I'll try to be brief:
I had my annual oil burner service in September. Did not use the burner until early october and even through the month only lightly due to warm weather, anyway burner stopped working all together 3 weeks after service call.
Contractor came out again right away, said nozzle was clogged and restarted. (they had changed the filter and nozzle during the first call supposedly). Also i noticed that the weight on the damper was now set all the way to .08 which is as far to the left as it will go. Knowing that I've never seen it set that far, I put it over to 0.05 which is a guess at where it should be. anyway, burner seemed to be running fine for a while until...
starting last weekend, i noticed damper going back and forth fairly violently while burner was on and also a smell of exhaust and maybe oil, not sure, but probably just exhaust, hard to tell. Smell only near the burner, no smell in house.
So i called contractor again, he came out and to quote him adjusted air/fuel ratio and said burner fine. I'm not so sure though, he set the damper to 0.04 and it still goes back and forth and shakes some especially the first few minutes and the smell is still there. It goes about 1/2 way in and stays there once burner running awhile.
Questions: Is it normal to have odors like exhaust near the burner?
and 2, is it normal for the damper to run 1/2 way in and shake a bit durning first few minutes? I had heard that it should be about 1/3.
Thanks in advance. BTW it's a Carrier 80.5% efficiency oil burner. A very basic Hot air furnace with a Beckett burner.