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Vacuum Switch: Pickup

  1. Connect a vacuum gauge to vacuum fitting on intake manifold. Start engine. With engine running at idle and low manifold vacuum, vacuum switch is on and voltage is sent to anti-dieseling solenoid valve.
  2. With engine speed at 2500-3000 RPM and manifold vacuum above 24 in. Hg, vacuum switch is off thus deactivating anti-dieseling solenoid valve. If vacuum switch does not operate as described, replace it.
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