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Delay Valve

  1. Connect 39" (1 meter) long hose to vacuum signal side of EGR delay valve. Block opposite port with finger.
  2. With a hand-held vacuum pump, apply 25 in. Hg to delay valve. Remove finger. Vacuum should take about one second to bleed off. Reverse valve and repeat test. Vacuum should bleed off instantaneously. If there is no delay or valve delays in both directions, replace valve.
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