A couple of weeks ago, I noticed my 2011 R350 Bluetec was having rougher starts. It got worse and worse. At the half tank, I decided that maybe it was bad fuel and filled up at my usual station. The starting instantly got better and better until a few days later, I was driving and lost power. I couldn't accelerate over 40 mph and the transmission was shifting very harshly. I pulled over, stopped the engine, restarted it and everything was back to normal except for the check engine light on the dash.
I called my MB dealer and they said they could not fit me in till next week, but since the car was driving normal, I could keep driving it. But that day on the way home (with my one year old in the car), I lost power again. I pulled over, stopped and re-started the engine then gingerly drove slowly home. Then had the car flat bedded to MB.
Dealer diagnosed it as bad fuel clogging the fuel filter. Replaced the fuel filter and delivered the car. I was unhappy to have paid $365 for the replacement fuel filter, but then thought it was better than a grenaded fuel pump like the VW TDI's have been getting from bad fuel.
Drove to work this morning with no problems (~28 miles). Took the back roads home and half way the engine stalled and I rolled to a stop on a 2 lane road with my kid in the car. Seriously not happy. I did only have 1/4 tank of fuel left, so I thought maybe I needed to fill up ASAP. Drove to the nearest diesel station and only stalled once on the way.... only
Filled up 16.8 gallons and I was on my way. Car seems better now... but with that Check Engine light staring back at me I'm wondering what do I do.
I guess I should send the car back to the dealer. Part of me wants to take a fuel sample or read the engine codes before I take it in, so I can have a record of what's going on. I've heard some bad horror stories on the tdi forums. My 2006 CDI gets serviced at my local mechanic. I had wanted to keep servicing the 2011 at the dealer until it was out of warranty. But now I'm worried that this going to turn into something where the dealer wants to replace the entire fuel system. Does that happen with the Bluetec engines?
2006 E320 CDI 115k miles, JL Audio, Dension GW500, Nokian Z (Summer), Nokian R2 (Winter)
2011 R350 Bluetec *traded in*
2013 GL450 46k miles