Quote:
Originally posted by oldsouth
There is only one sensor downstream in the intake and I think it is just an overboost protection sensor. It cuts fuel when the boost is not right. I don't think it can tell anything about EGR.
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oldsouth,
Recently I have some power problems with my C250D. Every time I start the car it runs good, but as soon as I am driving social (low revs and at a constant mild speed), the car seems to get information to cut power. The car will continue running good, but needs more time to accelerate and the topspeed doesn't go beyond 175 km/h anymore.
I have changed every single electronic part of the engine and have been to the MB dealer to have the computer checked. Since this problem seems to be uncommon, the MB techs couldn't suggest how to solve this.
Anyway,
If the downstream sensor, you mention, is the sensor that is connected to the air intake pipe by a vacuum line...then this sensor does control the EGR! I have disconnected the sensor (replaced it with an other sensor, but without a good result) and my car is running well again (without any low power problems). I have been looking into the exact function of this sensor and found that it IS connected with the EGR and that it DOES control the EGR...
...just some information...greetingz,