Engine idle speed test

The test measures individual cylinder speed when idling. It is used to determine engine running imbalance or other engine problems.

No special tools are required to perform the test, no engine component disassembly is performed. This is pure OBD-II diagnostics test.

Test prerequisites

  • Engine ON (running)
  • Engine idling (accelerator pedal not pressed)
  • Transmission must be in neutral
  • Engine warmed up to working temperature

Test procedure:

  • Run the test while engine is idling, the test automatically stops

Individual cylinder speed values are displayed (min-max during the test)

Coverage in SECONS diagnostic tools