[SIZE=3]The left rear burner ignites but will only burn in a low flame even though the dial is set on high. The other 3 burners are working well. What could be the problem. Thanks for your help.[/SIZE]
The orfice can be clogged or your burner valve is going bad or your burner top isn’t sitting on perfectly right. Sometimes the burner valve is adjustable depending on unit. Try sticking a safety pin down the orfice to clean it out. if that doesn’t work i’d suspect a bad burner valve most likely considering all the rest work well.
Check these video’s out to determine what your problem is.
http://www.youtube.com/results?search_query=gas%20range%20low%20flame&oq=gas%20range%20low%20flame&gs_l=youtube.3...10227.16947.1.17443.40.31.9.0.0.2.190.3458.8j23.31.0...0.0...1ac.1.11.youtube.5f5o1gyPBSg