CG, unfortunately you replaced the wrong part. The problem with your oven is the igniter. The igniter is wired in
series with a safety valve. The safety valve monitors the amount of
electrical current flowing through the igniter when you ask it to
"bake". When the igniter gets "weak" it won't allow current to flow
through it properly, this will keep the oven from heating. It will also cause your symptoms as well...
Here's the scenario; Say your safety valve is "looking" for 2.5 amps of electricity flowing through it before it'll open up and allow gas to the manifold. Your igniter is designed to allow 2.8-3.2 amps to flow in good operating condition, but your igniter has become "weak"... it's now allowing 2.48-2.51 amps. The safety valve is sensing this and opening and closing rapidly, allowing gas to flow through it (fluttering). BUT! the igniter is not hot enough to ignite the gas and/or there is not enough gas to ignite do to the fluttering effect of the valve. Sometimes it'll light sometimes it won't.
Your igniter is the cause and needs to be replaced.
you begin the repair, you should have the new part on hand. The part
number is WB2X9154 and can be purchased at your local appliance parts
retailer for about $50.00. Here's one online
First, UNPLUG YOUR OVEN!
replace it... Remove the racks and lower panel (oven floor). This will
expose the burner manifold where the igniter is mounted. (It's the
round thing on the manifold near the back... it has 2 wires going into
it.) You'll need a 1/4" socket or nut driver to remove it.
(*TIP---> before removing the screws from the igniter, put a few drops of liquid dish
soap on the threads to lubricate them. If you do this, you will not
strip the threads of the screws and it will ease their removal.)
new igniter kit will have two ceramic wire nuts in it. Cut the two
wires off of the old igniter and strip them back about 3/8". Then
connect the wires of your new one to the wires in the oven using the
ceramic wire nuts provided. Then mount the new igniter and rebuild the
(*TIP---> The new igniter is very fragile! [that's why it came wrapped tightly in bubble wrap] Handle it gently!)
There ya go! Total job time? ~45 minutes.