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.
Idle Speed Control System
An electrically governed idle rpm control valve keeps the idle speed stable under the various engine operating conditions. Measured intake air from the air flow meter by-passes the throttle plate through the idle rpm control valve and subsequently calls for additional fuel injection. The amount of by-pass air is determined by the variable orifice of the control valve.
An additional electronic control unit, the "Idle Speed CU", controls the orifice opening according to the engine speed and the engine operating conditions as related to engine coolant temperature, transmission, air conditioning, and heater intake air temperature.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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