I have a kenmore stove model number 790,72403012 and 3 of the 4 burners are working. They all are getting a spark, but the front left won't fire up.
First, try to light the burner in question with a match. Just hold a match to the burner, then turn the gas on to low. If the burner doesn`t light, the problem is the gas supply to the burner. Next, lift the top cover and put the prop rod in the hole in the cover to support it. Hold a match to the left-front burner. Now, turn the control knob to "light". You should see the igniter spark and hear a snap. If this doesn`t happen, repeat this step with the left rear burner. If you hear the spark and snap.
If the igniter doesn`t work on the front left burner, but does on the rear left burner, the igniter does work. The problem is likely the control knob for the left front burner. The. Control knob includes the electrical switch the activates the igniter when you turn on that burner.