Weak acceleration (semi limp mode?) On my mercedes c class w204 c250 2008

[fini]

Hi there, I recently bought a w204 c250 2008 from Austria. All was good in the beginning, but after a whil i started to notice some problems with the acceleration.. after a while (5-10 min) the car goes into a limp mode, I m full throttle in 2nd gear and the speed barely increases..
I runned out of ideas of what could it be.. I took the car to multiple mecanics(includin mercedes) but no one could figure out why.
I changed all the filters when I bought it, The DPF is at 9%...
Plase if someone cand help me with any ideas on what it could be will be perfect.

 

[mersum1es]

If it does not rev over 3000 and changes gears reluctant, it is in a limp, and code is triggered. Only rarely MAF fault is not triggering a code. Mercedes dealer has best tools for that, indy's tools may or may not find all codes. Otherwise, some parameter prevents full acceleration/power. Parameter reading can be real, or faulty but not so badly car diagnosis would think it is implausible.

Recently I have read several cases where car has been remapped (badly) and fault codes are prevented because of sh**ty code. You dealer could 'update' software and they should have knowledge to dig the fault.

 

[supernoodle]

If you're being torque limited without an error it's possible a sensor is giving a spurious but in range value. Torque can be limited based on a smoke limit (air/fuel ratio calc), temperatures or pressure. Many sensors will be plausability checked though. A high fuel temp reading can severely restrict torque. At high fuel temps HP pump capability is severly reduced, so torque gets cut in an attempt to reduce temps. That wouldn't be seen an error. If the temp was permanently high though, that would fail a plausability check.
You say it only becomes restricted after a time. That gives you the ability to log as much data as you can and see what's changing when it becomes restricted. You'll no doubt need Xentry to log any useful data. The likes of the icarsoft are pretty poor for that.

 

[fini]

If it does not rev over 3000 and changes gears reluctant, it is in a limp, and code is triggered. Only rarely MAF fault is not triggering a code. Mercedes dealer has best tools for that, indy's tools may or may not find all codes. Otherwise, some parameter prevents full acceleration/power. Parameter reading can be real, or faulty but not so badly car diagnosis would think it is implausible.

Recently I have read several cases where car has been remapped (badly) and fault codes are prevented because of sh**ty code. You dealer could 'update' software and they should have knowledge to dig the fault.

Hi, thanks for the answer, the weird thing is that the revs go well over 5000, the thing is it does not accelerate as it should.. judging by the way it accelerats you would say it has 50hp, not 204hp..