Buick Encore: Engine Performance Diagnostic Routine Outline
NOTE: This article is generic in nature and all information does not apply to all vehicles. For vehicle specific information, see the appropriate articles in the ENGINE PERFORMANCE category.
WHERE DOES DRIVEABILITY DIAGNOSIS START?
PERFORM BASIC INSPECTION
NOTE: This article is generic in nature and all information does not apply to all vehicles. For vehicle specific information, see the appropriate articles in the ENGINE PERFORMANCE category.
- Verify Customer Complaint
- Check for Relevant Technical Service Bulletins (TSBs)
- Perform Visual Inspection (See Basic Diagnostic Procedures)
- Test Engine Sub-Systems (See Basic Diagnostic Procedures)
- Mechanical Condition (Compression)
- Ignition Output
- Fuel Delivery
- Check Air Induction System For Leaks
- Check & Adjust Basic Engine Settings(See On-Vehicle Adjustments)
- Ignition Timing
- Idle Speed
CHECK FOR TROUBLE CODES
NOTE: This article is generic in nature and all information does not apply to all vehicles. For vehicle specific information, see the appropriate articles in the ENGINE PERFORMANCE category.
- Check for Diagnostic Trouble Codes (DTCs).(See Self-Diagnostics)
- Repair cause of DTCs.
- Clear PCM memory and repeat self-test.
DIAGNOSE SYMPTOM
NOTE: This article is generic in nature and all information does not apply to all vehicles. For vehicle specific information, see the appropriate articles in the ENGINE PERFORMANCE category.
- If no self-diagnostics available, or no trouble codes present, identify symptom.
- See trouble shooting procedure to identify problem. (See Trouble Shooting - No Codes)
TEST SYSTEM
NOTE: This article is generic in nature and all information does not apply to all vehicles. For vehicle specific information, see the appropriate articles in the ENGINE PERFORMANCE category.
- Perform required tests. (See Systems & Component Testing)
- Verify complaint is repaired.
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Engine Performance Safety Precautions
Always refer to Emission Decal in engine compartment before servicing
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differ, always use decal specifications.
Do not allow or create a condition of misfire in more
Gear Tooth Contact Patterns
NOTE: This is GENERAL information. This article is not intended to
be specific to any
unique situation or individual vehicle configuration. For model-specific
information see appropriate articles whe
General Cooling System Service
This article is generic in nature and all information does not apply to all
vehicles including those without a
liquid cooling system. For vehicle specific information, see the appropriate
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SEE MORE:
Squeaks and Rattles
DIAGNOSTIC INFORMATION AND PROCEDURES
SQUEAKS AND RATTLES
NOTE: Squeaks and rattles are caused by improperly controlled
relative motion
between vehicle components. There are 4 ways to prevent squeaks and
rattles.
Attach the component that squeaks or rattles securely.
Separate the components that
Diagnostic information and procedures
SYMPTOMS - ENGINE MECHANICAL
Strategy Based Diagnostics
Perform a Diagnostic System Check - Vehicle .
All diagnosis on a vehicle should follow a logical process. Strategy based
diagnostics is a uniform approach for
repairing all systems. The diagnostic flow may always be used in order to
resolve a
