I am not familiar with your vehicle but, you really should not be smelling gas under the hood. I would check for vacuum leaks. make sure the hoses are not cracked or dry rotted. I have heard that the pcv valve on those engines are problematic and need to be replaced.
there are more qualified on here that can help you. best of luck.
This thing is way out of warranty so I have no idea what you mean by ’ send it through the dealership window '. No offence but you need a good independent shop to look at this and I also agree that you should not smell fuel .
I was as detailed as I could be, I’m not a mechanic, the next stop is the mechanic, I’m just trying to gather as much information as possible, and I do understand that is problematic on this platform without someone familiar actually taking a physical look.
I own a 2009 Corolla with the 1.8 liter, although not an S type, and no, you shouldn’t be smelling gas so I’m guessing there’s a leak somewhere. I am not a mechanic but I suspect the two issues are connected, i.e., the engine is starving for fuel.
My guess, all of the symptoms are the result of the misfire. Misfire means gasoline is injected into the cylinder, but it doesn’t ignite, then it is pushed out the tailpipe. That’s why you smell the odor of gasoline. The way the computer determines a misfire is by checking the acceleration of the crankshaft after a putative firing. If it doesn’t accelerate, it thinks there’s a misfire. Sometimes it gets confused about which cylinder is actually misfiring tho, so consider the possibility the problem might not be number 3, but a different cylinder entirely.
Purchasing a 2009 Corolla hardly seems a poor decision. One of the best econobox cars ever made. If you didn’t get a pre-purchase inspection, that might be where your used-car-purchasing system failed you. But not the make/model/year.
The way mechanics diagnose typically misfires is to interchange parts cylinder to cylinder to see if the misfire moves to the other cylinder. Coils, wires, fuel injectors, etc. If swapping parts yields no info, next step is a cylinder compression test. Noid tests common too, to see if injectors are actually being fired by an electrical pulse. You are always welcome to report the results of your experiment’s here for more ideas. Until you get the misfire problem solved, no chance of solving the others. And solving the misfire might well solve all the others. I have the sense you are over-worrying a little. Suggest to discontinue replacing parts and instead focus on finding the exact cause. One problem with the parts replacement idea, the new parts may not work, so you are just making the diagnosis more difficult. It’s also very easy to run out of money before running out of ideas what to replace.
A single cylinder misfire shouldn’t cause stalling or hard starting. If you’re smelling gasoline in the engine compartment then there must be a leak, or else your exhaust is leaking and unburt fuel is leaking out before it goes out the tail pipe.
Maybe it’s time to measure the fuel pressure?
Have you tried unplugging the oxygen sensors to see if that changes how it idles?
Sometimes a spark plug will look ok appearance-wise, but have a crack in the ceramic or internal disconnect so that’s another idea for OP to test by the swap method. When the spark plug is removed, the tip appearance can be diagnostic as well. If OP could obtain a fuel trim test, that might be helpful.
Frankly I have no idea that part is. Again, I am not a mechanic. No offense but I think you’re in over your head and you need the services of a pro with hands on the vehicle.
I’ll echo the sentiment that a 2009 Corolla has the potential to be a great little car. Mine is going strong at 131k with mostly just routine maintenance. If you can get whatever’s wrong diagnosed and fixed yours could easily serve you well.