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Home >> Suzuki >> 1990 >> Sidekick JS >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Overhaul - THM 400) >> Testing >> Control Pressure Results >> Line Pressure Too High
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Line Pressure Too High

WARNING: This page does not describe the selected car, but rather 124 other vehicles, including the 1991 Chevrolet Pickup, 1991 Chevrolet Cab & Chassis, 1988 GMC Vandura Special, 1988 GMC Vandura, and 1988 GMC Value Van. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vacuum system leak or improper engine vacuum. Water in vacuum modulator. Modulator valve not operating properly or defective. Defective EGR valve.
  2. Detent switch actuated or shorted, detent solenoid stuck open. Detent feed orifice in spacer plate blocked, detent solenoid loose. Detent valve bore plug damaged. Detent regulator valve pin too short.
  3. Pump pressure regulator and/or boost valve stuck. Incorrect pump pressure regulator spring. Pressure boost valve installed backward. Too many pressure regulator valve spacers. Pump casting defective. Aluminum bore plug has hole or not working. Pressure boost bushing broken or not working.
  4. Control valve assembly-to-spacer gasket out of proportion, control valve assembly gaskets switched.
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