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Home >> GMC >> 1985 >> Value Van P2500, 5.7 M, Automatic, 400/M40 >> Repair and Diagnosis >> Engine Performance >> Adjustment >> Tune-Up - Diesel >> Testing >> Engine Compression >> 2.2L
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Engine Compression: 2.2L

  1. Start engine and bring coolant temperature to 176°F (80°C). Remove sensing resistor, glow plug connector and fuel cut solenoid connector. Disconnect fusible link wire of glow plug system. Remove all glow plugs.
  2. Install adapter (J-26999-20) and compression gauge. Turn starter motor and read compression for individual cylinders.
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