Engine Dying Out After Warm Start
Thread Starter
Senior Member
Joined: May 2014
Posts: 485
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From: Concord, CA
'13 E350 . M276
Engine Dying Out After Warm Start
I've owned this car for about 3 months now. I've had a situation where after starting on a warm engine, it immediately dies out. It will restart, but a little shaky like there's an electric short or gas/air mixture problem, not sure! It has happened 3 times thus far. I've also noticed that when restarting on a warm engine, it starts kinda harsh, like one is putting their foot on gas. We're over 113K miles now, and it's a PZEV vehicle. All services were done at dealer. On PZEV cars, many systems are under warranty until 150K miles.
I've recently ran a star diagnostics on it but nothing came up. Not sure if taking it to stealer is worthwhile since they'll charge me for diagnostics and end up telling me all is fine.
I've recently ran a star diagnostics on it but nothing came up. Not sure if taking it to stealer is worthwhile since they'll charge me for diagnostics and end up telling me all is fine.
Thread Starter
Senior Member
Joined: May 2014
Posts: 485
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From: Concord, CA
'13 E350 . M276
Yes, battery is charging fine and when doing diagnostics, it shows 14.8V. No codes for current symptoms! It cranks up from first touch and fires up every single time. On cold engine, it start nice and smooth. If CPS is the culprit, is it a matter of time till it throws a code?
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The CPS will act up and get worse and worse until it fails. It does not usually fail without some warning. It’s possible that it hasn’t triggered a fault code yet. Maybe just keep an eye on things. If you get to a point where the warm engine won’t start at all, let it cool for 30 minutes or so. The car shouldn’t leave you stranded. Fisch is probably right and this could be your problem. The part is cheap, but getting at it is a real pain.
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Newbie
Joined: Oct 2020
Posts: 2
Likes: 1
From: Richmond, Va
W212
CPS?
Hi Stuttgarten,
Ive got the exact same issue with my 2013 E350. Intermittently starts then dies just like you described. No CEL. After a few tries will start with rough idle til you give it a little gas. Wondering if you have been able to fix and if so was it the CPS?
thanks!
Ive got the exact same issue with my 2013 E350. Intermittently starts then dies just like you described. No CEL. After a few tries will start with rough idle til you give it a little gas. Wondering if you have been able to fix and if so was it the CPS?
thanks!
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Joined: May 2012
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From: Pepper Pike Ohio
24 GLS580 '23 E450 4matic 12 E350 4Matic
Hi Stuttgarten,
Ive got the exact same issue with my 2013 E350. Intermittently starts then dies just like you described. No CEL. After a few tries will start with rough idle til you give it a little gas. Wondering if you have been able to fix and if so was it the CPS?
thanks!
Ive got the exact same issue with my 2013 E350. Intermittently starts then dies just like you described. No CEL. After a few tries will start with rough idle til you give it a little gas. Wondering if you have been able to fix and if so was it the CPS?
thanks!
Last edited by pierrejoliat; Oct 5, 2020 at 01:39 PM. Reason: Misspoke
Thread Starter
Senior Member
Joined: May 2014
Posts: 485
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From: Concord, CA
'13 E350 . M276
Mine never had a CEL, I would start it and it ran fine until it warmed up, then it would die. I would let it cool down, then it would start fine, until it warmed up again. I changed the CPS and it was fine after that. It did progressively get worse over the course of the five days when it started stalling until I changed it out.
Thread Starter
Senior Member
Joined: May 2014
Posts: 485
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From: Concord, CA
'13 E350 . M276
I never changed CPS because I prefer not to throw parts at car without having a diagnosis. My diagnostics showed no codes or problems. Also, the problem is so random and occurs when car is cold and also when hot, and it could occur 2 days in a row or be problem free for 2 months, as was the case recently. I decided to change spark plugs recently hoping it would change the situation, but it did not help. I'm at a loss, and seriously thinking of ditching this W212 and owning no more Benzes. I'm an avid reader of Consumer Reports and Mercedes almost always gets poor reliability marks on that reputable publication.
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From: Austin, TX
2013 SL550 BiTurbo
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2011 E-350 4Matic Sport
Whenever I'm faced with random fail/ok scenario I will usually look at wiring and connectors first.
Of course there's no hard and fast rules on repairs but sensors "typically" will store a code as they fail. May not activate CEL but sometimes a permanent or pending fault can be found when looking at vehicle modules and not necessarily in generic OBD data.
Suggest a close visual and hands on wiggle test of engine wiring and connectors and upstream O2 harnesses/connectors. If there's a problem there, it can show up as that random problem you've described.
This can be maddening. Couple years ago I went crazy trying to find random misfire on son's civic. Finally traced it to 2 poor pin connections at the ECU. I don't drink but I seriously considered it at that time.
Of course there's no hard and fast rules on repairs but sensors "typically" will store a code as they fail. May not activate CEL but sometimes a permanent or pending fault can be found when looking at vehicle modules and not necessarily in generic OBD data.
Suggest a close visual and hands on wiggle test of engine wiring and connectors and upstream O2 harnesses/connectors. If there's a problem there, it can show up as that random problem you've described.
This can be maddening. Couple years ago I went crazy trying to find random misfire on son's civic. Finally traced it to 2 poor pin connections at the ECU. I don't drink but I seriously considered it at that time.
Thread Starter
Senior Member
Joined: May 2014
Posts: 485
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From: Concord, CA
'13 E350 . M276
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Joined: Feb 2014
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From: MA
2008 E350 4Matic, 2011 E350 4matic
I never changed CPS because I prefer not to throw parts at car without having a diagnosis. My diagnostics showed no codes or problems. Also, the problem is so random and occurs when car is cold and also when hot, and it could occur 2 days in a row or be problem free for 2 months, as was the case recently. I decided to change spark plugs recently hoping it would change the situation, but it did not help. I'm at a loss, and seriously thinking of ditching this W212 and owning no more Benzes. I'm an avid reader of Consumer Reports and Mercedes almost always gets poor reliability marks on that reputable publication.
