Burner Slow to Completely Light

[jaustin]

I have a Napoleon gas fireplace. The burner is a flat, rectangular shape with the gas holes in 2 rows - one at the front and one in the back - and a set of small holes in the middle to carry the igniting flame from the back to the front. The pilot ignites the burner without any difficulty and the entire back row ignites, the crossover holes to the front row ignite, and the right half of the front row ignites - all of this happening almost instantly. However, the small holes in the front that carry the igniting flame over to the left front slowly ignite, one by one, and it takes at least a couple of minutes before the left front area ignites. I've thoroughly cleaned the burner, blown it out, checked the holes, etc., but it made no difference. Is the simply normal? I haven't used the fireplace in a while but seem to recall that the entire burner used to ignite very quickly? If this is not normal, any troubleshooting ideas?

 

[Lennox65]

Is the gas pressure correct? Is the burner venturi tube squarely on the orifice? Is the air shutter set to the correct opening?
Is the glowing ember material placed correctly?

 

[jaustin]

There is no obstructing ember material and the air shutter opening is clear and has not been altered in position from when it worked correctly. Pretty sure the venturi is squarely on the orifice. I don't know about the gas pressure - I think the line pressure is ok as all other gas appliances are working normally, but I don't know about the pressure once it goes through the logs' internal valve and delivered to the logs' burner.