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Mercury MerCruiser MIE 7.4L MPI User Manual

Mercury MerCruiser MIE 7.4L MPI
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GENERAL SYSTEM DIAGNOSTICS SERVICE MANUAL NUMBER 23
Page 5E-86 90-861326--1 MARCH 1999
Chart A-7 (3 of 6): Ignition System Check (Continued)
Step Action Value(s) Yes No
1
Was the “On-Board Diagnostic”
(OBD) System Check
Performed?
-
Go to Step
2
Go to OBD
System Check
2
1. Check spark plug wires for
open circuits, cracks in
insulation, or improper seat-
ing of terminals at spark
plugs, distributor cap, and
coil tower before proceeding
with this table.
2. Disconnect 5-wire harness
connector (WHITE and PINK
wires).
3. Install a temporary jumper
wire between the 2 PINK
wires at the connector of the
boat harness. This is CkT 3
for the ignition circuit.
4. Check tor secondary spark. If
there is “no spark” at one
wire, check a few more wires.
A few sparks and then noth-
ing is considered “no spark.”
Is Adequate Spark Present At
All Cylinders?
_
Refer to Trou-
bleshooting
Section
Go to Step
3
3
Remove distributor cap and
verify rotation of distributor rotor.
Is The Distributor Rotor
Turning?
-
Go to Step
4 Go to Step
25
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Mercury MerCruiser MIE 7.4L MPI Specifications

General IconGeneral
BrandMercury
ModelMerCruiser MIE 7.4L MPI
CategoryEngine
LanguageEnglish

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