Section 60 (Engine Controls - Tests W/Codes - 5.7L (G Series)): Introduction
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Most engine control problems are the result of mechanical breakdowns, poor electrical connections or damaged vacuum hoses. Before considering the computer system as a possible cause of problems, perform checks and inspections covered in the F - BASIC TESTING - 5.7L article. Failure to do so may result in lost diagnostic time.
If no faults found performing procedures in the BASIC TESTING - 5.7L article, proceed with DIAGNOSTIC PROCEDURE under SELF-DIAGNOSTIC SYSTEM. If no fault codes are present and driveability problems exist, proceed to the TESTS W/O CODES article for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.). If only intermittent codes are present, see INTERMITTENTS in the TESTS W/O CODES article.