Question about 1998 Mercedes-Benz C-Class

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Hi I have a 1998 C180 1799cc automatic. Sometimes it is difficult to start. turns but will not start. need to give a little pedal but shouldnt have to according to manual. Seems to start without problem when cold.

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You have no problem with cold start it means your cold start valve is working. However the cold start valve is controlled by the signal from ECU. If it sees temperatre sensor reported that weather is hot, it won't release a signal to turn on the cold start valve. Your case is that it turns on anyway- Why do I know? The engine only run if you have a correct air/ gas at ratio 14.6. Since cold start giving the spray when not needed makes the mixture rich, so by depressing pedal a little it opens the throttle body so more air could go in to mix the right air /gas ratio making engine starts. Try to look for temp sensor and test them according to your service spec, it it is not matching then replace them. Some people think that the time to gather Resistance spec for these sensors is more valuable then just buy new ones to replace. But every one has a different approach, you do whatever you are comfortable with. Good luck on the finding.

Posted on Jul 15, 2009


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