Originally Posted by Quince
Big fat uncontrolled flame. Think i lost the little restrictor? When it did work, the pilot light would go out fairly often, which was a pain in the butt
That helps. When I had trouble with my '2012 Suburban 6 gal. it would be hard to light and keep lit. Turned out to be a mud-dauber nest in the combustion chamber.
After I cleaned it out, I was still having trouble lighting and a very noisy yellow flame. I removed the plenum and it looked fine, no rust, dirt, or obstruction. I even ran a pin through the small opening, but nothing seemed out of order. Reinstalled, but still had bad flame.
Installed a new plenum (looked the same as the old one) and that solved the problem. I still couldn't tell you what changed, but it lights on 2nd or third try and has a nice quiet blue flame now.