PleasureCraft Engine Group 5.0L User Manual

7 - 10 Symptoms 5.0/5.7/6.0/8.1L
MEFI 4 - PCM
Detonation/Spark Knock Symptom
Step Action Value Yes No
Defi nition: A mild to severe ping, usually worse under acceleration. The engine makes sharp metallic knocks
that change with throttle opening.
Was the “On-Board Diagnostic (OBD) System Check” Go to OBD
1
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 base ignition timing.
• Refer to “Ignition Timing Set Procedure” in the
3
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 proper operation of Ignition Control (IC)
4
circuit and the Knock Sensor (KS) circuit(s).
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 good ignition system ground.
5
2. Check spark plugs for proper gap and heat range.
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 contaminated fuel.
6
2. Check for poor fuel quality and proper octane rating.
3. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 7
1. Check for proper fuel pressure.
7
• 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 8
8 Is a scan tool being used? — Go to Step 9 Go to Step 10
If scan tool readings are normal (Refer to “Typical Scan
Values”) and there are no engine mechanical faults, fi ll fuel
9 tank with a known quality gasoline that has a minimum
octane reading of 92 and re-evaluate vehicle performance.
Go to OBD
Is detonation present? — Go to Step 10 System Check
1. Check for obvious overheating problems:
• Loose water pump belt.
• Faulty or incorrect water pump.
10 • Restriction in cooling system.
• Faulty or incorrect thermostat.
2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 11
1. Check items that can cause an engine to run lean.
11 2. If a problem is found, repair as necessary.
Go to OBD
Was a problem found? — System Check Go to Step 12

PleasureCraft Engine Group 5.0L Specifications

General

Brand	PleasureCraft Engine Group
Model	5.0L
Category	Engine
Language	English