R320 Bluetec- miss above idle, no power, but NO CODES! - Page 2 - PeachParts Mercedes-Benz Forum

engatwork · #16 03-28-2020, 07:37 AM

Thanks for link Greg.

ROLLGUY · #17 03-28-2020, 11:39 AM

Quote:

Originally Posted by GregMN

https://www.youtube.com/watch?v=xjSWLq7OvHE

I set up the test in the video with longer tubes ( about 8" ) and ran the engine until one of the tubes was over half full. The tubes that filled up more than the others were the bad injectors.

Thanks, I watched the video, and that seems like a pretty easy and valuable test. The video being an inline 5, how different would the V6 be? I imagine the longer tubes are so the engine can be ran, rather than just cranking. It would seem to be more accurate, as it would acquire a larger sample.

ROLLGUY · #18 03-28-2020, 11:44 AM

Quote:

Originally Posted by DDAY

I have had a lot of experience with an engine problem and there were no codes. Local shop has the latest and best analytical equipment but no codes, dealer also found no codes, dealer appealed to the factory for help but found no solution. Entire problem from beginning to end took about a year and cost me over $5,000. Could have been much higher except dealer did a lot of experimenting for free. I posted the entire story on this site. The only things in common with your problem are same engine and no codes. I finally installed a new cheapie starter because I thought maybe it was cranking a little slow and to replace the starter I had to remove a portion of the exhaust system including that "large tank". There were three wires leading to the exhaust system that I had to unplug and then reconnect after the starter was replaced and the exhaust system re-assempled. The car now performs perfectly. I suspect one of those three wires that I unplugged and then connected again was the culprit. No codes.

Interesting. I will check all the connections. I don't think any plugs are disconnected, but they may not have a good connection (same result as being disconnected). However, I have a hard time believing that there is no codes if a connector is not connected, especially one related to an emission control device.

GregMN · #19 03-28-2020, 01:18 PM

Quote:

Originally Posted by ROLLGUY

Thanks, I watched the video, and that seems like a pretty easy and valuable test. The video being an inline 5, how different would the V6 be?

I did that test on my ML 642. That was awhile ago. But if I did it, it cannot be that hard to do....
I started the engine and ran at idle and watched the tubes fill. As I remember they fill slowly and you have plenty of time. They should all fill at about the same rate.

There are other videos of the test being done on a running engine. https://www.youtube.com/results?search_query=diesel+injector+leak+off+test