AmazinglySmooth

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?

Barry45RPM

Possibly the Crank Position Sensor.

AmazinglySmooth

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

AmazinglySmooth

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?

MercFiveHundred

what year? 4 matic?

AmazinglySmooth

2005; not 4matic.

DrDrilZ

LOL at your username and thread.

AmazinglySmooth

It's why I'm so sensitive to the car's rough idle.

hussainj79

Any solution? same thing happened to me today

AmazinglySmooth

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

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.

AmazinglySmooth

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

MercFiveHundred

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

AmazinglySmooth

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.