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HOMESERVICE MANUALSCHEVROLET1985CHEVY VAN G20, 6.2 C, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 13 (ENGINE CONTROLS - TESTS W/CODES - 4.3L)INTRODUCTIONNOTES
1985 Chevrolet Chevy Van G20, 6.2 C, Standard

Section 13 (Engine Controls - Tests W/Codes - 4.3L): Introduction: Notes

1985 Chevrolet Chevy Van G20, 6.2 C, StandardSECTION Notes
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 1994 Oldsmobile Bravada, 1994 GMC Vandura, 1994 GMC Sonoma, 1994 GMC Safari, and 1994 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.

Most engine control problems result from mechanical failures, poor electrical connections or damaged vacuum hoses. Before condemning the computer system, perform checks and inspections covered in appropriate F - GASOLINE BASIC TESTING article in this section. See list below. Failure to do so may result in lost diagnostic time.

  • F - BASIC TESTING (for Astro & Safari)
  • F - BASIC TESTING (for "S" & "T" Series)
  • F - BASIC TESTING - GASOLINE (for "C" & "K" Series)
  • F - BASIC TESTING - GASOLINE (For "G" & "P" Series)

If no faults were found while performing BASIC TESTING PROCEDURES, proceed with DIAGNOSTIC PROCEDURE. If no fault codes or only a non-running Code 12 is present and driveability problems exist, proceed to appropriate TESTS W/O CODES article in this section for diagnosis by symptom (i.e., ROUGH IDLE, NO START, etc.). If only intermittent codes are present, see INTERMITTENTS in appropriate TESTS W/O CODES article in this section. See list below.

  • H - TESTS W/O CODES (for Astro & Safari)
  • H - TESTS W/O CODES (for "S" & "T" Series)
  • H - TESTS W/O CODES - GASOLINE (for "C" & "K" Series)
  • H - TESTS W/O CODES - GASOLINE (For "G" & "P" Series)
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.