P0100 code and rough running now no start
I would consider getting a second opinion. A compression and leakdown test will give you a good indication of whats going on.
Having said that, if it is indead a bent valve I would push to have you case manually reviewed by MB for warranty assistance with the repair, there are numerous cases of sticking valves which cause misfires but i've yet to hear of one bending. If you've had services done at the dealer then you have a good chance of getting something, if you've strayed then it's quite doubtful.
Keep us posted.
Last edited by one fast gto; Jan 14, 2009 at 09:43 PM.
Take it to an independent. Even if the dealer is right about what's wrong, you can get it fixed for FAR less by avoiding the evil dealer (yes, I called them evil, I hate car dealers that much because of my experiences. My MB has been to the local MB dealer twice. They have damaged my vehicle both times.)
Last edited by acr2001; Jan 14, 2009 at 10:24 PM.

A compression test will give immediate indication of a bent or stuck valve/valves. And you should hear it!
Last edited by Glyn M Ruck; Jan 14, 2009 at 11:17 PM.

Mark
The Best of Mercedes & AMG

I have been down this road, blew a hole in a piston, yet when the head was removed it was fine. My car hadn't suffered the carbon buildup and bent valves that others have - I'm still not sure what happened, yet blame the $12 hose and leaking cam sensors for not being able to diagnose it earlier, and the dealer misdiagnosing it several times.
Here's my advice:
TAKE IT TO AN INDEPENDENT.
It'll cost a few $$$ to tow it and have another shop look at it, yet it'll be worth it. I personally doubt the timing chain is stretched, and more likely the valve(s) stuck due to carbon buildup and bent.
If you cannot afford $4K in repairs, you should not be getting married.
Another couple adding to the debt crisis affecting us all... yet I digress.
Second advice:
Any used car will break, and parts like alternators/diff might be $500, yet transmissions can be $2K. If you didn't buy an extended warranty, you need to budget for these repairs.
Third advice:
If you cannot afford the repair, finance it. Low interest CC or LOC, or call the finance company and see if you can roll it into the financing of the car and extend the payment period.
Fourth advice:
Save the sob stories, no-one cares. That's harsh, yet you bought a used car without an extended warranty. The dealer didn't make any money off the sale/servicing, the finance company wants their money, ... so your pleas are going to fall on deaf ears.
Fifth advice:
Research your next car more. I would NEVER buy another M271. POS engine.
Last edited by one fast gto; Jan 15, 2009 at 12:21 PM.

Pulling the head is easy on this engine, 5 hrs. I put money on it being a bad head...

Don't query why they are doing this. It could be that they know something of the history of this car that you don't or that MBUSA have done a quiet deal with them but don't want it to be seen as a precedent. Don't concern yourself with this. Just take the deal.
Mark

Good news - I thought they were the dealer you bought from. Wow - they are being decent. - Go well






