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On a lot of weber grills, the back of the tube burners have tabs that slide into slots in the back wall of the fire box. You have to take off the front control panel so the valves will move forward. This will allow the burners to move forward out of the slots. Install the new burners and be very, very careful to get the new burners mounted on the valves correctly when you put the front plate back on, or you will have a flash back fire problem.
I believe your model Weber has a Cross Over Tube Burner , on the left side of the interior of the grill, just above the middle and back burner. If that's clogged or needs replacing, that's more than likely the culprit. As, it won't carry gas to those two burners. It is easily replaceable, if necessary.
In case you have misplaced your Owners Manual, I have included a link to it. You can download and print it for future reference.
Hello, It sound like your back burners have a partial blockage or possibly are rusting or falling apart or have cracked seams. Remove the cooking grids and burner shields, and examine the burners closely. If you can't find a blockage inside (spider web, bugs nest, etc) then their condition is probably deteriorating. Let us know if you need more assistance.
I bet your grill gets no hotter than about 300 with the lid closed?
The tank has a built in safety feature. If a burner is left on when you open the valve on the tank, or turned on too soon immediately after opening the valve on the tank, the flow will be restricted. You need to turn all burners off, close the tank valve, disconnect the tank, reconnect the tank, open the tank valve, waqit a few seconds, open the burner valve and light. You'll get unrestricted flow and much better heat.
You've got two different things going on. First - the type of igniter used on your model does wear. I have had mine for over 10 years and have gone through 3 such igniters - and I grill nearly 3 times per week over the 25 week "grilling" season where I live. Spring for the $12 part and just replace it.
The other issue sounds like a clogged cross-over system. I would remove the burners, including the cross-over bar on the far left side that connects them. Clean the exterior with a stiff steel/brass brush and the inside with a bottle brush. Make sure all the holes are clear to allow gas to flow easily - use a wooden tooth-pick to do this to make sure you don't change the size of the holes! Put that baby back together and I think you'll find you'll be good as new!
These grills are great. Now, if Weber could only fix the uneven heat problem between the left and right side I'd REALLY be happy! (I wish they would even just admit there IS a problem!)
Good luck and happy grilling.