hi, I have a 99 E300D ,so far this yr replaced fuel ,lines o-rings, glowplugs, rear bearings(pita)
thanks to all the helpful posters! Now to the problem I created , ran some diesel purge thanks to helpful pictures in forum did wonders , but still had a small bit of nailing at idle , so pulled injectors took to shop only to find out everythings perfect with them and the shop didnt charge me which was nice!(kinda was hoping for one bad one to cure noise at idle) well went to dealer picked up some seal rings to install injectors back , did this started it and loud now thought ok air in system give it the old italian tune up on highway will clear this up, it didnt now ,at idle its loud ,what could i have done wrong it has power just idling nailing or knocking sound like truck ! any help would be greatly appreciated

Hot or cold noisy idle problem?? My 240D sounds like a Vickers WWI machine gun when cold. Nailing disapears when it warms up.

Did you get the seats for the injectors out the way you should?

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01 Ford Excursion Powerstroke
99 E300 Turbodiesel
91 Vette with 383 motor
05 Polaris Sportsman 800 EFI
06 Polaris Sportsman 500 EFI
03 SeaDoo GTX SC Red
03 SeaDoo GTX SC Yellow
04 Tailgator 21 ft Toy Hauler
11 Harley Davidson 883 SuperLow

the seal rings came out easy just put magnetic reach out they came bought new ones and dropped them in ,made sure they were facing proper way!

can injectors test good and still have a problem ,has anybody had this occur ????????

I have mentioned before how sensitive the fuel system appears to be on these cars. My guess is that you introduced a fuel or compression leak during the installation of your injectors. You may want to pop the injector cover off and inspect for fuel leaks. If you fill the injector holes with water you can also see if you have any compression leaks (you'll see bubbles around the injector that's leaking compression). The injectors do need quite a bit of torque to seat properly.

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2004 VW Jetta TDI (manual)

Past MB's: '96 E300D, '83 240D, '82 300D, '87 300D, '87 420SEL

Those injectors have to be tight, real tight.

BenzDiesel