Engine running poorly - m271
Thread Starter
Newbie
Joined: Jul 2024
Posts: 6
Likes: 0
CLK w209
Engine running poorly - m271
Hello everyone,
I've been dealing with an ongoing issue with my 200 Kompressor M271 (163hp) for the past seven years, and despite spending what feels like thousands of dollars, I still haven't pinpointed the problem. The car has a rough idle and frequently shuts off one cylinder. It drives fine, but as soon as I put it in neutral (it's a manual), one of the cylinders stops working, and the engine runs poorly on just three cylinders. Turning the car off and back on seems to temporarily fix the issue.I've replaced the spark plugs at least five times, installed new coils multiple times, swapped out the MAP sensor, MAF sensor, and cleaned the throttle body. A mechanic checked the live stats and confirmed the throttle body is working normally. I've also replaced both O2 sensors, which was quite expensive, but the problem persists.
I've consulted at least 7-8 different mechanics, but none have found the root cause, often suggesting numerous potential reasons.I'm starting to suspect it might be the crankshaft or camshaft, though I haven't replaced them yet. The car starts without hesitation, so I'm unsure. If anyone has any recommendations or advice, I would greatly appreciate it.
Thank you!
I've been dealing with an ongoing issue with my 200 Kompressor M271 (163hp) for the past seven years, and despite spending what feels like thousands of dollars, I still haven't pinpointed the problem. The car has a rough idle and frequently shuts off one cylinder. It drives fine, but as soon as I put it in neutral (it's a manual), one of the cylinders stops working, and the engine runs poorly on just three cylinders. Turning the car off and back on seems to temporarily fix the issue.I've replaced the spark plugs at least five times, installed new coils multiple times, swapped out the MAP sensor, MAF sensor, and cleaned the throttle body. A mechanic checked the live stats and confirmed the throttle body is working normally. I've also replaced both O2 sensors, which was quite expensive, but the problem persists.
I've consulted at least 7-8 different mechanics, but none have found the root cause, often suggesting numerous potential reasons.I'm starting to suspect it might be the crankshaft or camshaft, though I haven't replaced them yet. The car starts without hesitation, so I'm unsure. If anyone has any recommendations or advice, I would greatly appreciate it.
Thank you!
Member
Joined: Dec 2023
Posts: 217
Likes: 74
From: TN
2013 w204 c250 coupe & 2001 Dodge Ram 2500 24v Cummins
Hello everyone,
I've been dealing with an ongoing issue with my 200 Kompressor M271 (163hp) for the past seven years, and despite spending what feels like thousands of dollars, I still haven't pinpointed the problem. The car has a rough idle and frequently shuts off one cylinder. It drives fine, but as soon as I put it in neutral (it's a manual), one of the cylinders stops working, and the engine runs poorly on just three cylinders. Turning the car off and back on seems to temporarily fix the issue.I've replaced the spark plugs at least five times, installed new coils multiple times, swapped out the MAP sensor, MAF sensor, and cleaned the throttle body. A mechanic checked the live stats and confirmed the throttle body is working normally. I've also replaced both O2 sensors, which was quite expensive, but the problem persists.
I've consulted at least 7-8 different mechanics, but none have found the root cause, often suggesting numerous potential reasons.I'm starting to suspect it might be the crankshaft or camshaft, though I haven't replaced them yet. The car starts without hesitation, so I'm unsure. If anyone has any recommendations or advice, I would greatly appreciate it.
Thank you!
I've been dealing with an ongoing issue with my 200 Kompressor M271 (163hp) for the past seven years, and despite spending what feels like thousands of dollars, I still haven't pinpointed the problem. The car has a rough idle and frequently shuts off one cylinder. It drives fine, but as soon as I put it in neutral (it's a manual), one of the cylinders stops working, and the engine runs poorly on just three cylinders. Turning the car off and back on seems to temporarily fix the issue.I've replaced the spark plugs at least five times, installed new coils multiple times, swapped out the MAP sensor, MAF sensor, and cleaned the throttle body. A mechanic checked the live stats and confirmed the throttle body is working normally. I've also replaced both O2 sensors, which was quite expensive, but the problem persists.
I've consulted at least 7-8 different mechanics, but none have found the root cause, often suggesting numerous potential reasons.I'm starting to suspect it might be the crankshaft or camshaft, though I haven't replaced them yet. The car starts without hesitation, so I'm unsure. If anyone has any recommendations or advice, I would greatly appreciate it.
Thank you!
i would do a compression test on each cylinder as previously suggested by @TimC300. That will narrow down to the exact cylinder and you can see how they all compare in compression.
Have you double checked all your hoses, vacuum lines, electrical connections etc??
ant
.
Thread Starter
Newbie
Joined: Jul 2024
Posts: 6
Likes: 0
CLK w209
So, it was storing faulty codes for misfire in cylinders 2 and 4. Then I bought new coils and changed them. After driving a couple of miles, while waiting at a traffic light, the car went into limp mode. I know it's working on 3 cylinders because it's very rough and the whole car is vibrating. However, after turning it off and starting the car again, it's fine until the next traffic light or stop. Went to my mechanic and we saw that it's giving cylinder 4 misfire again.
Thread Starter
Newbie
Joined: Jul 2024
Posts: 6
Likes: 0
CLK w209
Hey @Pwrfmind , are you getting a CEL or any codes ? I am not sure if the spark plugs need to be clocked a certain way on the m271. I replaced mine on the m271evo and never had an issue.
i would do a compression test on each cylinder as previously suggested by @TimC300. That will narrow down to the exact cylinder and you can see how they all compare in compression.
Have you double checked all your hoses, vacuum lines, electrical connections etc??
ant
.
i would do a compression test on each cylinder as previously suggested by @TimC300. That will narrow down to the exact cylinder and you can see how they all compare in compression.
Have you double checked all your hoses, vacuum lines, electrical connections etc??
ant
.
