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2026. 6. 30. 작업
난이도 & 준비물
증상
2000 VW Polo struggles to/won't start when engine warm
처리 내용
This sounds like a problem with the coolant temperature sensor . Don't worry - replacement is cheap and can be done easily by yourself or a friend who worked on cars before. Cause Cold engines need more fuel to start than warm engines. This is due to the fact that a part of the vaporized fuel condenses at the cold cylinder wall inside each cylinder. This part of the injected fuel is not available for the combustion process. Therefore, modern ECUs measure the engine temperature (by measuring the coolant temperature) and adapt the amount of fuel that gets injected during engine start and warmup. This is called warmup enrichment . If the ECU has no valid information about the engine temperature (due to a damaged sensor), the fuel mixture during engine start gets calculated incorrectly. This is not a big deal when the engine is running (worst possible side-effect: higher fuel consumption), but can prevent the engine from starting as the engine reacts more sensitively to changes in fuel-mix
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