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    10 seconds of oil smell when oil furnace starts up (5 Posts)

  • Ricky248 Ricky248 @ 2:33 PM
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    10 seconds of oil smell when oil furnace starts up

    When my oil furnace (forced air, no boiler)  is starting up, and I'm sitting or lying on my bed,  I smell oil.  The smell lasts only 5 or 10 seconds and stops either when or before (not sure) the blower starts circulating air through the house.     Now that my computer is in the basement, I spend hours only 25 feet (and around the corner through an open door) from the furnace and I never smell oil.   Though once i noticed the smell when I was on the landing from the first floor to the basement.  My nose is about 5 feet  off the floor!   I haven't noticed any smell  in the kitchen, or on the rare occasions when I'm standing right next to the furnace and it starts up, but I have smelled it in another bedroom where I used to have the computer.   Both br's are on the second floor.   When I'm lying down in my BR, my nose is only about 2 feet from the duct, and sitting at the desk in the other BR, only about 4 feet .   


    I found that the furnace has been using a hollow nozzle, when the name plate on it calls for a hollow nozzle.   Could that be (part of) the problem?


    The 2 year old CO detector in my BR reads zero, and the 8 year old CO detector also reads zero.    (Is there any point to keep using an 8-year old detector?)


    Thanks a lot.
  • earl burnermann earl burnermann @ 2:57 PM
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    how old is furnace?

    Some furnaces use temperature to start the fan but new ones are on a timer. I'm taking a wild guess that you have a oil spill, maybe in the blower cabinet that needs to be cleaned up. Could just be a small amount in the blower cabinet.
    If the women don't find you handsome, they should at least find you handy!
  • billtwocase billtwocase @ 4:29 PM
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    possible

    crack in the heat exchanger? I would have it checked. Could be an inspection door, or clean-out access port, delayed ignition, rotted or disconnected smoke pipe, partially or plugged chimney, down draft, and countless other causes. Have it checked by a pro.
  • add add @ 7:52 PM
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    cold chimney

    My question is ,does this happen only on a cold start or every time the burner fires up,some pics of the smoke pipes would be helpful,i don't think you have an oil leak otherwise you would smell the oil constantly,maybe a slight delayed ignition so i suggest to check for carbon around the nozzle and retention head.
  • Ricky248 Ricky248 @ 6:19 AM
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    Sorry for late reply

    Sorry for late reply**    Thanks Earl, Billtwocase, and Add for your replies.

    The furnace is 34 years old.  Out of work,  I can't afford a new one now, and I'm not the only one in the n'hood who is still using the original furnace.    If there is a spill in the blower cabinet, would that be more easily smellable upstairs when the fire starts, but before the blower starts?  It seems like the blower would increase the smell, but by the time it turns on, the smell has gone away.  

    Delayed ignition sounds likely.   What is the cure for that?  I checked the electrode gap, and I changed the ignition transformer (to one just as old.  With the old one it was stopping for no apparent reason.)     What else should I do to fix delayed ignition?

    It used to happen every time the furnace started, since the new nozzle I'm not sure.  I don't notice it as often.  There was definitely oil and lumps of oil residue on the nozzle and the electrodes when I took them out to change the nozzle and adjust the electrodes (which didn't need adjusting) . How do I stop delayed ignition?   :-)

    There might be a crack in the firewall.  I have some 4 minute smoke
    pills.  IIUC, I can light one, put it on a shelf in (or just throw it
    in????)  the firebox, and if there's a leak, smoke will come out of the
    grills at the ends of the ducts.  Is that right?    Any details on how I
    should do this?


    **I waited until I replaced the nozzle to see if that changed anything, but the previous nozzle was also Solid, as is supposed to be used.    And I had to replace the ignition transformer, from my spare burner.   And then I want ed to re-evaluate the symptoms.  It's heating well and for a while I thought the smell was gone.  It's surely not as often as it used to be, and I continue to only smell it in the bedroom, not the kitchen where I can feel the heat when it goes on.

    Thanks again.
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