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Basic Idle Speed (1.8L)

WARNING: This page is about a different car, the 1994 Plymouth Laser and 1994 Eagle Talon. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ensure vehicle is at operating temperature, all accessories are off, and transmission is in Park or Neutral. Front wheels must be in straight-ahead position.
  2. Insert paper clip in CRC (Tach) filter connector, and connect tachometer to inserted clip. See Figure . Without starting engine, turn ignition on. Leave ignition on for 15 seconds to completely close Idle Speed Control (ISC) plunger. Turn ignition off. Disconnect ISC servomotor connector. See Fig 1 .
  3. Turn fixed Speed Adjusting Screw (SAS) until throttle valve is fully closed. See Fig 2 . Start engine, and let it idle. Check basic idle speed. See IDLE SPEED SPECIFICATIONS  table. If basic idle speed is within specification, go to next step. If basic idle speed is not within specification, adjust by turning Idle Speed Control (ISC) adjusting screw. See Fig 2 . Go to next step.
    Fig 1: ISC Servomotor Connector ID (1.8L)
    G92I03955Courtesy of CHRYSLER CORP.
    Fig 2: Speed Adjusting Screw ID (1.8L)
    G93I39519Courtesy of CHRYSLER CORP.
  4. Turn fixed SAS clockwise until idle speed starts to increase. See Fig 2 . Turn fixed SAS counterclockwise until idle speed no longer drops (touch point).
  5. Turn fixed SAS counterclockwise an additional 1/2 turn from touch point. Turn engine off. Check TPS voltage using Digital Volt-Ohm-meter (DVOM), and adjust TPS if necessary. See THROTTLE POSITION SENSOR (TPS)  . Disconnect DVOM after checking TPS voltage.
  6. Adjust accelerator cable free play (if necessary). Connect ISC servomotor connector. Start engine. Ensure engine is running at curb idle speed. See IDLE SPEED SPECIFICATIONS  table.
  7. If curb idle speed is not within specification, diagnose ISC system. See appropriate TESTS W/CODES - 1.8L article and/or the TESTS W/CODES - 2.0L/2.0L TURBO article in the ENGINE PERFORMANCE section. Turn engine off. Remove all test equipment. Disconnect negative battery cable for 10 seconds to clear any trouble codes.
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