Mercedes CLA Forum banner

Sputtering

216 Views 9 Replies 4 Participants Last post by  Elsa
I'm having sputtering issues again! 馃槙 It happens when I accelerate, more so up hill. I've had this issue about every 2/3 yrs. I get the coils replaced, and that solves the problem for a bit. No one seems to know why this happens. Has anyone else had the issue with there benz? I have a 2014 cla45 amg. Thank you in advance for any help...
1 - 10 of 10 Posts
Ods are your injectors are causing the issue. With our motors it can be a reoccurring issue with the direct inject and clogging of the injectors due to fuel not being burned off and causing a foul on the plug. I tried a injector cleanse at a fancy euro shop and the problem persisted. Are you plugs pretty rough when you have had to have them swapped? You might try to swap those first and not the coils and see if that can gain you a temporary resolution for the sputtering engine. I always had to swap cylinder 1 and rarely cylinder 2 in order to resolve the issue but it was a temporary fix as the plug would foul in a matter of months again. Cylinder 1 is on the passenger side of the motor as you face it and it shouldn't take very long to swap just cylinder one. I swapped my injectors and haven't run into the issue yet. Hope this info helps you.
Thank you so much! I will definitely talk to my mechanic about this...
Hi, Injectors can be professionally cleaned, they give you a before and after flow test results so you can see if that was the problem before you even pay the bill. Plugs of course will foul up if engine not firing right so a check of those is first thing and dont cost much to replace.
  • Like
Reactions: 1
Ods are your injectors are causing the issue. With our motors it can be a reoccurring issue with the direct inject and clogging of the injectors due to fuel not being burned off and causing a foul on the plug. I tried a injector cleanse at a fancy euro shop and the problem persisted. Are you plugs pretty rough when you have had to have them swapped? You might try to swap those first and not the coils and see if that can gain you a temporary resolution for the sputtering engine. I always had to swap cylinder 1 and rarely cylinder 2 in order to resolve the issue but it was a temporary fix as the plug would foul in a matter of months again. Cylinder 1 is on the passenger side of the motor as you face it and it shouldn't take very long to swap just cylinder one. I swapped my injectors and haven't run into the issue yet. Hope this info helps you.
If it鈥檚 purely the injectors , then a bottle of redline S1 fuel system cleaner or lubri moly Jectron Will clean it up in one tank application.
I would run two consecutive treatments of the fuel system cleaner , to get the full effect of the cleaner.
I actually went through numerous different types of over the counter cleaners with little result. Eventually I had a professional injector cleaner kit that was recommended by my local indy shop and it only was a temporary solution. I had gone to Mercedes, and they can perform the said service but my local dealership did not have the tools necessary. I wish it did work cause in theory it sounded great and maybe for some with less carbon build up they might have success but, in my situation I was left with disappointing results. The dealership was actually going to be cheaper than the indy shop upon initial quoting until my service advisor realized they didn't have the equipment. Such is life. . .
Hi, Injectors can be professionally cleaned, they give you a before and after flow test results so you can see if that was the problem before you even pay the bill. Plugs of course will foul up if engine not firing right so a check of those is first thing and dont cost much to replace.
Great, thank you. Plugs? You mean spark plugs? Just checking..
yes the spark plugs will be fouled. You can always swap coils and check to see if the misfire follows the suppose bad coil to confirm its not the coil but the spark plug.
  • Like
Reactions: 1
When you install new plugs, make sure you go to the Mercedes parts dept to get them. For some reason , Mercedes spec their plugs slightly different from the oem ones you get from a third party vendor for the NGK.
  • Like
Reactions: 1
yes the spark plugs will be fouled. You can always swap coils and check to see if the misfire follows the suppose bad coil to confirm its not the coil but the spark plug.
Thank you..
1 - 10 of 10 Posts
Top