gameover4

need some help tried to first fire up my lsx swap and thing i have a huge problem on my hand
when turn car on it wont communicate with computer and says to service just about everything abs no fuel etc etc
if these two plugs were plug opposite what would happen? what else should i be looking for?

gameover4

also i was gonna start car up without coils plugged in to build some fuel pressure and oil pressure. now with car off but battery plugged and you try to plug in the coil harness, it starts to spark.
i really think i fucked something up bad bad

Unreal

Pretty sure those are keyed so they couldn't be swapped.

Brandon619

First off is this a custom built LSX or create LSX? What is this chassis is this installed in Z06 or ZR1. The reason I ask is you could have a different reluctor wheel (24 or 58) on the crank, this will cause you issues.

Unreal

Reluctor wheel won't cause all those issues.

Brandon619

Just throwing it out there

gameover4

Z06 and shortblock build. They aren't keyed and buddy tried hard to swap kinda stupid but anyways they are right now. Would that if shorted the ecm? Electrical system is going nuts

like I said car completely off and you plug single connector for one bank Coils and can hear them sending spark

Unreal

Sounds like you might have damaged a bunch of stuff by swapping those connectors. Best of luck.

gameover4

Hopefully someone can tell me what will occur doing this.

gameover4

this point im guessing the ecu is fried and hopefully not the entire vechiles electronics... anyone know if gm can test a ecu to know if fried?

Unreal

Probably cheaper to buy a new ecu than pay GM to test it.

Have DSX setup you up with a new ecu.

gameover4

Who is that? Website?

Tech

https://dsxtuning.com/

Patro46

First off. STOP!
Spend a few days educating yourself on WTF. A great place for you to start is LT1.com or net, cant remember which.

Then you'll understand where those pesky pink wires go, and understand most of the PCM controls are negative switched. One wired incorrect relay and you get poof....

If you "poofed", you better understand how a modern PCM functions, or you'll poof again.

I spent several days in research, and I'm glad I did, plus I was able to utilze many features often left out during LS swaps.

Once again, LT1.com

TTZ06VETTE

Sounds like you have somehow mixed up some constant "hot" 12v wires/harness with ignition switched "hot" this could be anywhere in a number of places including harnesses, starter, fuse box etc. have you blown any fuses? Probably going to need to test ECU and BCM at a minimum then figure out where the wiring issue is.

gameover4

i ended up finding issue and really simple and luckly only popped 2 fuses. The ground wire that is near the starter wasnt on the block but on starter so it was all hot. move it and ECM and all was good to go. simple mistake on major builds like this. got lucky but car is running

Tech

Which fuses?

gameover4

i dont remember. it wasn't the ones i thought would of popped like ecu and stuff.