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Electronic EGR Valve (MERKUR & SCORPIO)

  1. Connect vacuum gauge to 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.
  2. Check vacuum lines for correct routing. Disconnect vacuum hose at EGR valve and connect vacuum gauge to hose. Accelerate engine to 2000-2500 RPM and release throttle. Repeat 8-10 times and check for consistent response.
  3. If vacuum increases above zero with cold engine, diaphragm is leaking and EGR control valve should be replaced. With engine warm, vacuum should increase to more than 15 in. Hg and return to zero when throttle is released.
  4. If system does not respond as indicated, or a Trouble Code 34 is present, test EGR control system. If testing is required, see SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE section.
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