# Mercedes Benz C240 **URL:** \ **Category:** Maintenance/Repairs\ **Tags:** c-class, mercedes-benz\ **Created:** [September 12, 2013, 10:45pm UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318 "2013-09-12T22:45:06Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Shango](https://avatars.discourse-cdn.com/v4/letter/s/b5ac83/32.png) [@Shango](https://community.cartalk.com/u/Shango)\ **Post date:** [September 12, 2013, 10:45pm UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318/1 "2013-09-12T22:45:06Z")
Everytime I come to a stop, the car seems to be gasping for breath and attempt to want to stall. Occassionally the battery/alternator light comes up. It has not stalled yet and seems to catch its breath and continues once I step on the gas after the shake and after there was an air rush through the vents (I called-Caching its breath). I took it in to the dealer and the electricel was checked and they found nothing. Please help!!. Thanks ---
**Author:** ![keith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/keith/32/5518_2.png) [@keith](https://community.cartalk.com/u/keith)\ **Post date:** [September 13, 2013, 4:26am UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318/2 "2013-09-13T04:26:26Z")
Have they checked to make sure its not the torque converter lock up not sticking? Are you up to date on the transmission maintenance, i.e. ATF changes? ---
**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\ **Post date:** [September 13, 2013, 4:31am UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318/3 "2013-09-13T04:31:46Z")
I think the alternator/battery light is coming on because the rpm is so low the car thinks it is about to stop. That probably isn’t a clue. Is the check engine light on? Did the dealer read the current and pending DTC’s? When a engine isn’t running well like this, it almost always comes down to a problem in the following - Spark - Air/fuel mixture - Timing - Compression Your symptoms are not specific enough to tell where to start, so probably start from the top and work down. ---
**Author:** ![ok4450](https://avatars.discourse-cdn.com/v4/letter/o/e9bcb4/32.png) [@ok4450](https://community.cartalk.com/u/ok4450)\ **Post date:** [September 13, 2013, 9:05am UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318/4 "2013-09-13T09:05:34Z")
The info on the car is too scant and the complaint too murky to make any kind of reasonably accurate guess but this problem could be related to a vacuum leak or Idle Air Control valve issue. It’s difficult to determine if the battery light is coming on because of an electrical problem or simply because the idle RPMs are dropping too low. ---
**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\ **Post date:** [September 13, 2013, 9:12am UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318/5 "2013-09-13T09:12:54Z")
No IAC valve on this car It has an electronic throttle ---
**Author:** ![keith](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/keith/32/5518_2.png) [@keith](https://community.cartalk.com/u/keith)\ **Post date:** [September 13, 2013, 11:41pm UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318/6 "2013-09-13T23:41:02Z")
But a thorough check of all the vacuum hoses would be in order. ---
**Author:** ![Shango](https://avatars.discourse-cdn.com/v4/letter/s/b5ac83/32.png) [@Shango](https://community.cartalk.com/u/Shango)\ **Post date:** [September 17, 2013, 7:06pm UTC](https://community.cartalk.com/t/mercedes-benz-c240/81318/7 "2013-09-17T19:06:03Z")
Yeah, the check engine light do not come up. The symptons are just the vibration sign of wanting to stop, the rush of air through the vents like it receives more power, occassionally the alternator/battery light. It usually also happens when i slow down to come to a stop or when I speed up and stop there after. It has actually stopped on me once and start right up as soon as I start it again.