Ya, I used SeaFoam last night. The only place it was coming out was where you see in the video. But being it that's after the final O2 sensors, I'm doubtful it's the culprit. I'm going to have the exhaust shop seal it up this week, since they should fix their boo boo's.
If that don't fix it, then I'll replace the O2's.
And if that don't fix it, then, I'm out of options. I'll just have to live with it lol.
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Hot air, and really hot exhaust air, like at idle,
rises and that leak looks to be big enough and near enough to the block, oil pan and front of the transmission, so it very well could be the source of excess heat at idle!!!!!
You might try swapping the final O2 sensors for the initial O2 sensors, and see if anything changes just for fun? But get that leak fixed first.
Do you notice any power loss at full throttle, that could be a sign of clogging Cats?
Those mini cats are so close to the block/head that I just got to wondering if they may not be overheating (engine running rich instead of lean would make them very hot, well beyond design???) and passing that excess heat back to the engine enough to cause an issue?
My donut leak never showed up at idle in 3 muffler shop tests, only at >60 mph on a long 60 minute drive did it get serious and even then it did not show up except as low oil pressure and a heat spike right after I pulled off the freeway and reached a stop light, at idle.
Frankly I think the close proximity of the pre-cats to the engine was a bad idea to start with.
Did we ever find a source that says the LTFT is not ok at your -7 to -11 range? I have never really studied the LTFT and STFT topic yet.
I assume your seafoam smoke test confirmed no Ex-Manifold to engine head gasket leaks left after tightening the bolts?