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Idle Speed

  1. Place transaxle in Park (A/T) or Neutral (M/T) and apply parking brake. Ensure throttle cable has at least .4-.6" (10.-15. mm) of slack in cable. Adjust throttle cable slack (if necessary).
  2. Ensure all emission hoses, electrical connections and air cleaner are properly installed. Ensure ignition timing is within specification. See IGNITION TIMING  . Ensure all accessories are off. Remove cover from idle speed adjusting screw.
  3. Start engine and warm to normal operating temperature. Accelerate engine so engine speed exceeds 1500 RPM, then allow to idle. Connect scan tester to duty check Data Link Connector (DLC). Connect a jumper wire between duty check DLC terminal "B" (Blue/Yellow wire), located near fusible link box by the battery, and ground. See Figure . Idle speed should be within specification. Refer to the IDLE SPEED SPECIFICATIONS  table.
  4. If idle speed requires adjustment, turn idle speed adjusting screw inward to increase idle speed or outward to decrease idle speed. See Fig 1 .
  5. On A/C-equipped models, turn A/C to low speed. With A/C operating, idle speed should be within specification. See A/C IDLE SPEED SPECIFICATIONS  table.
  6. If idle speed requires adjustment, turn idle speed adjusting screw to obtain correct idle speed. See Fig 1 .
  7. Turn engine off. Remove jumper wire from duty check DLC. Install idle speed adjusting screw cover (if removed), and remove scan tester.
Fig 1: Adjusting Idle Speed
G91B16791Courtesy of GENERAL MOTORS CORP.
IDLE SPEED SPECIFICATIONS(1)

Application Idle RPM
Tracker (2)(3) 750-850
(1) If specification differs from emission label, use specification listed on emission label.
(2) With transaxle/transmission in Neutral (M/T) or Park (A/T).
(3) Idle speed checked with diagnostic connector grounded.
A/C IDLE SPEED SPECIFICATIONS

Application (1) Engine RPM
A/T (2)
M/T 950-1050
(1) Transaxle/transmission in Neutral (M/T) or in Park (A/T).
(2) Idle speed should be 950-1050 RPM in Neutral or Park, and 750-850 RPM in Drive, Reverse or any other forward gear.
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