6.0 LS, PRC 225 heads, .605/.613 231/243 114+5 cam, twin BW S366’s, flex fuel, Bosch 210’s, Bosch 02’s (2), Motion 92mm Icon TB, TBSS intake, currently 40-50% ethanol. Holley smart coils, fire core plug wires, NGK BR7EF plugs gapped 18. Holley dominator ECU. I have been chasing this issue for awhile now & admittedly electronics & wiring are not my strong suit by a long shot. It’s had this issue since first fire up which was done on 91 ethanol free fuel. The O2’s showed the issue & it had lean spike problems. As soon as I added e85 visible fumes/vapor were coming from the catch cans, I feel it was pretty excessive, not terrible but not right. I was able to drive the car & it wasn’t doing anything scary, while driving and under load all the sensors were reading happy, car was mostly happy, still noticeable vapor/smoke coming from the catch cans but only slightly embarrassing. Still not right so I’m obviously trying to get it there before leaning on it. Put some offset in that cylinder and now it is a smoke show from the driver side catch cans AND the exhaust. The passenger side catch can stopped smoking. I unplugged the #3 injector & coil & ran it for awhile, minimal smoke/vapor/fumes & eventually none. I have swapped through 4 spare smart coils, all the coil wiring etc & feel spark has been eliminated. The Bosch 210’s are brand new, they have been cleaned 3 times and flowed twice since being new, I’m pretty confident spark isn’t the problem, the physical injector itself is not the problem. This is a bad injector plug, bad spot in an injector wire somewhere, cross talk to other injector wiring, or something I haven’t even considered. If there’s anyone savvy enough to point me in a direction or offer some troubleshooting advice/instruction I would truly truly appreciate it. Thank you much in advance! I will attach a few videos of it running with cylinder 3 working & one after I unplugged the injector and coil.

10.3:1 6.0, 225 PRC heads, cam .695/.613 - 231/243, twin BW S366, VSRacing gen 3 44 mm wastegates & 50mm BOV, Bosch 210’s, TBSS intake, Holley smart coils, Holley Dominator, O2’s 18-22” after turbos, 3.5” dual exhaust stops about 2’ before rear differential, will be flex fuel but for initial start/tune is on ethanol free 91, BR7EF plugs, Firecore wires, Motion 92mm TB, fuel pressure at 55 psi, 10 an splits to 8an to feed each rail then out each rail into the reg & return is 6an, vacuum ran from intake to dist block feeding map & BOV, fpr has own vac line from intake, vac from cold pipe to wastegates, 2 in 1 out treadstone innercooler, on board air to wastegates, Holley dual boost controllers. I can find zero vacuum leaks, fuel leaks, injectors were brand new and have been tested twice, played musical coils with 4 spare smart coils, compression check was 200 psi - 208 psi & leak down was 4-5% with 1 cylinder just under 7%. First start both banks are fairly even & slightly rich then it settles for a few seconds and it’s all stoich, then the odd bank starts to have lean spikes, going from stoich & briefly flashing 15:1-16:1 to stoich & stays like that, under 0-9% throttle it doesn’t respond much & even stumbles a bit, at 10-11ish% throttle it’ll run somewhat smooth & rev but still has the mild lean spikes, above that it surges and goes 19-11 lean-rich on the odd bank, and much smaller movement from the even bank. Closed and open loop. I do have a remote tuner helping out when he’s available & hopefully will be remoting in this week after a month of me tending to other issues. I have baptized this engine bay in brake clean looking for a leak & nothing, no exhaust leaks to be found. I have a smoke machine being delivered this week. I’m on my 3rd set of plugs, not that the other 2 sets are junk, just running out of ideas. All plugs show combustion is happening, nothing looks scary although mostly idle time doesn’t help read a plug. I had zero luck finding a way to plug the TBSS map port so it’s threaded with a bolt and oring screwed in.

I’m planning to travel to more car and race events around the country this year. What events are must-attends that I should add to my list?

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