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 MANUALSCHEVROLET1983STEP VAN P20, 6.2 J, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - 4.1L 6-CYL VIN [D]IGNITION SYSTEMIGNITION TIMING
1983 Chevrolet Step Van P20, 6.2 J, Automatic, 400/M40
Ignition Timing
1983 Chevrolet Step Van P20, 6.2 J, Automatic, 400/M40SECTION Ignition Timing
NOTE:
Engines are equipped with a receptacle for magnetic probe timing equipment, located 10° ATDC. DO NOT
use this location for timing with a conventional light.
- Install timing light with an adapter between No. 1 spark plug and No. 1 spark plug wire, or use an inductive type pickup. DO NOT puncture wire.
- Ignition timing is set with the engine at normal operating temperature, choke full open, air cleaner installed and air conditioner off.
- On Federal emission vehicles (HEI equipped), disconnect and plug vacuum hose at distributor. Set ignition timing at specified engine speed. Unplug and reconnect the vacuum hose.
- On California emission vehicles (HEI-EST equipped), disconnect 4 wire connector at distributor and set ignition timing at specified engine speed. Reconnect 4 wire connector and clear ECM trouble code.
IGNITION TIMING
| Application | Man. Trans. | Auto Trans. | ||||
|---|---|---|---|---|---|---|
| Federal | (1) 10 | (1) 10 | ||||
| Calif. | 6 @ 700 | (2) 6 @ 650 | ||||
|
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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.