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Home >> Cadillac >> 1992 >> Seville Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - System/Component Tests) >> Ignition System >> Timing Control Systems >> Electronic Spark Timing (EST) Advance System
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Electronic Spark Timing (EST) Advance System

WARNING: This page is about a different car, the 1992 Oldsmobile Toronado, 1992 Cadillac Eldorado, and 1992 Buick Riviera. However, it is still accessible from the selected car via links, so may be relevant.
  1. A malfunction in the EST circuit should set a related trouble code. Start engine and warm to operating temperature. On vehicles equipped with a manual transmission, increase engine speed to about 2000 RPM. On vehicle equipped with an automatic transmission, slightly increase idle speed.
  2. On all vehicles, ground "test" terminal "B" of ALDL. A noticeable change in engine speed should occur. If no change occurs, see DIAGNOSTIC CIRCUIT CHECK in BASIC TESTING article in this section.
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