Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1983 Chevrolet Sportvan G10, 5.7 LFACTORY OEM SERVICE PROCEDURE
Feedback Carburetor Tests W/Codes
- Diagnosis & Testing
- Recalling Trouble Codes
- Entering Diagnostic Mode
- Clearing Trouble Codes
- Exiting Diagnostic Mode
- Failure Code Determination
- Diagnostic Procedure
- ECM Trouble Code Id
- Driver Comment Checks
- Diagnostic Circuit Check
- System Performance Check
- Dwell Fixed Under 10°
- Dwell Fixed Between 10-50°
- Dwell Fixed Over 50°
- TPS Enrichment Check
- "Check Engine" Light Inoperative
- Won't Flash Code 12
- EDV Circuit Check
- Vacuum Sensor Output Check
- Canister Purge Valve Check - 5.0L & 5.7L Only
- Divert Valve Check
- TCC Electrical Diagnosis
- Est Performance Check
- Engine Cranks, But Won't Run (W/ Integral Coil)
- Code 12 - No Reference To ECM
- Code 13 - O2 Sensor CKT
- Code 14 - Shorted Cts Circuit
- Code 15 - Open Cts Circuit
- Code 21 - TPS Circuit
- Code 23 - M/C Solenoid Circuit
- Code 34 - Vacuum Sensor Circuit
- Code 41 - No Specific Reference
- Code 42 - Est/Est Bypass Circuit
- Code 44 - Lean O2 Sensor Failure
- Code 45 - Rich O2 Sensor Failure
- Code 51 - Faulty Prom
- Code 54 - M/C Or ECM Fault
- Code 55 - ECM Input CKTS
- Chart C1 - ECM Replacement Check Chart
- Electronic Control Module (ECM) R & I
- Prom R & I
- Oxygen Sensor R & I
- Vacuum Sensor R & I
- Coolant Temperature Sensor R & I
- Component Locations
- Wiring Diagrams
Factory Service Tools
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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.
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