Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Geo Tracker Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Vacuum Advance
- Remove vacuum hose from vacuum advance outer diaphragm connector and attach hand-held vacuum pump. Apply 15 in. Hg of vacuum while observing base plate.
- Base plate should move smoothly and vacuum pump indicator gauge should remain constant. Check inner diaphragm unit in same manner. If vacuum advance performance is incorrect, check vacuum advance unit and distributor plate for sticking or worn linkage. Replace as necessary.
PICK-UP COIL AIR GAP (1)
| Application | Clearance In. (mm) | ||
|---|---|---|---|
| All Models | .008-.016 (.20-.41) | ||
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Factory Service Tools
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When to See a Mechanic
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.