Interesting. According to the PO's service records it failed with 26% a couple of years ago. He did a valve adjustment, new air filter, diesel purge, and "Italian tune up" then went thru again with bio-diesel in the tank and it passed with about 5%.

When I bought it as I said I went thru immediately and it passed with 3.1%.
I subsequently fixed the air cleaner mounting issue and cleaned a heck of a lot of congealed oil and gunk out of the filter housing, put in a new air filter and fixed the pipe that goes from top of the manifold to the air filter housing. I've not done a valve adjustment yet but I guess probably the new filter along with cleaning it up a bit and running it hard right before this test got it down to such a low percentage.

I looked at the printout again and I see that it's an opacity reading, not "Particulate" specifically. Glad about that I am. I'm pretty sure its due for a vale adjustment so I'll be getting around to that one of these days soon I think.

- Peter.

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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S