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Home >> Geo >> 1992 >> Metro Base, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Controls - Adjustments >> Idle Speed & Mixture >> Idle Speed

Idle Speed

  1. Place transaxle in Park (A/T) or Neutral (M/T) and apply parking brake. Ensure throttle cable has at least .12-.20" (3.1-5.1 mm) of slack in cable. Adjust throttle cable slack (if necessary).
  2. Ensure all emission hoses and air cleaner are properly installed. Install tachometer. Ensure all accessories are off. Start engine and warm to normal operating temperature.
  3. Install spare fuse in DIAG SW (diagnostic switch) terminal in fuse block. See Fig 1 . Idle speed should be within specification. See IDLE SPEED SPECIFICATIONS  .
  4. If idle speed requires adjustment, remove cover from idle speed adjusting screw. 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 the A/C operating, idle speed should be within specification. Refer to the A/C IDLE SPEED SPECIFICATIONS  .
  6. If idle speed requires adjustment, rotate adjustment screw on air conditioner Vacuum Switching Valve (VSV) to obtain correct idle speed. See Fig 1 . A/C VSV is mounted on firewall, right of ignition coil.
  7. On all models, turn engine off. Remove spare fuse from DIAG SW (diagnostic switch) terminal in fuse block. Install idle speed adjusting screw cap (if removed) and remove tachometer.
Fig 1: Adjusting Idle Speed
G121580Courtesy of GENERAL MOTORS CORP.
IDLE SPEED SPECIFICATIONS (1)

Application Idle RPM
Metro Convertible (2)(3) 800-900
Metro & Metro LSi
A/T (2)(3) 800-900
M/T (2)(3) 750-850
Metro XFi (M/T) (2)(3) 650-750
(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) With spare fuse installed in DIAG SW connector in fuse block.
A/C IDLE SPEED SPECIFICATIONS

Application (1) Engine RPM
Metro Models (2)
Early Production (3)
Metro & LSi
A/T 800-900
M/T 750-850
Metro Convertible 800-900
Metro XFi 650-750
Late Production (3)
Metro (All Models) 850-950
(1) Transaxle/transmission in Neutral (M/T) or in Park (A/T).
(2) Vacuum Switching Valve (VSV) is used for maintaining idle speed during A/C operation.
(3) If ECM part number ends with a "0", use early production specification. If ECM part number ends with other than "0", use late production specification.
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