Ok, so the short of this is, K2500, 3800 series one, twin T25 turbos, running on an OBD 2 setup connected to a 700r4. Start cold, it fires up, idles down, immediately misfires and dies. If you give it throttle, it fights through the misfire and will run mostly smooth at about 2k rpm. If I let it warm up it will idle, but the misfire sounds like it's got a huge cam, and the exhaust pours out white smoke like crazy. It either smells like fuel or oil, I can't tell.
Using series 1 L67 fuel injectors, a 2005 GTP MAS, series 2 knock sensors, series 2 MAP sensor, and everything else is stock 1991 series 1 3800 shit (TPS, IAC, IAT, crank and cam sensors, type 2 ICM and coils, etc...). I recently added O2 sensors (from a '04 LS) as that's what I had on hand. Wire harness started out as a '98 Bonneville harness, I've nipped and tucked it to fit this application... so everything got nipped, only the bare minimum to run the engine was kept.
The turbos have a 7/8" drain straight down into a vented tank. An electric pump pulls oil from it back to the oil pan. When I ran it like this (after making the change to 7/8 drains and pulling the exhaust to add the O2 sensors) no oil was leaking out of the turbos anymore so I put the rest of the exhaust back on to find the white smoke show, as well as oil starting to pool in the intake side of the left turbo. The right exhaust blows more smoke than the left thus far.
The only codes being set are for P0300, so that just means the PCM has no clue (as usual). Coils seem to be firing, I can't narrow it down to a specific cylinder other than #6 yet (based on scan data showing a trend to misfires on #6). But that was before adding both upstream O2 sensors.
I've swapped the coils around with known working ones, doesn't seem to help the issue. I've also swapped ICMs. I still think that the coils are firing weak though, the spark won't jump the gap from the post to the screw on two of the coils, doesn't matter what coil is where or what ICM I use. They are sparking, just seems weak to me.
Using series 1 L67 fuel injectors, a 2005 GTP MAS, series 2 knock sensors, series 2 MAP sensor, and everything else is stock 1991 series 1 3800 shit (TPS, IAC, IAT, crank and cam sensors, type 2 ICM and coils, etc...). I recently added O2 sensors (from a '04 LS) as that's what I had on hand. Wire harness started out as a '98 Bonneville harness, I've nipped and tucked it to fit this application... so everything got nipped, only the bare minimum to run the engine was kept.
The turbos have a 7/8" drain straight down into a vented tank. An electric pump pulls oil from it back to the oil pan. When I ran it like this (after making the change to 7/8 drains and pulling the exhaust to add the O2 sensors) no oil was leaking out of the turbos anymore so I put the rest of the exhaust back on to find the white smoke show, as well as oil starting to pool in the intake side of the left turbo. The right exhaust blows more smoke than the left thus far.
The only codes being set are for P0300, so that just means the PCM has no clue (as usual). Coils seem to be firing, I can't narrow it down to a specific cylinder other than #6 yet (based on scan data showing a trend to misfires on #6). But that was before adding both upstream O2 sensors.
I've swapped the coils around with known working ones, doesn't seem to help the issue. I've also swapped ICMs. I still think that the coils are firing weak though, the spark won't jump the gap from the post to the screw on two of the coils, doesn't matter what coil is where or what ICM I use. They are sparking, just seems weak to me.