Gasoline - Mercedes-benz - C-class :: Rough Idle / Smell Of Gas In Exhaust / Less Power Than Normal


Oct 12, 2011

I filled up my car at the local gas station. It had been raining non-stop for the past three days and nights. 10-15 minutes later as I'm stopped at a light, the car starts shuddering, almost stalls a few times. Rough idle all the way home.

I limp home, guessing water in the fuel. Next day I go to Advance Auto and buy some fuel additives which are supposed to solve the water problem. The guy there mentions that he's had a number of reports of similar issues from this particular gas station (it's now out of business, go figure). Additives make things better but not fully.

2 tanks of gas later now and the rough idle is much better but not gone. Car seems to have less power and sounds a little bit raspy on acceleration (not noticeable unless driving near a wall which can bounce the sound back). My guess is that one of the cylinders is not firing, maybe needs a new spark plug?

The more worrisome thing is that as the car has started running more smoothly I've also noticed a smell of gas after startup (may still be there when running but I don't notice it then) -- coming from the exhaust. This seems to be in-line with the missing cylinder theory but I'm running blind here as I don't have much experience on this topic.

The car's a 1997 C280. 130K on it. It's old but mechanically the thing has been a tank so far (Inline 6 I think) -- very sturdy and responsive. I'm hoping that this whole ordeal hasn't done permanent damage.

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Hot or cold car always starts,Idles perfect , then RPM drops, Idles rough and stalls. Econometer moves to Red area.car will easily restart and drives well,it also idles well. Once engine is shut down, even for a short while, It does the same thing again. Car is used for short trips. Ambient Temperature 80 degrees. Once running car is perfect at all speeds and idles smoothly. Hero 1987 MB 560 sel ....

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My 1994 mercedes C220 stalls at idle. the local mercedes dealer told me that it is caused by the alternator overcharging. can this be true??

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Recently I brought my car for an oil change. They put the recommended full synthetic oil in and when I left the cel starting blinking and the car idling extremely rough. I brought the car immediately back (only drove ~1/4 mi.). They discovered that they put too much oil in the car. Despite their efforts of removing oil and changing filter x2, they could not get the cel to stop blinking or the car running correctly. I brought the car to the closest repair facility with diagnostic capability and they noted the car was still 1qt overfull and multiple misfire, and cam shaft actuator codes were happening. Car was towed to dealership where they diagnosed fouled plugs attributed to too much oil. Oil change facility paid towing, repair and diagnostic bills for their mistake. In the subsequent 2 weeks my car was towed two more times to dealership. Once for going into limp mode after misfires and once for fuel pump dying. Is this all a coincidence or could this be repercussions from botched oil change? Dealership says it is just coincidental.

Car is a 2007 Mercedes clk350 cabriolet.

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Stall - Mercedes-benz - E-class :: E320 Stalls At Idle When Cold

Car: 2000 Mercedes-Benz E320 (W210) 4matic

This car runs beautifully if the air temperature is above 60 degrees or so (maybe 65) Fahrenheit.

If the air temperature, however, is much cooler, and the engine has had enough time to cool to air temperature, it stalls. Here's the sequence:- Start the car. Car runs fine, sounds good. Initial idle speed about 1200-1500 RPM.- Wait for car to warm up for a few seconds so it settles into normal idle. Idle speed settles to about 800 RPM after 5-20 seconds, depending upon air temperature.- Shift car into gear (D or R - doesn't matter). Idle speed drops to 500 or so, then the car stalls.- Restart the car. Allow it to warm up significantly (how much depends upon air temperature). - Shift into gear (D or R). Engine idle speed drops a bit, then recovers to ~800 RPM. No problems after that.

If it's a little cool (55-60 degrees Fahrenheit), I can drive off once the engine temp gauge needle rises a few degrees (45-50 degrees Centigrade).If it's around freezing (20-40 degrees Fahrenheit), I can't drive off until the engine temp gauge reaches nearly 80 degrees Centigrade.

If I'm on a hill (pointing down), I can start at a slightly lower temperature by allowing the car to start rolling as soon as I shift into gear. In this case, there's less resistance, so the idle speed doesn't go low enough to stall the car. If I am on a level surface (or pointing uphill), 80 degrees Centigrade seems to be almost a magic number when the air temperature is below 40 Fahrenheit (near freezing). When the needle is showing about 78 degrees Centigrade, the car will still stall. When it reaches 80 degrees Centigrade, the car is fine, and will not even come close to stalling when put in gear.

ONE CONFUSING VARIABLE: When I took this to my mechanic, it didn't exhibit the problem for him. When I picked it up (about 30 Fahrenheit), it stalled. He came out and started it, put it into gear, and it idled without stalling. I got in and let him watch while I got in, started it, put it into gear, and it stalled. We have no explanation as to why this would be any different (we tried several times, varying techniques, brake pressure, etc., with the same confusing results).

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