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Throttle Diaphragm

WARNING: This page is about a different car, the 1989 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.
  1. On M/T models, disconnect hose at throttle diaphragm. Using vacuum pump, apply at least 7.8 in. Hg to throttle diaphragm. See Fig 1 .
  2. Ensure that No. 2 secondary throttle valve is fully open. On A/T models, disconnect hose from double throttle diaphragm. Using vacuum pump, apply 18.1 in. Hg to No. 2 secondary double throttle diaphragm. See Fig 1 .
  3. With vacuum applied, check clearance between No. 2 secondary throttle valve and throttle bore wall when primary throttle valve is closed. Clearance should be .09-.13" (2.3-3.3 mm).
Fig 1: Checking Throttle Diaphragm
G93908Courtesy of MAZDA MOTORS CORP.
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