I have inherited an upgraded HP GCD, basically a 5890 with some electronic controls and an MSD detector. The problem I'm having is that it acts as if I am doing a splitless injection, in that the solvent peak tails on for something like 6 minutes. This happens even at high split ratios (>100:1). I have 5890s that perform beautifully. Perhaps there is a setting in the parameters that needs fixed? Also, even though I have detector B set at 250-280 C, it says the MS temp is only about 20 C; could that be a problem? This instrument is critical in an important project. Thanks.