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occasional long crank time to start

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

occasional long crank time to start

 
Old 03-31-2018, 08:45 PM
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2011 E550 P2 4M Sedan
occasional long crank time to start

My car generally starts without issue or drama. However, on a few occasions in the past few months (very rare), it will crank several times before it roars to life. The CEL does not come on at all. All the other times, it cranks once and fires right up.

For example (and this is the most recent one since it just happened this evening), the car started at home just fine (first crank today) and then took a short drive (10 minutes) to local shops. When I got out of car I noticed I had pulled forward too far into the next space (360 is on wish list for next car). So I jumped back in to restart the car and reverse a couple of feet and it took a few seconds (maybe 4-5) to crank. Other times it's happened that I can recall were in the morning after a short trip and then restarting the car about an hour later. However, more times in the same situation (short drive, an hour later) it starts right up with no delay.

Again I should stress that this rarely happens so it is just something I am keeping an eye on for now. Any advice?
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Old 03-31-2018, 08:58 PM
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Possible crank position sensor going bad.
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thefisch (04-01-2018)
Old 04-01-2018, 12:35 PM
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+1
Same thing here , even tho i got a new battery and had my starter replaced couple years ago.
makes me wonder if the new starter is going bad or something else is up.
would be nice to figure this one out.
also noticed i had that happening more often with bosch spark plugs. (Probably not related anyhow but is what i have observed)
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thefisch (04-01-2018)
Old 04-01-2018, 01:30 PM
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Thanks for the feedback. So if it's a sensor then the problem would become more common before it fails. I still have a couple of years left on my extended warranty (non MB ELW) but without a consistent, evident problem there is no claim.
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Old 04-02-2018, 10:16 AM
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Did you check to see if the CPS has thrown a code? When my CPS was failing in the W211 it had thrown an error code that was logged on the times my car failed to start normally. It is a cheap part, but placed in a rather difficult spot to achieve easy access. I had bought the sensor and had my indy replace it.
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thefisch (04-02-2018)
Old 04-02-2018, 05:08 PM
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I will check to see if my reader picks up a code. Doubt it - I think it only does CEL codes. I think I would need the MB diagnostic system to read any logged error codes.
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Old 04-02-2018, 05:48 PM
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Yeah, I think you are probably correct about that. My Indy picked up the code to verify the issue with his deluxe scan device. The fault code was in there even though I could still start and drive the car ( thatís of course when it would start).
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Old 04-02-2018, 06:41 PM
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Originally Posted by KEY08 View Post
Yeah, I think you are probably correct about that. My Indy picked up the code to verify the issue with his deluxe scan device. The fault code was in there even though I could still start and drive the car ( thatís of course when it would start).
If it doesn't show up with my device, I will have a chance for indy to check when I get my brakes done. It will be interesting to see if it shows an error for that.

The good news is that the problem didn't occur at all yesterday or today. About 10 starts since it last occurred with many just a few minutes to an hour apart.
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Old 04-02-2018, 08:34 PM
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Originally Posted by thefisch View Post
My car generally starts without issue or drama. However, on a few occasions in the past few months (very rare), it will crank several times before it roars to life. The CEL does not come on at all. All the other times, it cranks once and fires right up.

For example (and this is the most recent one since it just happened this evening), the car started at home just fine (first crank today) and then took a short drive (10 minutes) to local shops. When I got out of car I noticed I had pulled forward too far into the next space (360 is on wish list for next car). So I jumped back in to restart the car and reverse a couple of feet and it took a few seconds (maybe 4-5) to crank. Other times it's happened that I can recall were in the morning after a short trip and then restarting the car about an hour later. However, more times in the same situation (short drive, an hour later) it starts right up with no delay.

Again I should stress that this rarely happens so it is just something I am keeping an eye on for now. Any advice?
Mine was doing the same thing last year and the battery was the culprit. Every now and then it would take a few seconds of cranking to start the engine. One day after 5 or 6 starts and stops in less than 1 hour while running errands around town, it wouldn't start at all. It didn't throw any codes, not anything a generic scanner would see anyway. The cure was recharging the battery with a Ctek smart charger. I used the battery "rejuvenation" program these things come with for a few days and it's been fine ever since. I occasionally top off the battery every couple of weeks, especially when I only drive locally very often. The W212s have a dumb charging algorithm which will kill the battery if the car is driven short distance with many engine start/stop sequences frequently.
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Old 04-02-2018, 09:02 PM
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My battery is about 3 years old and perhaps it's getting a little long in the tooth for Florida. My Honda goes through batteries every 2.5-3 years down here like clockwork and that car's alternator always puts out 14.7v unlike the MB. Unfortunately because this long crank issue isn't happening consistently, I can't just charge the battery and see if that fixed it. Maybe if there are no stored error codes for the CPS then I can focus more on the battery. Or wait until there are more consistent starting issues or other signs of a fading battery like short convenience time after the engine is turned off.

I do love my ctek 4.3 charger so I am ready if the battery is an issue. I do a 'normal' charge cycle with the ctek every 6 weeks to try and compensate for the smart alternator. The last time was 4 weeks ago. I haven't done the 'recondition' cycle on the battery as it is best to remove from the car for those due to the higher voltage used.
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Old 04-02-2018, 09:15 PM
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Mine was 2.5 years old as well( manufacturing date July 2015) when it got discharged and wouldn't start the car. I wasn't charging it at all before it died on me because I didn't have the Ctek at the time. After running the reconditioning routine a couple times ( negative and positive cables detached but battery still in vehicle - a dumb practice because it could potentially spill its guts when it gets hit with 15+ V) and regularly hooking it up to the charger I haven't experienced the delayed start at all. It's been 5 months now. At first I was looking at the fuel distribution system as a possible culprit or some sort of electrical gremlin but couldn't find anything due to occurrence inconsistency or any sort of obvious fault. The battery for me was the last place I would have looked, I thought it was cranking just fine.
I didn't know heat kills batteries, I always thought it was the cold that gets them faster. I always lived in colder climate areas though so I have 0 experience with how heat affects accumulators.

Last edited by Oda112; 04-02-2018 at 09:20 PM.
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Old 04-03-2018, 09:33 AM
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I had exact issue on my 2010 e550...still under CPO. Replaced the starter and battery (goodwill on the battery) under warr
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