| Malfunction | Cause | Solution |
| Cold engine won't start | Problems with automatic start | |
| a) the vacuum diaphragm is not working | Remove the obstruction or replace the upper part of the carburetor | |
| b) the bimetallic spring is damaged or disconnected | Connect or replace the spring | |
| c) the air damper is stuck | Release the damper | |
| The float needle valve is stuck | Clean or replace the valve | |
| The carburetor is leaking fuel | If the engine is flooded due to overflow of the carburetor, start it with the accelerator pedal fully depressed | |
| High idle speed | The automatic starter does not turn off due to damage to the bimetallic spring | Replace the bimetallic spring |
| The engine idles unsteadily and stalls | Idling speed is too low | Set the recommended speed |
| The idle mixture composition is incorrectly adjusted | Adjust the mixture composition | |
| The idle jet is clogged | Remove and clean the jet | |
| The fuel shut-off solenoid valve is faulty | Check and replace the valve if necessary | |
| No engine preheating | Turn the automatic starting unit so that the bimetallic spring stretches more | |
| The engine is unstable at idle, the exhaust pipe "smokes" | The automatic starter is faulty | Check the automatic start |
| The float needle valve does not close | Check the valve and fuel pump supply pressure | |
| The float is leaking | Replace the float |
The original can be found at www.VWManual.ru
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