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HOMESERVICE MANUALSGEO1991TRACKER LSI, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTSIDLE SPEED & MIXTURENOTES
1991 Geo Tracker LSi, Automatic

Idle Speed & Mixture: Notes

1991 Geo Tracker LSi, AutomaticSECTION Notes
  1. Ensure air cleaner and all electrical connections and emission hoses are properly installed. Ensure throttle cable is not binding.
  2. Set parking brake. Install tachometer. Start and warm engine to normal operating temperature. Ensure all accessories are off. Accelerate engine so engine speed exceeds 1500 RPM and then allow to idle.
  3. Remove cap from diagnostic connector, located in engine compartment, near fusible link box by the battery. Connect a jumper wire between terminals "C" (Black wire) and "D" (Blue/Red wire) of diagnostic connector.
  4. Note idle speed. Idle speed should be within specification. See IDLE SPEED SPECIFICATIONS table. If idle speed requires adjustment, remove plug and rotate idle speed adjusting screw on throttle body to obtain correct idle speed. See Fig 1 .
    Fig 1: Adjusting Idle Speed
    G91B16791Courtesy of GENERAL MOTORS CORP.
  5. On A/C equipped models, turn A/C on. With A/C operating, idle speed should be within specification. See A/C IDLE SPEED SPECIFICATIONS table.
  6. On all models, turn engine off and remove tachometer. Remove jumper wire from diagnostic connector and install cap.
IDLE SPEED SPECIFICATIONS (1)

Application Idle RPM
Tracker (2)(3) 800
(1) If specification differs from emission label, use specification listed on emission label.
(2) Specification listed are with transmission in Neutral on M/T models or in Park on A/T models
(3) Specification listed with jumper wire installed between terminals "C" Black wire) and "D" (Blue/Red wire) of diagnostic connector, located near fusible link box by the battery.
A/C IDLE SPEED SPECIFICATIONS

Application (1) Engine RPM
Tracker
A/T (2)
M/T 950-1050
(1) Specification listed are with transmission in Neutral on M/T models or in Park on A/T models.
(2) Idle speed should be 950-1050 RPM in Neutral or Park and 750-850 RPM in gear.
RENDER: 1.0x

NO RELATED

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.