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HOMESERVICE MANUALSCHEVROLET1983SPORTVAN G10, 5.7 LREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400TESTINGVACUUM REGULATOR VALVE (DIESEL MODELS ONLY)
1983 Chevrolet Sportvan G10, 5.7 L

Vacuum Regulator Valve (Diesel Models Only)

1983 Chevrolet Sportvan G10, 5.7 LSECTION Vacuum Regulator Valve (Diesel Models Only)
  1. Attach vacuum regulator valve to fuel injection pump. Valve body must be securely attached but free to rotate on pump. Attach vacuum source of 9.0-10.4 psi (.6-.7 kg/cm2 ) to bottom vacuum nipple. Attach vacuum gauge to upper nipple.
  2. Insert vacuum regulator gauge bar between gauge boss on injection pump and wide open stop screw on throttle lever. Rotate throttle shaft and hold lever against gauge bar. Slowly rotate vacuum regulator valve body clockwise.
  3. Setting will only be valid if performed with clockwise rotation. When vacuum gauge reads 5.3-5.9 psi (.37-.41 kg/cm2 ), tighten valve body mounting screws. Check setting by releasing throttle lever to idle stop position.
  4. Rotate throttle shaft back until lever rests against gauge bar again. Check vacuum gauge reading and ensure it is still 5.3-5.9 psi (.37-.41 kg/cm2 ). If not to specification, reset valve and check setting again.
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.