C240 4MATIC Stalling issue
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Member
Joined: Sep 2013
Posts: 78
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C240 4MATIC
C240 4MATIC Stalling issue
2003 C240 4MATIC
176k Miles
Basically my car has problems when either it's hot/muggy out or if I've drove it for a long distance. If I'm coming to a sudden stop in traffic or if I'm turning, the car will stall to the point it will shut off or shut off & continue 5-6 seconds afterwards. Sometimes I experience the check engine light coming on if I let the car sit for days (it'll more than likely occur if it rains & then the weather becomes muggy.)
I took it to the mechanic today & they basically told me nothing was wrong & all I needed was a tune up which is hard to believe. I've googled the symptoms & so far in more than 3 situations, the solution was to either clean the MAF or to replace the MAF & CPS. Never once was a tune up the solution. I'd like to confirm if that could be my solution before I go back up there tomorrow so I can tell them to replace these things. Could maybe spark plugs cause these symptoms? Or is it more than likely MAF & CPS related?
176k Miles
Basically my car has problems when either it's hot/muggy out or if I've drove it for a long distance. If I'm coming to a sudden stop in traffic or if I'm turning, the car will stall to the point it will shut off or shut off & continue 5-6 seconds afterwards. Sometimes I experience the check engine light coming on if I let the car sit for days (it'll more than likely occur if it rains & then the weather becomes muggy.)
I took it to the mechanic today & they basically told me nothing was wrong & all I needed was a tune up which is hard to believe. I've googled the symptoms & so far in more than 3 situations, the solution was to either clean the MAF or to replace the MAF & CPS. Never once was a tune up the solution. I'd like to confirm if that could be my solution before I go back up there tomorrow so I can tell them to replace these things. Could maybe spark plugs cause these symptoms? Or is it more than likely MAF & CPS related?
Junior Member
Joined: Dec 2010
Posts: 50
Likes: 2
From: Castle Rock, CO
2021 GLE AMG 63S, 2022 GLC, and 2013 ML350 4Matic
When I read your subject, I thought CPS. But after the first paragraph, maybe a fuel delivery system issue? Do you have a fuel pressure gauge? If not, they are cheap. I have an Alfa Romeo that would do the same thing and ended up being one of the two fuel pumps. It was hard to diagnose as I would test it cold and the one fuel pump was fine but after driving it, it would stall out after ten minutes when it was hot out. I would check your fuel pressure, and if normal, check again when the car IS CURRENTLY acting up!
Also, and more importantly, what code is CEL showing? Did the mechanic say?
Also, and more importantly, what code is CEL showing? Did the mechanic say?
Thread Starter
Member
Joined: Sep 2013
Posts: 78
Likes: 2
C240 4MATIC
When I read your subject, I thought CPS. But after the first paragraph, maybe a fuel delivery system issue? Do you have a fuel pressure gauge? If not, they are cheap. I have an Alfa Romeo that would do the same thing and ended up being one of the two fuel pumps. It was hard to diagnose as I would test it cold and the one fuel pump was fine but after driving it, it would stall out after ten minutes when it was hot out. I would check your fuel pressure, and if normal, check again when the car IS CURRENTLY acting up!
Also, and more importantly, what code is CEL showing? Did the mechanic say?
Also, and more importantly, what code is CEL showing? Did the mechanic say?
I thought it was the fuel too but I ruled that out because if I were to turn on the air which has nothing to do with the fuel pump, it would speed up the process of stalling. Like one time when I drove for a long distance, it wasn't really that hot out but my windows were getting foggy, I turned on the air so it can see again then eventually, the car stalled & stopped. I turned the air off & it did not stall again. The check engine light wouldn't stay on long enough to actually go & get it tested.
Junior Member
Joined: Dec 2010
Posts: 50
Likes: 2
From: Castle Rock, CO
2021 GLE AMG 63S, 2022 GLC, and 2013 ML350 4Matic
I think if you hook it up to a Mercedes Star diagnostic system they can look at historical codes. I would hate to say go to a dealership, but hopefully you can find a good independent mechanic who specializes in Mercedes. I say that, as those star systems aren't cheap and because of that, only a Benz mechanic would have one. Where do you live? People on this forum might know of a reputable mechanic in your area. I side with you; if your car is constantly stalling, something is wrong and accepting someone saying it is fine is not acceptable.
