Anyone ever had a problem with a 7638B autosampler when injecting?

One thing to try is take the syringe completely out and see if it stops again.

It doesnt stop when there is no needle, so its either the spring of the syringe motor or its a problem with the septum/little spring by the injector..?

Check to make sure the syringe can go through the insert into the column.  You will need to remove the insert from the inlet.  The insert is dependent on column inner diameter also.  See pages 110-111 of the 7890 Maintenance Guide: 7890 Series GC Maintenance (agilent.com).

It looks like your GC is a 6890, but the most of the procedures and consumables are the same for the cool on-column inlet between the 6890 and 7890.

Yes thats what i checked and its not going through the insert, unfortunately we dont have other inserts now so ill order them and hope this fixes it. Thank u for your help

You said it's your first week there, was nobody using it before? 

oh yeah but the GC specialist been gone since september and I started november so no one to consult on this issue

Ok sounds like most labs... a skeleton crew. :)

yes

yes