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Home >> Mercedes Benz >> 1987 >> 560SL >> Repair and Diagnosis >> Engine Performance >> System >> BOSCH Cis-E System >> Component Testing >> Idle & Full Load Contact
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Idle & Full Load Contact

  1. Connect on-off ratio tester to diagnostic socket and turn on ignition. On-off ratio should be about 70%. Move airflow sensor plate about .80" (20 mm). On-off ratio should be about 10%. Go to step 2).
  2. If reading is 70%, throttle valve contact does not close or there's an interruption in wire to idle speed contact. Close airflow sensor plate. On-off ratio should be 40%. Go to step 3).
  3. Open throttle valve fully. On-off ratio should be 20%. If not okay, replace full load contact. If okay, test is complete.
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