Contents: Examination ⇊ Replacement ⇊
The FIT valve is installed on some vehicle models and is used to increase idle speed by introducing additional air into the intake manifold during engine warm-up.
Examination
1. When starting the test, the engine must be cold. Disconnect the air supply hose from the throttle body (see Chapter Power and exhaust systems).
2. Run the engine at idle speed. Insert your finger into the throttle body and press it against the nipple connected to the FIT valve (see accompanying illustration). A vacuum should be felt.
3. Warm up the engine to normal operating temperature and repeat the check. This time there should be no vacuum. The presence of voltage means that the valve is not closing completely, which may be caused by a low coolant level or air pockets in the cooling system tract - check and make the necessary adjustments.
4. If the fluid level is normal and air has been completely bled from the system, replace the FIT valve.
Replacement
Attention! Before starting the procedure, wait until the engine has completely cooled down.
1. Disconnect the hose from the valve, then unscrew the mounting bolts (see illustration above). remove the valve together with the sealing rings. Immediately plug the open end of the hose to minimize coolant loss.
2. Install the valve in its original place (don't forget to replace the o-rings), screw in the mounting bolts and tighten them to the required torque. Replace the hose clamp if necessary.
8 Check the coolant level and adjust if necessary (see Chapter Routine maintenance).