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 MANUALSCHEVROLET1989CAPRICE BASE, 4.3 Z, 700R4/MD8REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISCCC V8 CARBURETOR TESTS W/CODESSELF-DIAGNOSTICSCODE 44 - LEAN EXHAUST INDICATION
1989 Chevrolet Caprice Base, 4.3 Z, 700R4/MD8
Code 44 - Lean Exhaust Indication
1989 Chevrolet Caprice Base, 4.3 Z, 700R4/MD8SECTION Code 44 - Lean Exhaust Indication
NOTE:
Test numbers refer to test numbers on diagnostic chart.
- System will return to "open loop" if O2 sensor cools off while engine is idling. Scan "loop" status often during testing. For intermittent condition, see INTERMITTENTS in the CCC TESTS W/O CODES article in this section.
- Checks if ECM is able to respond to a rich condition caused by choking the engine. If ECM responds, problem is a lean engine condition, NOT ELECTRICAL.
- This step puts a rich O2 signal (about one volt) into terminal No. 9 of ECM. Dwell should increase (lean command).
- If dwell increases to greater than 50 degrees with heavy choking, fault is an air leak, since ECM was able to respond. If air is going to exhaust ports, disconnect solenoid(s) for the air control valve. If air still goes to ports, valve is faulty. Repair exhaust leaks as necessary. If no exhaust leaks are found, service carburetor.
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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.