Mercury MerCruiser MCM 454 Mag MPI Service Manual page 571

FUEL INJECTION SYSTEM TROUBLESHOOTING
Surges and/or Chuggles Symptom (Continued)
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Index
Page 5D-12
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1. Check integrity of the primary and
secondary wiring.
2. Check routing of the wiring.
3. Check condition of IC module,
pick-up coil, distributor cap, rotor
and spark plug wires.
4. If a problem is found, repair as
necessary.
Was a problem found?
1. Remove spark plugs and check for
wet plugs. cracks, wear, improper
gap, burned electrodes or heavy
deposits.
Refer to Distributor Ignition System
in "Description and System Opera-
tion" section.
NOTE: If park plugs are gas or oil fouled,
the cause of the fouling must be deter-
mined before replacing the spark plugs.
2. If a problem is found, repair as
necessary.
Was a problem found?
1. Check fuel delivery system items
that can cause the engine to run rich.
2. If a problem is found, repair as
necessary.
Was a problem found?
1. Check fuel delivery system items
that can cause the engine to run
lean.
2. If a problem is found, repair as
necessary.
Was a problem found?
1. Check the injector connections for
proper mating.
2. If any of the injectors connectors are
connected to an incorrect cylinder,
correct as necessary.
Was a problem found?
1. Check ECM grounds for being
clean, tight and in the proper
locations.
2. If a problem is found, repair as
necessary.
Was a problem found?
SERVICE MANUAL NUMBER 23
Go to OBD
System
- Go to Step 10
Check
Go to OBD
System
Go to Step 11
-
Check
Go to OBD
System
- Go to Step 12
Check
Go to OBD
System
- Go to Step 13
Check
Go to OBD
System
Go to Step 14
-
Check
Go to OBD
System
- Go to Step 15
Check
90-861326--1 MARCH 1999