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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (AUTOMATIC TRANSAXLE OVERHAUL & TESTING - 4T65-E)COMPONENT DISASSEMBLY & REASSEMBLYCONTROL VALVE BODYCLEANING
1999 GMC Forward Control 5.7 R, Automatic

Control Valve Body: Cleaning

1999 GMC Forward Control 5.7 R, AutomaticSECTION Cleaning
WARNING: This page does not describe the selected car, but rather 43 other vehicles, including the 2003 Pontiac Montana, 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Pontiac Aztek, and 2003 Oldsmobile Silhouette. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: DO NOT use solvent to clean solenoid valves or neoprene seals. DO NOT use shop rags to clean valve body components. Handle parts carefully to avoid nicks and scratches.

Clean control valve body thoroughly in clean solvent. Move valves with a pick or small screwdriver to dislodge any dirt or debris. Use air nozzle to dry control valve body and to blow out all passages. Gently probe small passages with a piece of identification tag wire or equivalent.

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.