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 MANUALSCHEVROLET1989STEP VAN P30, 4.8 T, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC TBI TESTS W/CODESDIAGNOSTIC CHARTSCODE 44 - LEAN EXHAUST INDICATIONTEST DESCRIPTION
1989 Chevrolet Step Van P30, 4.8 T, Standard
Test Description
1989 Chevrolet Step Van P30, 4.8 T, StandardSECTION Test Description
NOTE:
Test numbers refer to test numbers on diagnostic chart.
Code 44 is set when the O2 sensor signal on circuit No. 412 remains below .2 volt for 20 seconds, and the system is operating in "Closed Loop".
RENDER: 1.0x
NO RELATED
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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.