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Old 08-11-2009, 09:57 PM
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Join Date: Feb 2008
Posts: 9
93 300SD Injector ?


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


Portland, Oregon

1986 300 SDL, 1993 300SD, 1986 300SE, 1994 S350D, 2002 S500, 2008 ML320CDI
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Old 08-11-2009, 10:31 PM
Diesel911's Avatar
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Join Date: Sep 2007
Location: Long Beach,CA
Posts: 35,003
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?
84 300D, 82 Volvo 244Gl Diesel

Last edited by Diesel911; 08-11-2009 at 10:37 PM.
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Old 08-12-2009, 12:48 AM
compu_85's Avatar
Waiting for his Model 3..
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
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.


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

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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