7 - 6 Symptoms 5.0/5.7/6.0/8.1L
MEFI 4 - PCM
Defi nition: Engine power variation under steady throttle or cruise. Feels like the vehicle speeds up and
slows down with no change in the accelerator pedal.
1
Was the “On-Board Diagnostic (OBD) System Check” Go to OBD
performed? — Go to Step 2 System Check
2
Was visual/physical check performed? Go to Visual/
— Go to Step 3 Physical check
1. Check for correct cam retard setting.
3
• Refer to Distributor Ignition section.
2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 4
1. Check for engine going into RPM reduction mode.
4 2. If a problem is found, repair as necessary. Go to OBD
Was a problem found? — System Check Go to Step 5
1. Check for contaminated fuel.
5
2. Check fuel fi lters and water separator.
3. If a problem is found, repair as necessary. Go to OBD
Was a problem found? — System Check Go to Step 6
1. Check for proper fuel pressure while the condition exists.
6
• Refer to Table A-4.
2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 7
1. Check for intermittent opens or short to grounds in the
ECT sensor, MAP sensor and TP sensor circuits. Also
7
check for throttle linkage sticking, binding or worn.
2. An intermittent failure may not store a DTC.
3. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 8
1. Check for proper ignition voltage output.
8
• Refer to Table A-7.
2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 9
1. Check ignition coil(s) for cracks or carbon tracking.
9 2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 10
1. Check integrity of the primary and secondary wiring.
2. Check routing of the wiring.
10
3. Check condition of IC module, CKP sensor, distributor
cap, rotor and spark plug wires.
4. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 11
Surges and/or Chuggles Symptom
Step Action Value Yes No
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