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.
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HOMESERVICE MANUALSTOYOTA1990TERCEL BASE, 2D COUPE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROLS - ADJUSTMENTS - 4-CYL CARBURETEDIDLE SPEED & MIXTURE ADJUSTMENTIDLE MIXTUREPRELIMINARY PROCEDURE
1990 Toyota Tercel Base, 2D Coupe, Standard
Preliminary Procedure
1990 Toyota Tercel Base, 2D Coupe, StandardSECTION Preliminary Procedure
- Note if plug is located in front of the idle mixture adjusting screw. See Figure. If plug is used, plug must be drilled out to obtain access to idle mixture adjusting screw.
- It may be necessary to remove carburetor to gain access so plug can be removed. Center punch the plug and drill hole in plug so idle mixture adjusting screw can be adjusted.
- Using a .295" (7.49 mm) drill bit, drill out the plug. Use caution when drilling plug as not to drill into the idle mixture adjusting screw. Remove plug.
- Blow off all metal particles. Remove idle mixture adjusting screw and inspect for damage. Replace screw if damaged. Reinstall idle mixture adjusting screw. Turn idle mixture adjusting screw inward. DO NOT over tighten.
- Adjust idle mixture adjusting screw so head of the screw is .138" (3.50 mm) below surface of the carburetor.
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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.