DSG-423 ENGINE CONTROLS
08-39
Engine Concerns
SYMPTOM POSSIBLE CA U S E
Oil System Concerns
- High Oil Consumption
• Positive Crankcase Ventilation (PCV) System
• Oil Viscosity
• External Leaks
• Improper Oil Dipstick
• Valve Seals
• Cylinder Wall Taper Excessive
• Worn Piston Rings
Cooling System Concerns • Trapped Air
• Worn Drive Belt
• Worn Water Pump
• Stuck Thermostat
• Plugged Radiator (Internal & External)
• Dry Fuel System Running Rich
Exhaust System Concerns
(visible smoke)
- Black Smoke
- Blue Smoke
• Ignition System
• Fuel Delivery System
• Sticking Fuel Injector
• High Fuel Pressure
• PCV System
• Worn Piston Rings
• Worn Valve Guides
Fuel System Concerns • Leaky Lines
• Contaminated Fuel
• Excessive Alcohol in Fuel
• Incorrect Octane Rating
Engine Noise • Low Oil Pressure
• Oil Filter Restriction
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