1993 GMC Forward Control 5.7 K, _NA_, CNGFACTORY OEM SERVICE PROCEDURE

Intake Manifold Tuning Valve Assembly: Removal

Disconnect electrical connector. Remove tuning valve attaching screws, tuning valve and O-ring seal.

NOTE: The tuning valve is an electrical component. DO NOTΒ  soak it in any liquid cleaner or solvent, damage may result. To avoid breaking tuning valve mounting ears, alternately tighten attaching screws until they engage mounting ear surface, then tighten each screw to specified torque.
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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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