It isn't advisable to do the injectors one by one as you should only remove the metal injector lines as a unit, never singly. That would mean you would have to bleed air out of the system four times, at best a lot of trouble for nothing.

It also really isn't necessary. If you want to assess which injector is making the most noise, with the car at idle you can take your 17mm wrench and (slowly, carefully) crack the metal injector line connection at each injector and see how the car sounds and runs when each is taken out of the equation.

Just for future reference, one of our forum members, Greazzer, cleans and rebuilds injectors at a very good price. Craigslist would not be my first choice for finding such stuff... these are the correct injectors for a non-turbo?

Can't offer advice on the blowby issue.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22