3C-12 - FUEL SYSTEMS 90-824052R3 JUNE 2002
Preliminary Steps
Ignition Spark Check
Purpose: This test determines if the ignition system
is delivering usable spark to the spark plugs.
By performing this test, the probable cause
can be isolated to either the ignition system or
fuel system.
Procedure: STEP 1: Disconnect all spark plug
wires from spark plugs.
STEP 2: Connect spark gap tester Quicksilver
(91-63998A1) to No. 1 spark plug wire
and to good ground on engine.
STEP 3: Connect Remote Starter Switch Quick-
silver (P/N 91-52024A1).
a. Connect red lead from switch to large positive
(+) terminal with red banded cable attached
[(+) cable from battery].
b. Connect YELLOW lead from switch to small
terminal with yellow/red lead attached.
STEP 4: Turn ignition key switch to the “ON” posi-
tion.
OFF
ON
START
STEP 5: Turn over engine using remote starter
switch.
STEP 6: Look at spark gap tester viewing port for
presence of good quality spark. Com-
plete steps 1 through 6 on each spark
plug.
Results: IMPORTANT: The presence of a good
spark will not necessarily indicate condi-
tion of timing. Ignition timing may be off
far enough to prevent the engine from
starting, but still allow a good spark to be
present in the spark gap tester.
A steady, blue spark should be present at each spark
plug wire. If a good spark is present, problem may not
be ignition related. If good spark is not present, prob-
lem may be ignition related. Trouble shoot ignition
system or make sure engine timing is set correctly.
Refer to appropriate ignition section in this service
manual.
Ignition system failure (switch box, stator, trigger,
etc.) can cause fuel delivery problems. Injectors are
triggered in pairs by one, three, five primary circuits
(inner switch box).
No. 1 Primary Triggers No. 3 & 4 Injectors
No. 3 Primary Triggers No. 5 & 6 Injectors
No. 5 Primary Triggers No. 1 & 2 Injectors
Failure in one or more of these primary circuits will
cause no spark and no fuel to respective cylinders
(above). Check spark and spark plugs on all cylin-
ders before attempting EFI tests.
Electronic Fuel Injection Set Up
IMPORTANT: Follow EFI Timing/Synchronizing/
Adjustment section 2C before attempting tests
on EFI system.
EFI set up procedures must be followed before tests
on system are performed (refer to Section 2C).
Improper set up can result in poor engine
performance (i.e. uncontrollable idle speeds, lean
sneezing, low power during acceleration or engine
will simply not run.) Failure to properly set up the EFI
system can lead to misdirections in solving simple
problems in the EFI system.
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