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Home >> Cadillac >> 1988 >> Cimarron Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Multi-Port >> Adjustments >> Minimum Idle Speed >> 2.3L
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Minimum Idle Speed: 2.3L

  1. Apply parking brakes. Install "Scan" tool. Start engine and operate to normal operating temperature. Ensure engine enters closed loop. On A/T applications, shift into Drive then back to Neutral.
  2. Ensure all accessories are off. Ensure no input is being received from power steering switch. See appropriate POWER STEERING PRESSURE SWITCH CHART C-1E in COMPUTERIZED ENGINE CONTROL section. Allow idle to stabilize.
  3. Using "Scan" tool, note "COUNT" reading. Adjustment is correct if "COUNT" reading ranges between 5 and 45. If "COUNT" is low, check for vacuum leaks.
  4. If "COUNT" exceeds specified range, remove inlet duct at throttle body and clean contamination from inside of throttle body. If "COUNT" reading still is not within specified range, throttle stop screw requires adjustment.
  5. Using awl, pierce throttle stop screw plug and remove. Back stop screw outward until air gap exists between stop screw and throttle lever. Turn stop screw inward until it just contacts throttle lever.
  6. Turn stop screw inward an additional 1 1/2 turns. Recheck "COUNT" reading. Rotate stop screw to increase throttle plate opening to lower "COUNT" reading or decrease opening to increase "COUNT" reading. Adjust TPS once reading is correct. See THROTTLE POSITION SENSOR under ADJUSTMENTS  in this article.
NOTE: Following procedures does not apply to 3.8L "3800" (VIN C). No information was available.
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