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1978-79 Fox

  1. Install "T" fitting between vacuum amplifier and throttle valve port. Connect open side of "T" fitting to vacuum gauge. Run engine at idle. Vacuum gauge should read 2-4 in. Hg. If not, replace vacuum amplifier.
  2. Next, install "T" fitting in hose between amplifier and throttle valve housing. Connect open side of "T" to vacuum gauge. Run engine at idle and read vacuum gauge. Gauge should read 0.2 - 0.3 in. Hg. If not, check throttle valve port for obstructions.
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