1. Remove the air filter.
2. Turn on the ignition, disconnect the hose from the thermal time relay and the hose from the tee of the vacuum ignition regulator and blow into these hoses.
3. At an intake air temperature of +20°C, the relay contacts must be open. At temperatures below 20°C, the relay should turn off approximately 15 seconds after the ignition is switched on.
4. To replace the relay, disconnect the block and remove the valve from the intake manifold.