Engine Starts After Very Long Rest Between Drives - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 06-19-2019, 07:22 AM Thread Starter
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Engine Starts After Very Long Rest Between Drives

Hey guys,
In the last few days my car was was very mildly hesitant during starting just a couple of times which I thought was so minor, I ignored it. Yesterday the engine stopped on the road when I slowed down to a stop in rush hour traffic and would not start again. I tried twice in 15 or 20 minute interval and it would not start. My Indy friend told me over the phone sounds like dead battery, which made sense cause just about 2 weeks ago I had it tested at Auto Zone, where it read "bad battery 85%", which surprised me cause there was no indication of bad battery at all. But yes I had bought the battery back in 2006. After about 2 hours it started and I quickly parked it properly but wasn't confident to drive back home. So my friend brought a new battery after work. It cranked up and I drove back home on my driveway. Then in 5 minutes it would not start again, tried in gaps but would not. After about more than an hour it did and I put it in the garage.
So guys, what else could it be? I am thinking did the crank shaft sensor go bad again, cause I was having starting problem (never engine cut off while driving) back in 2011 when replacing the CPS was the fix. Like always I put in OEM and this one was from Bosch.
The pattern I am noticing here is as if its needing long rests between each drive!
Any thoughts or ideas?

ps, I recently replaced the motor and transmission mounts which made my car drive like new and other than that no repairs or any work...
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post #2 of 5 (permalink) Old 06-19-2019, 11:12 AM
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Sounds like an electrical issue. Just a stab here, but perhaps the K40 relay?

A few months ago, a gal in the neighborhood had a similar type of issue and it was her K40 - intermittent issue like yours.
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post #3 of 5 (permalink) Old 06-19-2019, 01:04 PM
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Can you have the codes read? Ideally with the Mercedes 38 pin connector. It’ll cost an hour of shop time at your local dealership but it will save loads of time on guess and check, and you’ll know exactly what’s wrong with it.
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post #4 of 5 (permalink) Old 06-19-2019, 04:31 PM Thread Starter
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Hello my wonderful friends! OBD II at Auto Zone read "P0335 Crankshaft Position Sensor A Circuit" error. They had my sensor for $60 with lifetime warranty and I grabbed it and installed it right there - no more trouble after that. Let's see if it acts up again! This time I did not care for a OEM Bosch part as the life time warranty seemed a pretty good offer. I googled and found the Duralst brand fails lasts for 7-8 years average. Also the sensor looked exactly like the Bosch part except w/o any markings - just a plain body replica of Bosch! Let's see if I made the right decision...
BTW replacing is a snap -
1) Locate the sensor for your engine type using google / youtube (mine is M112).
2) Squeeze and pull off the plug gently and cap it with a 5" size balloon to prevent dirt getting to the contact (yes I learnt that from Hella Service and now I have a pack of 100 or so from Dollar Tree or Party City!)
3) 7mm torx head is what I used to unbolt/bolt back the screw that holds the sensor in its socket and you may use a long extension as it is down on the side of the engine on the ds.

Lets hope that is the happy ending! Thanks a lot guys! See you all next after I replace my AC compressor that is in its own thread!
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post #5 of 5 (permalink) Old 06-21-2019, 12:37 PM
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Wait so the CPS was the issue again. You already replaced it in 2011. This is odd for it to fail twice like this.

But the signs were there. Hot the car dies cold the car runs.
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