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Car takes 1-2 seconds longer to crank on a cold start? Any ideas?

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C-Class (W204) 2008 - 2014: C180K, C200K, C230, C280, C300, C350, C200CDI, C220CDI, C320CDI

Car takes 1-2 seconds longer to crank on a cold start? Any ideas?

 
Old 09-20-2014, 04:15 PM
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2008 W204 Sport
Car takes 1-2 seconds longer to crank on a cold start? Any ideas?

The car runs great at all times, and starts fine when warmed up. But on a cold start the car takes 1-2 seconds longer to fire up. There are no service/check engine lights and I had the cars memory checked for stored faults and everything came up ok. I want to believe it is a crank sensor or cam position sensor, but I don't want to throw money at it if I am not sure exactly what is causing this. Glyn, any suggestions or anyone have any insight on any good troubleshooting? Thanks.
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Old 09-20-2014, 05:12 PM
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2008 W204 Sport
Update*

I removed all the connectors from the cam position sensors and cam shaft magnets to look for any corrosion in the pins and found no corrosion, but on bank 1 on the intake cam magnet sensor, I found a bit of oil pooled up inside around the pins, and bank 2 exhaust cam magnet, found a bit of oil pooled up in there as well. I sprayed them out with some cleaner as any kind of fluid in contact with any part of an electrical system can cause a short. I will post an update once I can perform another cold start. In the meantime, anyone who has experienced this or has any ideas please let me know!
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Old 09-21-2014, 12:06 AM
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in my case, I found that if I turn the key gently and slowly to the position that just connect the starter to crank, it startup perfectly fine. But if i just turn the key all the way down, there will be at least 6-7 crank before the engine fires up.

So weird.
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Old 09-21-2014, 01:56 AM
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2008 W204 Sport
I believe there is a recall on the cam solenoids or cam magnets.

B21: MERCEDES DRIVEABILITY 2012070002 cam solenoid

Will they replace the cam solenoids or just replace the harness?

Last edited by xXHotelCrazyXx; 09-21-2014 at 02:01 AM.
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Old 09-21-2014, 10:55 AM
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2008 W204 Sport
*Update #2

Went out to perform a cold start on the engine and it started up great for the first time in a month! I believe I have solved the issue with the hard cold start by cleaning out the bit of oil that was found sitting inside a couple of the cam position sensor electrical connectors.
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