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I'm new to this thread and would like to share with you the problem that I'm having wth the transmission of my 2006 W211E280CDI 7G Tronic and hope that you could help me solve this.
The car was bought recently and the seller was good enough to pinpoint that it would need 2 Fuel Pressure Rail Sensors changed as the Check Engine Light is on. Soon as I took the car home I had it scanned to make sure (the results I'm posting together with thread) and true enough the scanned said that Fuel Rail Pressure's signal voltage is low (and there are some other codes which I believe is not connected with the transmission but you be the judge). So, instead of changing the Fuel Pressure Sensors, I changed first the Fuel Filter to see if this will do the job. Sure enough, the check engine light is gone and hasn't been back for 3 weeks now.
The car would drive brilliantly for 40 minutes and then after this, this is where there car's transmission plays up. When shifitng from 2 to 3 and 4 and so on, it would first rev up before the car would settle for the right gear. And at traffic light you would notice a sort of a misfire (it would only do this once). Now, I had the transmission oil changed, with the new filter and gasket and 5 litters of oil. And once I drive it, it goes brilliantly with the shifting seamlessly. Until...30 - 40 minutes later, it would start with the same problem.
Other things: When I get home (with experiencing) the transmissionproblem and turn the key off there would be a slight gruff(??) or rough before it completely turns off. But,,,when I have been driving within the span of the 20 - 30 minutes without having any transmission issue, and turn the key off, the car would turn off "smoothly".
I've been thinking that the Fuel Pressure Rail Sensor is the culprit, after all. But my question is, why is the Check Engine Light gone now once I changed the Fuel Filter? And, if it is the transmission's fault (transmission valve, etc.), why has the Scan tool didn't throw any code at all, in this regard?
Please, any thoughts on this is most welcome. Thank you in advance!
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