I messed around more with the car today - I had a good used set of injectors. Swapped them in. One wasn’t so good, as I had a lot of white smoke.

But otherwise they sounded marginally better.

https://youtu.be/3_APp2krSA4?si=fXD-051SnKdSFNeZ

But the “full of rocks” type sound, like rocks are bouncing around in there, still occurs at around 900-1400.

I’m tempted to swap IPs, but that’s a pretty big pain…

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)