BenzWorld Junior Member
Date registered: May 2010
Vehicle: Mercedes ML 270 CDI
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2003 ML270 CDI Wont Start...Help!
Was hoping somebody may be able to help me. I've searched the forum and found a few topics similar, but none have answered the problem I have specifically, so here goes....
About September time, I had my ML270 CDI serviced by a friend who is a mechanic. All seemed to go well until it came to fitting the fuel filter. Once that was fitted, the car just simply didn't want to start up. We cranked it until the battery went flat, and then some. Still no joy.
Out of despair and the fact it was getting late and dark and I needed to get home, the guy resorted to using a short puff of "EasyStart" to fire up the engine. A few cranks later and I was up and running. But for me, I was worried that it masked the problem, rather than fixed it. However, I got home just fine. Next day when I went to start the car, it fired up ok...but it took about 3-4 turns of the engine to get it to fire whereas pre-service, it would start flawlessly everytime on the first turn. I was concerned, but so long as it started and did so on a single turn of the key, I assumed all was fine.
However, in the last month (with the cold spell we have had here in the UK as low as -12 degrees Celsius), it has let me down a few times, but I put this down to the cold weather and decided to not try cranking it too much, so as not to do any damage. As soon as milder weather returned, the car would start...but i noticed that it took 3-4 turns of the key to get it started.
Now, if i leave it for a few hours the car simply will not start. It's got a brand new battery and cranks really well, but just wont fire up once it's been left for a while. Yet, if I get it started (I have resorted to EasyStart just once to test my theory), once its been running, it will fire up again within a few hours without a problem. It only seems to be doing it if left for long periods. The temperature outside is now 8 degrees Celsius, so I'm pretty sure it's not cold weather causing it.
I've been given a few possible causes already from a few mechanics that I know personally.....but I suspect they are just guessing, rather than making informed decisions.
The theories I've been given are:
1. Air leak in the fuel system
2. Crank sensor
4. Faulty injectors
So the question is, how can I restore my faith in my ML and get it back to its usually reliable self?
Any help would be greatly appreciated! (and sorry for the long post, but I always believe the more information you have, the better the advice can be given).