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Cylinder Compression Test

WARNING: This page is about a different car, the 2017 RAM ProMaster 3500, 2017 RAM ProMaster 2500, and 2017 RAM ProMaster 1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Warm up engine to operating temperature (approximately 80 °C, 176 °F).
  2. Shut the engine off.
  3. Disable the low pressure fuel pump.
  4. Remove the fuel injector. Refer to REMOVAL .
  5. Crank engine several times with the starter to eliminate combustion residues in the cylinders.
    GC0162035Courtesy of CHRYSLER GROUP, LLC
  6. Insert the (special tool #2000035700, Adapter, Compression Test) (1) into fuel injector hole of cylinder to be tested. Install fuel injector clamp (3), bolt (2) and securely tighten.
  7. Test compression pressure by cranking engine with starter for at least 8 revolutions.
  8. Carry out test procedure at the remaining cylinders in the same way and record your value for each cylinder.
  9. Look for a maximum difference of 10% between the highest reading to lowest reading.
  10. Remove the (special tool #2000035700, Adapter, Compression Test) from cylinder head.
  11. Install the fuel injector. Refer to INSTALLATION .
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