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Originally Posted by Oracle12345
you are experiencing the difference between a gas and diesel vehicle. A diesel vehicle will offer much better low end torque because of the design of the engine, the chemical structure of diesel. A gas engine is only 20-25% efficent and a diesel is 50% efficent in terms of combustion.
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The performance numbers for the 300SD and 300E should absolutely not match as mine do. Of course the diesel will have more low end torque but the gas engine should leave the diesel in its dust in a drag. My cars are about the same performance level...not good. I've driven a number of gas vehicles, not new to them...just new to this car.
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As for the fuel mileage problem sounds lambda needs to be adjusted, fuel injectors to be checked. A common place for those to leak oil is on the right side of the motor at the front because of the head gasket design. I would do a compression test and cylinder leak down test to see the health of the motor. do you know how to do a cylinder leak down test?
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I agree I need to do some diagnostic work to fiddle with the AFR and fuel injection system. I noticed today that when I rev it in neutral a bit and let off the gas, it comes VERY close to stalling, which would indicate running a bit rich (in my past experience at least). Fuel pump is pretty loud too...crawled under there while the car was running to check it and for exhaust leaks. Cat-back is all like new, definitely replaced but with OEM pieces ($$$). All that I've got left to do is really to start picking this thing apart and check all of the sensors. Will update this thread as I do it.
Thank you for all your input!!
Edit: the line about the fuel pump was supposed to be accompanied by this bit--tried to get the fuel filter off but damn those nuts were STUCK. Had a tough time getting leverage but still....Blasted it with PB, letting it soak a bit then I'll get at it again tomorrow. Looks like the filter hasn't been changed in forever so that'll be a good thing to do for sure.