E-Class (W212) 2010 - 2016: E 350, E 550

Cranks but won't start. No error code

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Old 08-08-2019, 09:30 PM
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2008 e350
Cranks but won't start. No error code

Hi everyone,

I have a 2008 e350. It cranks but will not start. When we plug in a diagnostic tool, it doesn't show any error messages.

So far we have tried replacing the crankshaft position sensor and are now looking at the fuel pump relay as a possible suspect.

Putting a few drops of gas in the air intake will start the engine.

Also, if the car is cold, such as in the mornings, the engine will start without a problem.
Old 08-09-2019, 12:54 AM
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2013 E550 4MATIC - P1, P2, SPORT
I know very little about cars... but could that be a MAF sensor issue? Since colder air is more dense, it allows "more" in in the morning.
Old 08-09-2019, 09:08 PM
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2013 E550 4MATIC - P1, P2, SPORT
Also, you should consider changing the title to "Car cranks but only starts when it's cold." The more descriptive the better. Maybe someone else has had a similar issue.
Old 09-25-2019, 07:23 PM
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2008 C300 Sport
I hear there is a TSB for the 2008's to change 4 relays under the hood. Bad batch of relays suspect.

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