S-Class (W221) 2007-2013: S 320 CDI, S 350, S 450, S 500, S 550, S 420 CDI, S 600
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Start Up Issues

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Old 06-02-2017, 11:03 AM
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2007 Mercedes S550 4matic
Start Up Issues

I have a 2007 S550 with 61K on it. I started having issues at start up. It turns over but will not start. It takes about 10-15 times to start up.

I replaced the Fuel Pump relay and did not help the issue. Has anyone else had this issue and how did you solve it?
Old 06-02-2017, 11:21 AM
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1999 E300TD
Are you getting the correct fuel pressure? Are you always getting spark? When was the last time the CPS was changed?
Old 06-02-2017, 11:27 AM
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It is currently at the repair shop now and they are checking the fuel pressure. I am getting good spark. I also just asked them to check the CPS sensor, I did not think about that. Thanks for the advice.

Is there anything I should be thinking about?
Old 06-02-2017, 11:47 AM
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Are you serious---why are you doing the thinking for your mechanic---find another!
Old 06-02-2017, 11:50 AM
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This guy is good, I also just like doing my own research and being totally involved in any repair that way I learn also and some of the work I can possibly do my self.

They have worked a couple of my older Mercedes for me and did well.

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