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 Metro Base, 4D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE
Idle Speed & Ignition Timing
Ensure idle speed and base ignition timing are set to specification. If necessary, see ADJUSTMENTS article.
IGNITION TIMING SPECIFICATIONS (Degrees BTDC @ RPM)
| Application | Man. Trans. | Auto. Trans. | |||
|---|---|---|---|---|---|
| Metro LSi w/o ESC | |||||
| w/o Vacuum | 6-7 @ 750 | 6-7 @ 850 | |||
| w/ Vacuum | 12-13 @ 750 | 12-13 @ 850 | |||
| Metro w/ ESC | (1) 5 @ 750 | (1) 5 @ 850 | |||
|
|||||
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.