Mercury 3.0 Liter Service Manual download pdf (Page 43)

90-898303 2-39

2.4L & 2.5L - 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:

1) Disconnect all spark plug wires from spark plugs.

2) Connect spark gap tester Quicksilver (91-63998A1) to No. 1

spark plug wire and to good ground on engine.

a) Connect Remote Starter Switch Quicksilver (P/N 91-

52024A1).

b) Connect red lead from switch to large positive (+) terminal

with red banded cable attached [(+) cable from battery].

3) Connect YELLOW lead from switch to small terminal with

yellow/red lead attached.

4) Turn ignition key switch to the “ON” position.

5) Turn over engine using remote starter switch.

6) Look at spark gap tester viewing port for presence of good

quality spark. Complete steps 1 through 6 on each spark plug.

Results: 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, problem 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.

Notes

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Mercury 3.0 Liter Service Manual Page 43