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Home >> Audi >> 1994 >> 90 CS, 2.8 K, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic System >> Engine Basic Setting (ECM "B") >> Preliminary Information For Display Groups 13 & 14

Preliminary Information For Display Groups 13 & 14

  1. Knock regulation is active at engine loads of 40 percent or greater. At lesser engine loads, current or last ignition timing point retarding values are displayed. If knocking can be heard but ignition timing does not retard, increase engine speed to 3500 RPM for 5 seconds to initiate knock sensor fault recognition (diagnosis).
  2. If ignition timing point retard value of one cylinder clearly deviates from the other cylinders, check for loose components, corroded knock sensor connector or oil combustion due to piston damage. If ignition timing point retard values for one bank of cylinders is greater than values for other bank, check for corroded knock sensor connector. See DISPLAY GROUPS 15 and/or 16.
  3. Ensure knock sensor is tightened to 15 ft. lbs. (20 N.m). Check for faulty wiring, faulty knock sensor or loose components. If ignition timing point retard value is high for all cylinders (both banks), fuel octane is too low.
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