A clogged catalyst can cause a performance loss. Taking it out on the interstate and flogging it as well as holding it to the floor from a dead stop up to a safe mph can help blow / burn the soot out of the catalyst. Some refer to this as an Italian tuneup!

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Turbo300Mercede
87 300D W124
83 240D W123
80 300 TD Wagon W123, 4 Speed from 79 240D, SLS Rear Suspension

I think it is something stupid like that. I have to check timing next. I did a couple Italian tuneups and it seemed to help a bit. After I plan to check the crossover pipe and see how terrible that looks too.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

I checked the transmission fluid and it is CLEAR. What's up with that? Change and filter I think is on the way.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

Try blocking off the EGR valve, or at least check its operation. My first MB was a 123.190 (non-turbo wagon, OM617 motor) was an absolute dog with lots of white smoke that smelled of diesel and it could barely go 50 mph. I tried everything I could think of: new filters for air and fuel, set the valves and set them again, replaced all the injectors. Engine ran smoothly with no missing, just miserable power and too much smoke. Finally I blocked off the EGR, and I instantly had a new car. Top speed (only explored once) was an indicated 110 mph. I was SOOO happy! The EGR had failed in the full open position, effectively choking the engine on its own exhaust and cutting off most of the oxygen.

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Respectfully,
/s/
M. Dillon
'87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted
'95 124.131 (E300) "Sapphire", 380k miles
'73 Balboa 20 "Sanctification"
Charleston SC

???

CLEAR???

how odd.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!