Symptoms of Leaky Injector

[WarrenBoostit]

Hey all, currently on the GH e30 tune, which the car has handled well over the years. Recently, I've noticed if the car sits for a few days, it's started to have a momentary stumble upon cold start. Long term fuel trims look normal, 1.03 ish, but on startup after it leaves open loop, short-term fuel trims in Bank 1 are ~0.86 and Bank 2 are ~0.93. Within a few seconds after it starts to warm up it normalized back to 1, with no real movement on LTFT. Last night I started it after a very heavy rainstorm (it was parked inside, but very humid), and it actually had a backfire, unsure of which side, but I have noticed the left exhaust (Bank 2 I believe) seems to emit more fumes on startup. Outside of these symptoms however, I haven't noticed anything else, no CELs or weirdness once warm.

This leads me to think I might have a dripping injector in Bank 1, making a bunch of pooled fuel burn which makes the O2 freak out, and run lean. I ran BG44k through the system a few weeks ago after an oil change, I'm unsure if that could've provoked something. It's not the biggest problem in the world right now but makes me nervous, I don't want to hydrolock a cylinder or be stranded somewhere in limp mode. The first checks I am thinking of are smelling the oil for any excessive fuel dilution, maybe pulling plugs, but I'd love to get your guys input on troubleshooting techniques or causes for this.

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Black 2018 SHO Non-PP | GH e30/AO Tune | PPE Catted Downpipes | DG2 Trans Mount | M-12405-35T plugs at .026 | 170 Tstat | 3 bar | H&R Springs | XDI-35 | Badges removed | Chrome delete | Fuel-it Bluetooth ethanol analyzer | GH IC | EPP Gen2 CAI | Noisemaker delete | MSD coils | Ceramic coating | Window Tint | EPP Hot Pipes | Black AR924 w/ General GMAX AS 05 255/45r20 | MRT axle back w/black tips

 

[Shadow351]

I've had 2 instances of leaking injectors. The first one would cause an intermittent, slight hydro lock on startup (you could hear the starter struggle to start turning it over, but then it would start and smoke for a little bit). I actually had a Blackstone oil analysis done and they confirmed my leaking injector suspicion as the oil sample had excessive fuel dilution.
The 2nd fuel injector that failed, failed wide open while I was on the interstate. For that one I had to get it towed home, but I put a borescope down the suspect plug hole (It threw a cylinder 3 misfire code) and you could see fuel spraying in the cylinder when the fuel pump primed. There was also a puddle of fuel on top the piston.
The borescope down the plug holes is where I'd start. I got my borescope on Amazon and it was only like $20. Unfortunately, Its not listed anymore, but I'm sure there's something comparable currently available.

 

[kryptto]

Amazon and it was only like $20. Unfortunately, Its not listed anymore, but I'm sure there's something comparable currently available.

get an articulating one you can twist and move