5.0/5.7/6.0L/8.1L Symptoms 7 - 7
MEFI 4 - PCM
Surges and/or Chuggles Symptom
Step Action Value Yes No
1. Remove spark plugs and check for wet plugs, cracks,
wear, improper gap, burned electrodes or
heavy deposits.
• Refer to Distributor Ignition System.
11 Notice: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 12
1. Check items that can cause the engine to run rich.
12 2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 13
1. Check items that can cause the engine to run lean.
13 2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 14
1. Check the injector connections for proper mating.
14
2. If any of the injectors connectors are connected to an
incorrect cylinder, correct as necessary.
Go to OBD
Was a prob3nd? — System Check Go to Step 15
1. Check ECM grounds for being clean, tight and in the
15
proper locations.
2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 16
1. Visually/physically check vacuum hoses for splits, kinks
16
and proper connections and routing.
2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 17
1. Check for proper alternator voltage output.
17
2. The voltage should be between specifi ed values.
3. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? 11-16V System Check Go to Step 18
1. Review all diagnostic steps within this procedure.
2. If all steps have been completed and no
malfunctions have been found, review/inspect
the following:
18
• Visual/physical inspection.
• Scan tool data.
• All electrical connections within a suspected circuit
and/or system.
3. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Contact OEM