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Home >> Plymouth >> 1988 >> Grand Voyager LE >> Repair and Diagnosis >> Engine Performance >> System >> EGR Function Testing >> Vacuum Control >> Vacuum Amplifier
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Vacuum Amplifier

  1. Check for adequate manifold vacuum. With engine warm and at curb idle, connect vacuum gauge to hose on vacuum amplifier leading to carburetor venturi port. Attach a vacuum pump to hose and apply 2 in. Hg.
  2. Disconnect EGR delay timer hose (if equipped). EGR valve should open and engine speed should drop at least 150 RPM. If engine speed does not drop, replace vacuum amplifier.
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