Join Date: Oct 2016
Location: Virginia Beach, VA
Vehicle: 2000 SLK230 Bahama Blue
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Thanked 1 Time in 1 Post
Engine cutting out need diagnostic help! Can send beer money!
I am in need of some help. I recently had an ECU that I got off of ebay for 80 bucks unlocked by Beckmann Technologies in North Carolina due to my ECU being bad. I then took it to a Mercedes dealer and had it reprogrammed, and now my car runs again. Yay! Since the reprogram, I have driven about 120 miles.
I want to explain the whole situation so that all the variables can be accounted for. When I removed the ECU I bent a pin in the ASR module and now I have and ASR/BAS light on. (I think this is completely unrelated to the engine issues, but I don't know.)
When I turn the car on, the fan runs on high all the time. When driving the car, it will accelerate regularly if the throttle is held below 1/4 position. Anymore and it surges violently, like the whole engine is cutting out intermittently. If I keep it at 1/4 though while driving and allow the rpms to slowly rise, they will, but then the car will not allow rpms over approximately 4300 when it starts violently cutting out again. Out of gear (I have a 5spd) regardless of throttle position, I can rev the engine up smoothly and quickly, but it is still limited to 4300 rpms.
Before the ECU was fixed, the car sat for over a month. I have pulled the K40 relay before and I could tell it had been repaired before. So, I have ordered an ASR module, a K40 relay, and a new MAF sensor in order to attempt to remedy this. I have also tried the ECU soft rest procedures, but it still has problems. Also, as I drive it more, it surges ever so slightly less as it revs up while driving, but still anything over 1/4 throttle , or at 4300 rpms the car starts surging violently.
I'm kind of thinking that it is in some sort of fail safe mode (if that exists) which is why the fan blows high and the rpms and fuel flow are all very limited.
If you can help diagnose this and it works, I will send you beer money via paypal. THANKS!