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1975-77 BPV/EGR

  1. Remove air cleaner assembly and plug manifold vacuum fitting. Place air conditioner in "OFF" position (if equipped), block drive wheels. Place auto, trans, in Park (man. trans, in Neutral). Bring engine to normal operating temperature. Place cam follower on high step of fast idle cam.
  2. Check vacuum on source (control valve) side of BPV valve using vacuum gauge. Record reading. "T" a vacuum gauge to EGR control side of BPV valve. Vacuum reading observed should be 1.7 to 2.7 in. Hg. Replace BPV valve if not within specification.
  3. Remove and plug hose from EGR valve. Vacuum gauge reading should be same as recorded at source (control valve) side of BPV. If reading is not within 2 in. Hg of source vacuum, replace BPV valve. Remove vacuum gauge, install hoses and air cleaner assembly.
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