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.
1991 Geo Tracker LSi, AutomaticFACTORY OEM SERVICE PROCEDURE
Ignition Timing
- Start and warm engine to normal operating temperature. Turn engine off and leave ignition on for 5 seconds, then state engine again. Turn engine and all accessories off. Attach timing light to No. 1 spark plug wire.
- 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.
- Start engine and check timing mark alignment on crankshaft pulley with timing marks on timing belt cover. Ignition timing and idle speed must be within specification. See IGNITION TIMING SPECIFICATIONS table.IGNITION TIMING SPECIFICATIONS (Degrees BTDC@RPM) (1)
Application Man. Trans. Auto. Trans. Tracker (2) 8@800 (2) 8@800 (1) If specification differs from emission label, use specification listed on emission label. (2) 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. - If ignition timing is not within specification, loosen distributor hold-down flange bolt and rotate distributor to obtain correct ignition timing. Tighten distributor hold-down flange bolt to 11 ft. lbs. (15 N.m). Recheck ignition timing.
- Turn engine off. Remove jumper wire and install cap on diagnostic connector. Remove timing light.
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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