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Home >> Mazda >> 2005 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> Emissions >> EGR Function Testing - MAZDA >> EGR Function Testing - MAZDA >> Test 1 >> Piston Engines (W/Single Or Dual EGR Valves)
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Piston Engines (W/Single Or Dual EGR Valves)

  1. Check vacuum lines for correct routing. Disconnect vacuum hose at EGR valve, and plug hose end. Connect vacuum pump to valve. Start engine. Apply 6-10 in. Hg to EGR valve and hold.
  2. Engine speed should drop at least 100 RPM or engine should stall. Vacuum should not drop greater than one in. Hg in 30 seconds. Reconnect EGR vacuum hose.
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