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.
1989 Mitsubishi Precis BaseFACTORY OEM SERVICE PROCEDURE
Mixture Control Valve (Precis)
- Remove carburetor air cleaner. Bring engine to normal operating temperature. Open and close throttle valve quickly to check MCV operation and air suction noise. See Fig 1.
- MCV should open and suck air when throttle valve is quickly opened or closed. During idling condition, MCV valve should be closed with no sucking noise heard.
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.