So ;
My W123 Coupe has been loping worse and worse at hot idle and smoking (excess fuel) again too 
.
.I drove it to the show shine this morning then home where I did a hot valve adjustment, a thing I don't normally like to do but Mercedes says when you're fighting with problems or the Customer is waiting, it's O.K. to do a hot valve adjustment, just open the valve gaps to .006" intake and .016" exhaust .
Driving home it struggled to reach 105 MPH and never really reached full 82*C operating temp but was plenty hot when I popped the hood so onwards .
Several valves were tighter than cold spec., none were zero lash so that's good .
I carefully adjusted them as necessary then changed the secondary, spin on fuel filter ~ it wasn't filthy inside but rubbing the inside of the filter housing with a clean white napkin resulted in lots of super fine dead black stuff .
The added on micronic paper element filter in the fuel return line was a bit dirty but not like it has been every fillup when I normally change it so possibly I'm nearing the end of this bad fuel problem (possibly) .
I changed it just to be safe .
Then I rigged up a gallon jug of silver bottle Power Service Diesel Kleen to work as a traveling Diesel Purge, adjusted the park brake on Tom's '87 W126 300SDL , cleaned up and headed off, my mangled hand killing me but prolly better for the flexation I gave it working .
I ran out of fuel in South Central Los Angeles (oops) coasted off the freeway and onto a small side street where I wasn't worried about getting hit by passing cars and removed the now empty purge jug, carelssly swapping the fuel feed lines feed for return and so after 400 + strokes of the primer pump and two failed attempts to start the engine, I reversed the feed hoses and added the spare two gallons of fuel I carry in the trunk, pumped the primer 200 MORE times and after a lot of cranking it lit off, belched a large cloud of brownish fuel smoke *just* as the sun was setting .
Whew .
Boy howdy does my hand hurt 
.
.I know everyone is deathly afraid of South Central L.A. and yes, it's a dangerous place but no one bothered me at all .
The car still lopes a bit at hot idle and smokes from over fueling but is noticeably peppier to throttle response and shifts smoother too .
At this point I'm sure I got screwed by the guy in NC who first lied to then outright cheated me, on the 'rebuilt' injectors I recently bought and installed ~ when I test them I'm willing to bet money they'll all pop off at too low a pressure 
.
.Oh well, live and learn .
Except of course, I never learn ~ I trust people to do what they say they're going to do .
When I ran out of the purge fuel the newly installed paper fuel filter was perfectly clean so I'm guessing the remaining crud is in the tank, a job I hate to even think about in my current health state but I may be forced to remove and clean it properly at home if I see more serious crud in the clear paper return filter .
Stay tuned ~ my plan is to run it close to empty Monday when I return to the Doctor's for more pain filled O.T. fun with my hand, then fill the tank (and the trunk spare can !) with PeroPel biomass Diesel .
-Nate
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Posted by: Nate <vwnate1@yahoo.com>
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