Hi,

I have a rough idle, and i started by checking each injector, so i loosened the nut at the injector, on each one, to see what it does.

Well, i figured that number 3 doesn`t care when i loosen the nut for it, so, i tought, it must be that one, so i replaced the nozzle on it, put a new heat shield, and so on.

Surprise, same problem afterwards. The injector still doesn`t seem to work...

Filters are new, the inline, and the metal one...

Can you guys point me on the right path ? Cause i don`t know anymore

Thanks

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Portland, Oregon

1986 300 SDL, 1993 300SD, 1986 300SE, 1994 S350D, 2002 S500, 2008 ML320CDI

You did not say what the origional problem you were looking for was; or or if that problem started after you did some work. It would be helpful to know.

Going by the information you have give so far:
Try Swapping the suspected Injector to another Cylinder far from the origional Cylinder you pulled it from. (During the swap look and see if the Ball Pin/s inside the pre-chamber/s is still in good cindition.)
If the problem does not follow the suspect Injector you swapped from the suspect Cylinder you have a problem inside the origional problem cylinder.

Cylinder problems (after you have looked at that Ball Pin) can be checked with a Compression Tester. Harbor Freight sells one for around $35; less if you catch it on sale or they send a % off coupon. Make sure it will fit your Engine.

If the problem followed the suspect Injector when moved to the other Cylinder; you still have a problem with that Injector.

Are any of your Fuel Injection Pump Delivery Valve Holders seeping/leaking fuel?

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84 300D, 82 Volvo 244Gl Diesel

I have to ask the usuall 350 questions... Does your car burn oil? Does it smoke? Did the loping idle develop over time?

Send your injectors out to be pop tested (or build a pop tester yourself). Simply replacing the nozzles can help, but I guarantee they won't be balanced. Getting the nozzles set up correctly is money well spent.

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.