I am not an electrical engineer or EE student, I'm a diagnostic technician. AFAIK a CAN transceiver receives bits by measuring voltage between the network and it's ground/low reference.(high impedance, minimal current flow?)
When it transmits it pulls the bus to its dominant or recessive logica...
I have a weird random misfire under high boost (and RPM) on the GXP. Any ideas? It's pretty rare. Also, a few weeks ago, it happened right after I got off of the highway, in the middle of nowhere, and took a 270 degree right turn onto the service road. Misfire, flashing CEL, worked itself out 30 seconds later. I was driving to an autocross. Car did fine all day, all the way home, and the issue didn't show up again for about a week.
Compression is good (165,162,165,164), swapped ignition coils with known good modules from the SoS, new plugs (~3 months), new HPFP (also ~3 months as the old one was obviously leaking)... Not a lot left to check that I can think of other than the tune.
I have a friend with a nearly-identical GXP - years, miles, tune - that does not have this issue.
@Pᴀᴜʟsᴛᴇʀ2 (see above, if you have any insights I'd be grateful)
@3Dave - I haven't done days like that since I was in the Gulf War ... it was exactly like that 7 days a week, 16-20 hour days ... only it was for about 2.5 months ... and I was a LOT younger then, lol.
@3Dave - I knew it was like Ceshion's car ... I just couldn't remember which way the hood flipped, lol.
Would make it easier to run a fuel pressure gauge where you could see it ... tape it to the cowl ...
Faster sampling, more nodes on the network, and the GM networks of that era ('07) has been pretty well worked out by the community. CAN is also a much simpler protocol.