Mercedes KE-Jetronic and K-Jetronic - Warm Start Problems - Mercedes restoration

Problems starting after parking at operating temperature.
Over the years, Mercedes Benz vehicles with K-Jetronic and KE-Jetronic have repeatedly had problems starting when the engine is warm after standing for more than five minutes. This is caused by the pressure accumulators, once at the fuel pump package and once at the flow divider.

The warm-up regulator in the K-Jetronic is responsible for regulating the fuel supply depending on the engine temperature. It ensures that the engine receives a richer mixture composition at cold start to ensure easier starting and stable idling. As the engine warms up, the mixture becomes leaner to optimise fuel economy and reduce emissions.

The warm-up control in the K-Jetronic normally works by means of bimetallic strips or similar temperature-sensitive elements. When the engine is cold, these elements cause the regulator to increase fuel pressure and thus enrich the mixture. As the temperature rises, the regulator gradually opens and reduces the fuel pressure to dilute the mixture.

It is important to note that the K-Jetronic has been largely replaced in modern vehicles by electronically controlled fuel injection systems, which offer more precise control options. The warm-up controller in the K-Jetronic is therefore a relic of the past and is no longer found in current vehicles.

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Work on vehicles requires special expertise. Always commission an authorised workshop for repairs and maintenance. The articles shown here are in no way a substitute for specialist literature and are intended as suggestions and as a means of passing on information.
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