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Ported EGR Valve

  1. Check vacuum lines for correct routing. Disconnect vacuum hose at EGR valve and plug hose. Disconnect idle air by-pass valve (EFI only).
  2. Connect vacuum pump to EGR valve. Start engine. Apply 6-10 in. Hg to valve and hold. Engine speed should drop at least 100 RPM or stall. Vacuum should not drop more than 1 in. Hg in 30 seconds.
  3. Reconnect idle air by-pass valve (EFI only). Reconnect EGR vacuum hose. If system does not respond as indicated, test EGR control system. If testing is required, see appropriate COMPONENT TESTING article in the EMISSION section.
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