter to
black 3-way connector of the tester (figure 6- 23).
22664-018
600-058
