mercedes13156
Senior Member
- Joined
- Dec 27, 2005
- Messages
- 1,267
- Reaction score
- 211
- Location
- West Lothian
- Your Mercedes
- CLK 200 Cabrio and a Ford Kuga
Hi Folks,
I serviced my wife's A170 CDI last week. all went well and it passed its MoT. The problem is that over the last week the performance has been all over the place. I noticed first that it restricted itself to 3000 rpm in all gears, but only when it was warm. It went like it should when it was cold. Then it started off OK and lost performance to 3000 rpm over a 15 minute period. This morning it was restricted when it was cold and OK when it was warm. I stopped the engine for 30 seconds, started it up and away it went, almost back to normal.
What have I done to it? Filters were purchased at my local parts supplier and fitted perfectly. Oil was fully synthetic as the book. However, I couldn't get the hatch open to get the old air filter out, so I had to loosen the top cover and refit it. At that point I noticed the aluminium housing with the black plastic top and black pipe on the right of the air cleaner housing was full of black oily muck. I wiped out the worst of it with paper towels and gave it a spray with some methylated spirit to loosen the muck that was left. The sensor, or whatever it is was absolutely coated with this stuff and it has come up reasonably clean. (What exactly is it anyway? Is it the MAFS?). The inside of the air cleaner box was not coated with this muck and neither was the inside of the old air filter. It all went back together OK with nothing left over. The engine starts first time, idles well at the right revs and is nice and smooth to drive. Except that the performance is erratic. It feels like it's in limp home mode. Anyone have any clues?
I serviced my wife's A170 CDI last week. all went well and it passed its MoT. The problem is that over the last week the performance has been all over the place. I noticed first that it restricted itself to 3000 rpm in all gears, but only when it was warm. It went like it should when it was cold. Then it started off OK and lost performance to 3000 rpm over a 15 minute period. This morning it was restricted when it was cold and OK when it was warm. I stopped the engine for 30 seconds, started it up and away it went, almost back to normal.
What have I done to it? Filters were purchased at my local parts supplier and fitted perfectly. Oil was fully synthetic as the book. However, I couldn't get the hatch open to get the old air filter out, so I had to loosen the top cover and refit it. At that point I noticed the aluminium housing with the black plastic top and black pipe on the right of the air cleaner housing was full of black oily muck. I wiped out the worst of it with paper towels and gave it a spray with some methylated spirit to loosen the muck that was left. The sensor, or whatever it is was absolutely coated with this stuff and it has come up reasonably clean. (What exactly is it anyway? Is it the MAFS?). The inside of the air cleaner box was not coated with this muck and neither was the inside of the old air filter. It all went back together OK with nothing left over. The engine starts first time, idles well at the right revs and is nice and smooth to drive. Except that the performance is erratic. It feels like it's in limp home mode. Anyone have any clues?
