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

Need help guy, Crank but NOT Start

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Old 04-23-2015, 09:18 PM
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Need help guy, Crank but NOT Start

I have 2007 S550 with only 6K miles. The past couple weeks it start acting up. Sometime Cranking but NOT Fire Up
I thought Crank Sensor so I got one and Replaced "still the same problem".
2nd thought Fuel Pump Got one and Replaced "Still...."

Any idea guys?
Thanks
Old 04-24-2015, 01:14 AM
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You just thought those parts were bad and changed them? the problem could stem from anything from electrical to mechanical.
Why waste money playing a guessing game with random parts when you can simply take it to a mechanic with the proper diagnostic tool to guide you to the problem source real quick?

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