FYI, Diesel Purge making the sound go away would tell you essentially nothing anyway. It could still be fuel related, bad compression, or any number of other problems and doesn't automatically point to any of them.

I would say the sound staying even when using a quiet fuel (DP, canola) is much more useful information to have, actually.

-Rog

Wait, Canola will allow it to run quieter? Fill me in.

__________________
1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.

Well, just as long as the canola is in the fuel. Diesel Purge is the same, the engine runs quiet while you've got it running through and people think it's fixed something but then the noise returns more often than not. Both are quieter because they burn easy, I guess.

The first time I dumped some old (but unused) cooking oil in my tank I thought the engine died when I was idling through a parking lot it was so quiet.

-Rog

It runs better off of diesel purge because of the higher levels of cetane than fuel. It's a more complete combustion and can mask bad injectors, or other related issues to fuel. It's great for diagnosing fuel issues. I'm not sure why oil combats better and makes the engine quieter. I'd assume lubricity properties.

@ the OP. Why did You remove the injector lines and not crack them just a quarter turn? Also, your next step should be to do the valve adjustment with feeler gauges.

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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

Yes, but because it burns so well it also gives you the same "fix" if you have bad compression, incorrect timing, et cetera. So if it runs quieter no matter which you have I don't see how it's automatically a fuel problem. It could be any of those.

-Rog

I've never seen it correct compression. if compression is bad enough the purge wont mask it. Same with timing. It's mainly used to mask poor nozzles. I only say that cause I did it on my 92 300d before I swapped it and it didn't mask the low cylinder compression misfiring.

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

Mainly because I have no idea what I'm doing. I pulled the injector lines off all the way, which made me realize I need new lines. Going today to pick some up.

If I wanted to adjust the valves in the next day or two, are there any stores that sell the adjustment wrench or do I pretty much need to look online and wait for shipping?

Order them online. Why do you say you need new lines? Are you talking about the metal hardlines? If you aren't sure of what you're doing, before you do anything, ask questions! Before you break or make a big mistake that could cost you the engine. Before you do tbe adjustment, do consult.

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

I think the flame front is more gentle or slower. Reducing combustion noise to some extent. Just what I think. Not proven.