53k miles and almost stalling/rough idle (rare)

Sep 14, 2009 | 09:56 PM

AmazinglySmooth

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E500

53k miles and almost stalling/rough idle (rare)

Tonight, my e500 almost stalled after coming to a stop after hauling along at 55mph for 5 minutes straight. Is it time for new plugs? I got no error messages. I've seen it a few other times, but it isn't consistent. Any suggestions?

Sep 15, 2009 | 01:07 AM

Barry45RPM

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From: Ft. Lauderdale Area, USA

2015 ML 350

Possibly the Crank Position Sensor.

Sep 15, 2009 | 09:42 AM

AmazinglySmooth

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E500

Would a code show up for that? Would I get an error message?

Sep 15, 2009 | 03:45 PM

AmazinglySmooth

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E500

It seems to happen right after I brake hard (to near stopping or to stop). If I slow down easily, then it doesn't seem to misfire (or not nearly as badly). Any advice?

Sep 15, 2009 | 07:22 PM

MercFiveHundred

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From: NY

2014 E550; 2003 E500

what year? 4 matic?

Sep 15, 2009 | 07:43 PM

AmazinglySmooth

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E500

2005; not 4matic.

Sep 15, 2009 | 11:22 PM

DrDrilZ

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GT3, GTR, 570S

LOL at your username and thread.

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Jun 16, 2011 | 07:27 PM

hussainj79

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2005 E500

Any solution? same thing happened to me today

Jun 16, 2011 | 08:15 PM

#10

AmazinglySmooth

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E500

It was the crank position sensor. The dealer did a temperature test to find the problem.

Jun 17, 2011 | 09:30 AM

#11

hussainj79

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2005 E500

Ok thanks i will take into the dealership this week and ask them to do the same. I have the exact same car as you so most likely it is the same problem.

Jun 17, 2011 | 12:44 PM

#12

AmazinglySmooth

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E500

Quote:

Originally Posted by hussainj79

Ok thanks i will take into the dealership this week and ask them to do the same. I have the exact same car as you so most likely it is the same problem.

The independent shop I first tried couldn't figure it out. The dealer's temperature test uncovered the problem.

Jun 17, 2011 | 10:53 PM

#13

MercFiveHundred

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From: NY

2014 E550; 2003 E500

Quote:

Originally Posted by AmazinglySmooth

The independent shop I first tried couldn't figure it out. The dealer's temperature test uncovered the problem.

Maybe asking a sstupid question... but what's this temperature test do?

Jun 17, 2011 | 11:39 PM

#14

AmazinglySmooth

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E500

Quote:

Originally Posted by MercFiveHundred

Maybe asking a sstupid question... but what's this temperature test do?

I'm not a tech, but my understanding is the sensor is marginal and provides reduced signal as the temperature increases. The problem isn't manifest until it gets hot. I think they just heat up the sensor with a heat gun.