Quote:
Originally Posted by Rogviler
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
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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