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, 5.7 M, AUTOMATIC, 475/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - 6.2L V8 DIESEL VIN [J]FUEL SYSTEMINJECTOR TIMING
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 475/M40
Injector Timing
1983 Chevrolet Step Van P20, 5.7 M, Automatic, 475/M40SECTION Injector Timing
- Check alignment of injection pump marks. If marks are not within tolerance shown in Fig. Fig 1, timing is necessary. Loosen 3 retaining nuts and turn pump with 3/4" (19 mm) wrench (J-29872) on boss at front of pump.
- Tighten nuts and adjust throttle linkage. Disconnect cruise control and transmission linkage. Disconnect pump rod, loosen lock nut, and shorten rod several turns.
- Rotate throttle lever to full-throttle position and lengthen rod until it fits with lever just contacting full-throttle stop. Reconnect linkage from cruise control or transmission.
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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.