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.
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HOMESERVICE MANUALSCHEVROLET1986CHEVY VAN G20, 5.0 H, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISFEEDBACK CARBURETOR TESTS W/CODESDIAGNOSIS & TESTINGCODE 44: LEAN EXHAUST INDICATION
1986 Chevrolet Chevy Van G20, 5.0 H, Standard
Code 44: Lean Exhaust Indication
1986 Chevrolet Chevy Van G20, 5.0 H, StandardSECTION Code 44: Lean Exhaust Indication
Code 44 indicates that the ECM has seen oxygen sensor voltage under the following conditions:
- Voltage lower than specified.
- Closed Loop.
- Above a specified TPS value.
- For a time longer than specified.
- A fixed dwell of under 10° indicates the problem is still present. A fixed dwell under 10° at idle, with dwell varying at 3000 RPM, usually indicates an intake leak. Check this area prior to replacing oxygen sensor.
- This test checks if the ECM is able to respond to a rich condition caused by choking the engine. If it does, the problem is a lean engine condition, NOT ELECTRICAL.
- If dwell increases to over 50° with heavy choking, the fault is an air leak. If air is going to exhaust ports, disconnect the solenoid(s) for the air control valve. If air still goes to the ports, air valve is faulty.
- This step puts a rich oxygen sensor signal of about one volt, into terminal "9" of the ECM. Dwell should increase (lean command).
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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.