OM606 ('99E300TD @ 215K) LOUD AS HELL WHEN IDLE - PeachParts Mercedes-Benz Forum

max606 · #1 12-01-2022, 01:02 AM

Got a 1999 e300TD at 215k. Had the car for 4 years now, love it to death but when its idling the car is ridiculously loud. Also, when coming to a stop, the motor sounds like its choking/skipping before returning back to idle. I've been told that the fuel injectors need cleaning and I've also read something about air leaks but I wanted to see if i can get any more guidance on the matter. Thanks

jake12tech · #2 12-01-2022, 03:03 PM

Time for an injector rebuild. Not a cleaning but a rebalance and new nozzles from certified shop. Only use bosio or firads. Not Bosch India nozzles.

max606 · #3 12-01-2022, 05:55 PM

I appreciate you getting back to me so quickly.
You suggest that I jump right into the rebuild, would there any benefit to cleaning them first? My tech tells me I should start with a proper cleaning.

MB140300SD · #4 12-01-2022, 11:02 PM

Mine also seems to be doing this, the stumbling when returning to idle. I also at certain outdoor temps with the car in park and AC not running, it seems to have a miss. I just recently rebuilt my nozzles with Firad nozzles and it was loud at idle, but has since quieted down some. Still a little louder that I would like. Previous to this, I did replace all of the delivery valve seals, clear fuel lines, o rings etc. At some point I am going to go back and recheck to make sure I have the DV torqued correctly just to rule that out. I can't imagine I would have messed it up as I have done many sets of these.

treetops · #5 12-02-2022, 10:45 AM

x2 on injector rebuild. Mine does the same at 272K. You could run a diesel purge direct to the filter and it will probably run much better/quieter for a time, but it won't last very long (my experience anyway). There are Utube vids on the DP to filter setup.

jake12tech · #6 12-02-2022, 11:48 AM

Quote:

Originally Posted by max606

I appreciate you getting back to me so quickly.
You suggest that I jump right into the rebuild, would there any benefit to cleaning them first? My tech tells me I should start with a proper cleaning.

Yes I’d highly recommend an injector rebuild. An injector cleaning won’t do a whole lot for a long period of time as treetops mentioned. The MB recommendation is really every 100k have the injectors rebuilt. It doesn’t mean they won’t go longer than a 100k, but the spray pattern won’t be the same and within spec.

jake12tech · #7 12-02-2022, 11:49 AM

Quote:

Originally Posted by MB140300SD

Mine also seems to be doing this, the stumbling when returning to idle. I also at certain outdoor temps with the car in park and AC not running, it seems to have a miss. I just recently rebuilt my nozzles with Firad nozzles and it was loud at idle, but has since quieted down some. Still a little louder that I would like. Previous to this, I did replace all of the delivery valve seals, clear fuel lines, o rings etc. At some point I am going to go back and recheck to make sure I have the DV torqued correctly just to rule that out. I can't imagine I would have messed it up as I have done many sets of these.

Funny I had The same gig going on with my 427k car. I re-replaced all the fuel lines (plastic) and it went away. One o ring must’ve had a slight tear allowing in a little bit of air. The 606 fuel system is the most delicate and sensitive fuel system I’ve ever dealt with in my endeavor of diesels.