1990 Mazda 929 BaseFACTORY OEM SERVICE PROCEDURE

Vacuum Signal

Disconnect vacuum hose from swirl control valve actuator. See Fig 1 . Place finger over hose and verify vacuum is felt at idle. Gradually increase engine speed and verify no vacuum is felt at greater than 4000 RPM. Reconnect vacuum hose to actuator.

Fig 1: Identifying TICS Actuator Components
G117756Courtesy of MAZDA MOTORS CORP.
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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