Cant figure out no spark

[jchristian24]

2005 5.3 dbw coils will not produce spark and i cant figure out why. I've been over the harness several times checked power and ground at key on/off and during cranking. All power and grounds are consistent all sensors seem to be functioning vats is deleted every test i can think to run has been done and still no spark. changed computer today wasted 2 credits and still no spark. camaro no start.hpl I have attached a log of what it does during cranking hoping somebody spots something i may have missed.camaro no start2.hpl

[edcmat-l1]

About all you can see in any data log that would pertain to a no spark no start condition is cranking rpm and voltage. That being said, it's most likely a bad or no ground issue. Each bank has a ground on the back of the head.

[jchristian24]

Yes just rechecked my log file and it isn't the one where i was checking coil circuits and cam and crank. Going to upload the other log now. It is definitely not a ground. Thought the same and currently have the entire harness unloomed and layed out to check every connection. It has to sensor or ecm based at this point.

[edcmat-l1]

Yes just rechecked my log file and it isn't the one where i was checking coil circuits and cam and crank. Going to upload the other log now. It is definitely not a ground. Thought the same and currently have the entire harness unloomed and layed out to check every connection. It has to sensor or ecm based at this point.

What sensor would cause a no spark condition? Answer is, one. If you have cranking RPM your crank sensor is working. Your cam sensor has nothing to do with making sparks.

It's not the PCM. The PCM isn't going to decide all of a sudden it's not going to trigger all of your coils.

Why on earth would you pull the entire harness out of a vehicle because it has no spark? That's not going to tell you anything.

[jchristian24]

I guess i should have been more clear. Its an 05 5.3 in a 97 camaro. I reworked the harness for the swap and i haven't loomed it because i was not getting spark. I dont understand where to go from here then. I have checked all grounds all key and battery hots all wiring in general at this point and im still not getting spark. i have even ran dedicated grounds to the coil plugs just to triple check that isnt the issue.

[blindsquirrel]

Tune file is where? I don't see it.

Have you checked the wires from end to end, from the coil plugs back to where they're supposed to go at the PCM? What are you using for diagrams/pinouts? You have +12v at all the 'D' terminals at all the coils, and full-time ground at all the 'A' & 'B' terminals (A goes to chassis, B grounds back through the PCM).

[jchristian24]

Didn't post the tune. Only thing done there is vats delete. The logs are posted in the original post.

[jchristian24]

I'm only getting power to the pink nothing on the other signal wires

[blindsquirrel]

So you don't need to post the tune? OK. Good luck.

[gtstorey]

Why are you not answering all of the questions? Blindsquirrel is asking pertinent questions? Have you checked out the harness using the correct diagrams for the particular ECM that you are using? Not a close enough diagram downloaded because it was free. This is almost always a wiring issue.

[jchristian24]

I can post it it just didnt seem relevant.97 camaro stock.hpt

[jchristian24]

I used pinouts from lt1swap and they were exact every wire color and where it went. i have traced every wire to every source and yes i am getting 12v+ on all d terminals and ground on all a and b

[edcmat-l1]

I guess i should have been more clear. Its an 05 5.3 in a 97 camaro. I reworked the harness for the swap and i haven't loomed it because i was not getting spark. I dont understand where to go from here then. I have checked all grounds all key and battery hots all wiring in general at this point and im still not getting spark. i have even ran dedicated grounds to the coil plugs just to triple check that isnt the issue.

There ya go. All bets are off. No one can really even help you diag this via interwebz.

PS doesn't matter if you post the tune or not. The problem or solution is not in the tune.

[blindsquirrel]

I like to confirm the year/make/model before posting wiring diagrams to help people out, and yes, I know about the Details tab in the scanner but that can be mismatched from the actual OS if the VIN's been swapped. But anyway, blindsquirrel will not be asking any more questions in this thread because the OP does not think he needs to answer in order to get his problem solved.

[jchristian24]

I have been trying to answer all questions and have posted the tune and am doing my best to cover any questions asked. I?m not completely new to this. I have done about 12 LS swaps on multiple vehicles and have never had this issue. I went through everything I could before reaching out and only reached out when I had exhausted all other resources or known options.

[jchristian24]

The donor vehicle is a 2005 Chevy suburban and was swapped into a 97 Camaro z28.

[gtstorey]

If you are sure about your wiring, you probably need to get the service manual diagnostic steps for no start/no spark for the donor vehicle. I don't think there is anything in the tune that would make it not fire at all, but I'm no expert on that.

Have you confirmed that the coil circuits can actually handle a load beyond just a voltmeter?

[jchristian24]

I?m not quite sure how to confirm they can handle a load?

[gtstorey]

Incandescent test light.

[jchristian24]

Mind elaborating on the process