Same for your fuel filter. If your filter isn't letting enough fuel pass through, your engine isn't going to accelerate the way you need. Trouble starting your engine is another indicator that your fuel filter is clogged. If you've got a full tank of diesel and your engine won't start, there's a good chance your filter may need changing. Well, there ain’t no such thing as a “sealed transmission”. Mercedes came out with a service bulletin changing that nonsense when they started having a lot of tranny failures. But that was a while ago. Depending on when built and whether you use red or blue tranny fluid, the change interval is 39,000 miles (red) or 70,000 miles (blue). 1. Weak Battery. If your CLA250’s engine won’t crank or cranks very slowly, then the most likely culprit is weak or dead 12v battery. Investigating more closely and doing a battery voltage test will clarify whether the starting problem is due to the battery. A test can be done to measure the voltage between the battery poles, check the acid Usually under light steady throttle. It feels like the fuel is cut off for about a half second. Then you get a kick in the seat of your pants. Engine display on infotainment system shows hp and torque drop off and immediately start to build again. 11k on the odometer now. on November 17, 2016. Several months back my car was experiencing sputtering, weak acceleration (in the lower gears) and poor power and undesirable fuel economy. So I replaced the spark plugs and this helped for a few months and then recently the issue cropped again so I replaced the ignition coil and this helped marginally, the sputtering isn As the title suggests, I have a P0400 (along with two or three specific cylinder misfire codes) which is giving me a surging, rough idle and a lack of power at low RPMs. I replaced the plugs, cleaned the MAF and EGR valve and snaked the metal pipe to the rear of the engine, although this was not blocked as I've read about elsewhere. No improvement. richardkr. 33 posts · Joined 2010. #2 · Dec 20, 2010. Loss of power. Hello - Sorry I don't know the answer. Mine has a similar problem (03 sl55). In cold weather (my only experience so far) very sluggish engine response - about a 2 second delay before the engine increases RPM. Annoys people behind me at stop lights. In some cases, one of these hoses might tear, messing with the air-fuel ratio in your engine. As your engine loses power, your car struggles to accelerate even as you step on the gas. Oxygen Sensor Problems. A dirty oxygen sensor might be the reason why your car is struggling to accelerate and why your check engine light is on. 4 posts · Joined 2015. #1 · Nov 1, 2015. Hello, I purchased my CLA 250 4Matic a week ago and all features are to my liking except for the slow acceleration after stopping the car on stop signs or red lights. It takes the car 1 to 2 seconds to start moving at 20 miles per hour on local road. When the stop sign turns green, a car to the right Noise: Clicking while decelerating from 20 miles per hour to a complete stop. Cause: Worn carrier case-side gear bores. Noise: Rumble or clicking that gets worse during hard turns. Cause: Bad wheel bearings. Noise: Driveline squeaking or grinding at any speed. Cause: Worn or damaged U-joints. skdCO1.