Cylinder flooding

Sorry but this will be a long post as I will be putting as much detail as I can in here.

The problem started when I was warming up the car one day, after 5 mins or so the car started to feel like the RPM is dipping and a couple of minutes later the misfires started to happen.

Babied the car home and there was white/gray-ish smoke coming from my exhaust and smells like fuel not to mention my gas mileage is like 1 gallon/mile, luckily I was only like about a mile or so away from home. Pulled the codes and misfire on cylinder 6, and multiple cylinder code came up w/ pending codes for misfires in cylinder 4 and 5.

Thinking it was coil pack since it was still the ones from factory, I changed them. The plugs looked great on cylinder 1 thru 3, cylinder 4 was burning a bit rich, and cylinder 6 was burning really rich while cylinder 5 was okay as well.

The next day I started the car and the same thing happened, first 5 mins it was fine then it started misfiring again, I asked around the forums for my car and they said it may be the pre-cat o2 sensor since it only happens on one bank which is bank 2 and only when the car gets up to temperature.


Switched that, tried starting the car and noticed my battery was low, let it charged for a bit tried starting it and it cranked twice and stopped thinking its still low in battery I let it charge for longer and tried starting it, cranked 3 times then a pop came up and now my starter is just spinning.


Fast forward, in the process of replacing my starter, I noticed that cylinder 6 throttle body was full of fuel! Checked inside the cylinder and there was none, it was just in the throttle body, so I tried to remove as much fuel as I can, did my starter replacement along and did the "De-flood" procedures to get rid of the remaining fuel in the throttle body that I can't remove.


After putting the car back together and started it, the car started misfiring right off the bat, I've read that it may do so in the first few minutes after a de-flood I let it idle for a couple of minutes but it never went away, the smell of fuel is up and the exhaust is putting out the white/gray-ish smoke and wet w/ fuel.

I stopped the car, removed the plugs and inspected them, cylinder 1-4 are perfect, cylinder 5 this time is wet! And smells like fuel and cylinder 6 is burning rich (black powdery stuff is on it but easily wiped off).

Now cylinder 5 is "flooding" checked the throttle body on it and there was fuel in it, checked inside the cylinder and its relatively dry there, did the de-flood process again. And tried again, the same results came up and its cylinder 5 that is flooding this time.


I figured maybe the injectors is bad? So I removed them and the injector on cylinder 5 is stuck open upon testing w/ my injector adapter to the spray cleaner, I didn't apply power thru it and the spray cleaner just sprayed thru the injector w/ even powering it up. Other injectors didn't do this.


So I sent the injectors to get worked on and tested and they came back w/ the results, the before test results was terrible, w/ only one injector at"fair" status. The rest was either poor pattern or poor pattern w/ dripping faults and not putting out enough fuel, after their job is done they are back to brand new status.


I received them and put them back to the car and tried starting the car again, the same thing is happening still, but this time it went back to Cylinder 6 instead of 5. Checked spark plugs and cylinder 1-5 plugs looked great. Cylinder 6 was wet w/ fuel. Checked the throttle body on it and it is full of fuel.


Now it got me thinking, maybe there's a burn thru on cylinder 5 and 6 on head gasket and thus affecting the compression on the two cylinder.

Checked the compression although it is a cold engine compression check so I can't achieve the highest compression the cylinder could have but the results was consistent and surprisingly close to what the recommended compression on the s54 engine which is 160-172psi. I got 150-155 across the cylinders w/ cylinder 6 getting 155psi on a cold engine compression test.



Now I am clueless, what else could cause the flooding on this. Any advice on what else I can check? Thank you!