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Home >> Plymouth >> 1988 >> Voyager Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> EGR Function Testing >> Vacuum Control >> Vacuum Amplifier

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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