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 MANUALSCHEVROLET1996LUMINA APV VAN PASSENGERREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEM - ADJUSTMENTSIGNITION TIMINGTDC OFFSET LEARN PROCEDURE
1996 Chevrolet Lumina APV Van Passenger
TDC Offset Learn Procedure
1996 Chevrolet Lumina APV Van PassengerSECTION TDC Offset Learn Procedure
NOTE:
It takes PCM 20 seconds to learn TDC offset.
This procedure is only used when one of following conditions exists:
- Front cover and PCM are removed and replaced at same time.
- Injection pump and PCM are removed and replaced at same time.
- Front cover and/or crank sensor, pump and PCM are removed and replaced at same time.
- Front cover has been removed.
- Engine has been replaced.
- Start and warm engine to normal operating temperature. Connect Tech 1 scan tool. Using scan tester, select OUTPUT TEST or INJECTION PUMP mode, and activate TDC OFFSET LEARN.NOTE: If engine stalls when "TDC TIME SET" is activated, turn engine off. Loosen injection pump nuts. Slightly rotate injection pump toward driver's side of vehicle. Tighten mounting nuts and repeat step 1).
- If learned TDC OFFSET reading is between .00 and -.50 degrees, procedure is complete. If reading is not as specified, slightly rotate injection pump and repeat step 1). A 1-mm pump movement equals about 2 degrees timing.
- To achieve a negative reading, rotate pump toward driver's side. To achieve a positive reading, rotate pump toward passenger's side.
- Start and warm engine to normal operating temperature. Connect Tech 1 scan tool. Using scan tester, select OUTPUT TEST or INJECTION PUMP mode, and activate TDC OFFSET LEARN.
RENDER: 1.0x
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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.