Erratic idling when the engine warms up.
Dips in gas supply
Power drop, top speed not reached.
Checking the air damper actuator
Remove air filter.
Remove the fresh air hose from the air filter housing.
Check the tightness of the fastening of the vacuum hoses from the vacuum diaphragm device to the thermal vacuum valve and from the valve to the carburetor.
Check hoses for damage by bending them and replace if necessary.
Disconnect the hose with the brown fitting from the thermal vacuum valve at the bottom of the air filter housing and check the operation of the air damper by sucking in air with your mouth. You should hear the damper close or open.
If the damper remains closed, replace the diaphragm vacuum device.
Checking the thermal vacuum valve
Inspection conditions The suction pipe must be in order and the engine must be cold, not more than hand temperature. The air intake must not exceed 20°C.
Connect both vacuum hoses to the thermal vacuum valve. Connection for a vacuum hose from a vacuum device (brown connection element) can be identified as follows brown sticker next to the fitting, brass fitting on the valve, the fitting has a notch. Connect the black vacuum hose to the connection on the carburetor, if necessary, extend the hose with an intermediate link.
The air filter remains removed. Start the engine and let it idle. The control valve should open.
Remove the black vacuum hose from the valve. After 20 seconds, the control flap should return to its original position.
If not, clean the 2 thermal vacuum valve holes on the inside of the air filter housing or replace the valve.
Install the air filter.
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