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Double Throttle Diaphragm

  1. Disconnect vacuum relief solenoid valve tube from front of double throttle diaphragm. Apply vacuum of more than 7.8 in. Hg to the double throttle diaphragm.
  2. Make sure that the No. 2 secondary throttle valve is fully closed. Check the calibration of the double throttle diaphragm. It should start to open at 4.7 in. Hg and be fully open at 0-1.8 in. Hg. See Fig 1 .
  3. Disconnect vacuum hose from rear of double throttle diaphragm. Replace vacuum hose to front of double throttle diaphragm. Apply 18.1 in. Hg vacuum to rear of double throttle diaphragm. Check clearance between No. 2 secondary throttle valve and wall of throttle chamber. Clearance should be .08-.12" (2.2-3.2 mm).
Fig 1: Checking Double Throttle Diaphragm
G36898Courtesy of MAZDA MOTORS CORP.
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