Gas smell coming from oven during preheat. once oven is warmed up, smell goes away. I have a Frigidaire FGF366EBC S/N VF6289284.What would cause this?

Typically, all gas operated appliances will get a "gas smell" from time to time. What you're really smelling is the odorant (rotten egg smell) that is added into both propane and natural gas, as these gases have no smell by themselves.

The smell will vary from normal to very strong as the "receipe" for how much ordorant is added into either your propane tanks or the gas supplied to your home. Typically, when tanks start getting low, the smell is more concentrated, while with piped natural gas, the smell can be very strong at different times, based on how and when the gas company adds odorant into the main supply lines.

Usually when a gas appliance is first turned on, the smell can be rather strong, until the gas ignites. So long as your oven is lighting properly, there is nothing to worry about.

However, if you're hearing a rather loud "whoosh" sound as the oven lights, it could be that your ignitor is getting weak and might need to be replaced. If you've got a weak ignitor, it could be allowing a little bit too much gas to build up in the oven compartment before it lights, hence the reason you're smelling the gas.

You can check for a weak ignitor by simply watching the oven when you start it, if the gas lights quickly, once the ignitor is glowing brightly and you've heard the "click" of the gas valve opening (in the oven), then everything is fine.

Hope you find this Very Helpful and best regards!