You are correct. The PCM is on the passenger side under the dash. I attached a pic below.
The idea if a fuel smell is what concerns me. That can be caused by a loss of spark to the plugs causing unburned fuel to exit the engine via the exhaust. Or, you may simply have high fuel pressure that is flooding the engine.
Do you ever notice black or gray smoke from the exhaust when the engine starts? Does this only happen at an idle? If you hold the throttle to the floor when it won't start, does that make a difference?
The idea that you sometimes hear a backfire is leading me to think of a fuel pressure issue. Also, when the engine isn't running, you shouldn't hear the pump running. When turning the key from off to on, it will prime for about a second or two, but then it should turn off.
Take a look through this and let me know if anything mirrors what you experience:
Let me know.
Saturday, May 29th, 2021 AT 7:19 PM