C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

07 c230 starting issue

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Old 12-13-2018, 11:19 PM
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07 c230 starting issue

2007 C230 has intermittent starting issue. The car starts normally every time when it is cold. Only time it has not started when the engine is cold, is when the outside temp is 100+. Car has new battery, voltage is good, new starter and new starter relay. When car does not want to start the key turns over, all the lights turn on but engine does not crank. For example, drove 12 miles from work to home (shut car off for 10 mins and it restarted), then after restart drove half mile to the store, shut car off for 45 mins and would not restart. Came back two hours later and car started normal after car was completely cooled down and drove fine.

Any leads on this problem would be greatly appreciated.
Old 12-13-2018, 11:55 PM
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w203 C230 Sport
Originally Posted by kason443
2007 C230 has intermittent starting issue. The car starts normally every time when it is cold. Only time it has not started when the engine is cold, is when the outside temp is 100+. Car has new battery, voltage is good, new starter and new starter relay. When car does not want to start the key turns over, all the lights turn on but engine does not crank. For example, drove 12 miles from work to home (shut car off for 10 mins and it restarted), then after restart drove half mile to the store, shut car off for 45 mins and would not restart. Came back two hours later and car started normal after car was completely cooled down and drove fine.

Any leads on this problem would be greatly appreciated.
I am not sure if this will work but try swapping your horn relay and your fuel relay.

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