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Home >> Plymouth >> 1978 >> Sapporo 2.6L Eng VIN F, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Ignition Timing Control System >> Testing >> THERMO Valve >> 1976 Models
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1976 Models

  1. Remove thermo valve from intake manifold and allow it cool to room temperature. See Fig 1. Check valve by blowing into vacuum fitting. Valve is working properly if EGR fitting allows air to pass freely and distributor fitting is blocked.
  2. Immerse thermo valve in water heated to 140°F (60°C), for at least one minute. Valve is working properly if no air flows through either fitting. Remove thermo valve and continue heating water until it boils.
  3. Immerse thermo valve in water for at least one minute. Valve is working properly if distributor fitting allows air to pass freely and EGR fitting is blocked. Replace thermo valve if it fails any test.
    NOTE: For test purposes, thermo valve fittings are numbered 1 through 4, with port No. 1 at bottom and port No. 4 at top.
    Fig 1: 1976 Ignition Timing Control System
    G09313045Courtesy of CHRYSLER GROUP, LLC
    Fig 2: 1977-78 Ignition Timing Control System
    G09313046Courtesy of CHRYSLER GROUP, LLC
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