Tailing and loss of height

Hi Community

I have an Issue on one of our GC-FIDs 6890N. I have large Peak Tailing, especially on the back of my chromatogramm:

What i already did:

- New Column

- New Septa/liner

- New Gold Plate

- Cleaned Inlet and Detector

- Re-installed Column several times

We usually have a Split of 100 or 200 with this method. This method is a routine method, has worked since 5 years now and we didn't do any changes on it. So i suspect it rather on the technical side than on the instrument parameter side.

This is how it usually looks like:

Have you an idea what i could do next to solve this problem?

Thanks in advance


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