engine dies while driving - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 02-11-2014
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engine dies while driving

I have a 1999 slk230 and every once in a while, usually after driving for 30 minutes, the car will die, even if I am driving and not arriiving at a stop etc.
All the dash lights come on. The yellow low fuel also is on even if I have a 1/2 tank of gas. The engine turns over, in fact it is like it sticks turning the engine over if I take my hand off the key. I wait aprox. 30 minutes and it starts like nothing happened. I have read about the crankshaft position sensor and someone said it sounded like the fuel pump gets hot and after it cools off it starts pumping again. Great performance except when it wont start? I just joined so I hope this is posted at the right place. Also any help on the location of the cps would be greatly appreciated. Thank you in advance for any help provided.
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#2 Old 02-11-2014
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#3 Old 02-11-2014
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#4 Old 02-11-2014
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Do a search for K-40 relay as a place to start ...
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#5 Old 02-11-2014
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By any chance is the engine cooling fan running on high during the "no start"?
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#6 Old 02-11-2014
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Quote:
Originally Posted by Garrett F Jackson View Post
. . . after driving for 30 minutes, the car will die, even if I am driving and not arriiving at a stop etc. . . . .
Other than the last part, it sounds exactly like a crank position sensor over heating failure . . . I had one! Of course I have a different engine, so it might not be as applicable. The question about the last part is only, does the sensor get hot enough to quit. Doesn't really matter if you are driving or idling. It only happens after a longer period if it's cooler. (And not at all if it's cold enough and you keep the air moving past the sensor.)

I don't remember if a code shows up for that, but I think it does. Listening to the mechanics, it sounded like it showed as an over-temp before it died.

I think you'll need to get the codes pulled from the car. Getting stranded like that can be a real pain!
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#7 Old 02-12-2014
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Pull the K40 and check the solder joints. I had the exact same problem and even had the exact same thought about the fuel system getting to hot. I fixed it with re-soldering my K40 and haven't had one problem since.
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#8 Old 02-13-2014
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I think I will replace K40 and Crankshaft position sensor
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#9 Old 02-16-2014
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Replacing the K40 might be expensive. Pull it and look at the solder joints, it is an easy fix if you know what you are doing and if not a hobby shop or a friend can do the repair. The cost should be less than $5 if you have to buy solder and FREE if you don't. I would do this first as it is super easy and will save you cost and time of having to replace the crank sensor, if the K40 is the culprit.
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#10 Old 02-16-2014
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There's always time to buy a new one if re-soldering it doesn't work !
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#11 Old 02-23-2014
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Mine did same thing and MAF was filthy. Cleaned it and ran like a top.
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