Hi all,
We are running a 7890A/5975C GC/MS. The instrument runs when in split mode, but when switched to splitless the sample will not inject. We have always run splitless injections. The instrument will be initially ready and becomes not ready just prior to sample injection during the prerun due to the pressure in the inlet suddenly increasing above the set value and staying elevated. This leaves the syringe just sitting in the sample vial. I have tried general maintenance on the inlet and replaced the septum, gold seal, inlet liner, as well as recutting and reinstalling the column to the GC. None of this seemed to be the issue. Not sure if anyone has any ideas on how to resolve this issue?
Thanks!