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FID NOT IGNITING

Matthew.c

Hello, I'm new here and having problems with FID Igniting and concentrations of standards and samples are lower than expected. 

I'm using GC Agilent 7890B, GC ran out of air on the weekend, we replace the air tank today as usual and since the FID has problems igniting (unless someone blows on it). Already check for leaks, changed ignition copper washer, cleaned the FID Jet, cooked the column for about 10-15 minutes. After that standards concentrations were low. and FID wont light without blowing

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    Update: FID output signal was very low even when trying to ignite, so we checked the interconnect spring and noticed it was shorter than the ones in the other GCs (not that close to the detector base; dont know if it was always like that or something happened to it?), cleaned it with a KIm wipe and wiggle it out a bit so it was closer to the detector base. Ignited the FID again and it worked, ran blank and standard, baseline is funky and has weird peaks (maybe contaminants?). Now the problems is sometimes mid-run FID output signal goes very high and  makes FID flame turn off, but it DOES re-ignite by itself when that happens. 

    I'm not sure if we fixed it and just needs time to get back to normal? or the REAL problem is still there? 

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    Update: FID output signal was very low even when trying to ignite, so we checked the interconnect spring and noticed it was shorter than the ones in the other GCs (not that close to the detector base; dont know if it was always like that or something happened to it?), cleaned it with a KIm wipe and wiggle it out a bit so it was closer to the detector base. Ignited the FID again and it worked, ran blank and standard, baseline is funky and has weird peaks (maybe contaminants?). Now the problems is sometimes mid-run FID output signal goes very high and  makes FID flame turn off, but it DOES re-ignite by itself when that happens. 

    I'm not sure if we fixed it and just needs time to get back to normal? or the REAL problem is still there? 

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