Car dies on me - needs towed - Mercedes-Benz Forum

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post #1 of 49 (permalink) Old 04-19-2017, 03:16 PM Thread Starter
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Car dies on me - needs towed

E300D - Picking up someone at the airport today. I pull into the terminal and am idling for no more than about fifteen seconds and the cars shuts down. Won't start again although it cranks just fine. No check engine light. It looks like the fuel lines are full. Half a tank of fuel and the first half of it went through the system just fine. So I had to have the car towed home about 45 miles.

When i get home the tow truck driver turns the key and the car fires right up. Seems just fine. Haven't had a chance to hook up my OBD scanner yet, but I'll do that tomorrow, if I don't find out anything else.

So what could it be and where do I start looking? Nothing like this has ever happened before. I'm stumped. First thought is to check both of the filters, but they certainly aren't due for replacement yet. Maybe a bad batch of fuel?

Side note - I went through several heavy downpours on the way to the airport, but never went through any water more than a couple of inches deep.

Len
'59 220S Cabriolet - for sale - http://www.bruceadams190sl.com/1959-...20s-cabriolet/
'83 240D original owner 351,500 miles - sadly I let it go
'88 560SL 41,000 miles being parted out - https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 207,000 miles
'03 SLK320 37,500 miles
'14 Smart electric 10,500 miles
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post #2 of 49 (permalink) Old 04-19-2017, 03:41 PM
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Sounds like the CPS. Or possibly its wet connector.
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post #3 of 49 (permalink) Old 04-19-2017, 03:47 PM Thread Starter
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Thanks for the reply. Tell me more about the CPS. What is it and where is it and is there a test for it?

Also crossed my mind that I got a bad batch of fuel or maybe I'm growing some penicillin in my tank, since the car gets rarely used these days - 3000 miles in the past year.

Len
'59 220S Cabriolet - for sale - http://www.bruceadams190sl.com/1959-...20s-cabriolet/
'83 240D original owner 351,500 miles - sadly I let it go
'88 560SL 41,000 miles being parted out - https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 207,000 miles
'03 SLK320 37,500 miles
'14 Smart electric 10,500 miles
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post #4 of 49 (permalink) Old 04-19-2017, 05:59 PM
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It is the crankshaft position sensor. L5/6 in the picture below

STAR TekInfo

item 12 in the list. If the CPS or (CKP as called here) suddenly stops sending messages the engine dies and you will not receive any CEL. If you get codes, it would indicate partial failure of the signal.


STAR TekInfo

How to test it ? You cannot really test it unless you have a scope. Typically you replace it if it is confirmed that the CKP is at fault.

With a CKP fault, the engine dies when hot, and it will crank but not start for 15 minutes or so, after the engine cooled down a bit. The failure can show itself in the most inconvenient time, so if it is the problem, replacement is the only option.

Regarding the fuel issue, only you know what the condition of the fuel is, however I would have thought, you would have rough idle, even after the car restarts, if bad fuel is the suspect.

Connect the scanner and maybe some pending code will come up.
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post #5 of 49 (permalink) Old 04-19-2017, 06:04 PM
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Could be a failing SOV too.
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post #6 of 49 (permalink) Old 04-19-2017, 06:12 PM
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Both of CPS and SOV are pretty bulletproof on diesel, but it could happen.
I bet $2 on CPS.
Bad news the older computers don't monitor those things, so with lack of codes, you have to start dropping parts.

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post #7 of 49 (permalink) Old 04-19-2017, 06:22 PM Thread Starter
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Are you guys pretty much ruling out the K40? It is original to the car, but I have a spare that I've been hauling around for ten years. My thought initially was to swap out the K40 and see if the problem reoccurs. If it does, then that certainly would point to one of the other parts. Cost of the CPS is $80, so that's not going to break the bank. Shutoff valve I think I replaced years ago. I just hate to throw parts at a problem if I'm not positive I know what the bad part is.

Of course here is another data point that may confirm an issue. I just went out to start the car again and it started up just fine twice. Never took it out to heat it up though. So I can drive it as it is, but I'd hate to have to be towed again, although maybe as you say, once the car cools down, it "might" start again and get me home?

Len
'59 220S Cabriolet - for sale - http://www.bruceadams190sl.com/1959-...20s-cabriolet/
'83 240D original owner 351,500 miles - sadly I let it go
'88 560SL 41,000 miles being parted out - https://sites.google.com/site/mercedesstuff/home
'99 E300 turbo 207,000 miles
'03 SLK320 37,500 miles
'14 Smart electric 10,500 miles
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post #8 of 49 (permalink) Old 04-19-2017, 06:29 PM
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You can make up whole list what it COULD BE, including dirty tank "sock" and who knows what else, but with lack of monitoring system, you will have to test it the hard way.
Back on youtube you will find a video how a guy tested bad CPS on the bench using hairdryer.

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post #9 of 49 (permalink) Old 04-19-2017, 06:35 PM
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Well, I am not really ruling anything out. It failed only once, and not enough data. But it is not like rough idle or surging, it is a complete shut down, which can happen in a bad neighborhood. I have not yet to replace a CPS. I have one spare, but not for installation at the road-side. I happen to carry a bottle of water in the trunk, Carefully and slowly pouring over the CPS may cool it down enough to restart the car with minimum downtime, if such a fault comes up.
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post #10 of 49 (permalink) Old 04-19-2017, 06:48 PM
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Originally Posted by sokoloff View Post
Cost of the CPS is $80, so that's not going to break the bank.
Hi Len,
I had something similar happen on our e320 and it was the cps. I bought a genuine Bosch part for quite a bit less than the dealer price. FCP Groton has them.

By the way, my wife who usually drives the car told me after it happened to me - 'It happens all the time" Just let it cool off

1972 350SL 4.5L - MBGraham, near Kingston, Ontario
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