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Modulator Valve

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  1. Disconnect all vacuum and exhaust pipe hoses from modulator valve. Cap fittings going to each EGR control solenoid. Blow into bottom fitting from exhaust pipe end.
  2. Apply 7 in. Hg to fitting No. 3 (from ported vacuum source). Vacuum should hold until pressure at bottom fitting is released. If further testing is required, see SYSTEM & COMPONENT TESTING article in ENGINE PERFORMANCE section.
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