I did my 606 injectors about 18 months ago--Noisy as heck right afterword, but after they seated, it was back to quiet again--about a 1000 miles. StarTron http://www.westmarine.com/webapp/wcs/stores/servlet/producte/10001/-1/10001/141700/377%20710/0/startron/Primary%20Search/mode%20matchallpartial/0/0?N=377%20710&Ne=0&Ntt=startron&Ntk=Primary%20Search&Ntx=mode%20matchallpartial&Nao=0&Ns=0&keyword=startron&isLTokenURL=true&storeNum=6&subdeptNum=169&classNum=764will do wonders for quiet operation, my E300D is virtually gas like in its smoothness and quiet operation. I get the idle degradation after the afterglow ceases and before the head really warms up in cold weather.--Dumb question, but did you torque the new injectors in and replace the heat shields? if one doesn't do this exactly, it will affect the pop off pressure and in turn vary the between cylinder timing.

Also, I boiled my intake and cleaned all the ports. I pulled the intake to do a glow plug and found 7 of the 12 tubes more than 2/3 blocked with oil soot from the EGR. I cleaned all 12 ports and boiled the intake and cleaned both of the resignation dampeners mounted in the intake

WOW, I now understand why they thought the 606 without a turbo was amply peppy. It is, when everything is clean and functional!

__________________
Mark
========
THE WHITE FLEET
2016 GLE300d 4-MATIC 38K BROWN!
2012 S350 Bluetec==94k WHITE

2007 ML320 CDI==166K WHITE (FOR SALE)

Under new management:
2005 E320 CDI--140K--WHITE
1995 E300-Diesel-133.5K--THE CAR IS BLUE
1986 300SL--97.5K (European) AND WHITE. Back in Europe!
1991 190E 2.3-73K California Perfect.--WHITE
1995 E320-Wagon-159K--WHITE (recently scrapped)
1987 300D Turbo-213K--WHITE
1987 190D 2.5 Turbo-288K--WHITE