1993 Chevrolet Cavalier Z24, 2D Convertible, StandardFACTORY OEM SERVICE PROCEDURE

Line Pressure Too High

  1. With pressure high in "N" and "D" positions, and normal to high in "2" and "R" positions, check for broken, sticking or misadjusted Throttle Valve (T.V.) cable.
  2. Inspect T.V. linkage for binding or incorrect cable. Check throttle valve or shift T.V. valve for sticking. Inspect T.V. lifter for bend or damage. Check if lifter length is too short.
  3. Inspect components of control valve and pump assembly for sticking or damaged T.V. valve and plunger, shift T.V. valve, pressure regulator valve, T.V. boost valve and/or pump slide.
  4. Check for worn or missing pressure regulator valve retaining pin. If line pressure is too high in "1" position only, check low blow-off valve for sticking. Inspect internal pump case or case cover for leaks.
Factory Service Tools

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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.

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