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.

1993 Toyota Tercel BaseFACTORY OEM SERVICE PROCEDURE

Dashpot Control System

Warm engine to normal operating temperature. Ensure idle speed is correct. See IDLE SPEED & MIXTURE in ADJUSTMENTS article. Remove cap, filter and separator from dashpot. See Fig 1.
Start engine. Maintain engine speed at specified testing RPM. See DASHPOT TESTING SPECIFICATIONS table. Plug Vacuum Transmitting Valve (VTV) hole with your finger. See Fig 2.
Release throttle. Dashpot should be extended and dashpot setting RPM should be as specified. See DASHPOT TESTING SPECIFICATIONS table.
If dashpot setting RPM is incorrect, rotate dashpot adjusting screw to obtain correct RPM. See Fig 3. Repeat steps 3) and 4) and ensure proper adjustment is obtained.
Install separator, filter and cap. Install filter with the coarse surface facing outward (away from dashpot).
To check VTV operation, operate engine at dashpot testing RPM for a few seconds. Release throttle. Ensure engine returns to idle in a few seconds.

Fig 1: Identifying Dashpot

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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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.

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