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ls2 swap complete half motor not firing !?

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Old 09-28-2009, 10:54 AM
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Default ls2 swap complete half motor not firing !?
just finished my swap, all sensors are plugged and all grounds are grounded properly. however the passenger side is not firing. the manifolds are cool to the touch still. checked the hot wires on the coil packs and they are getting their 12 volt reference. kinda baffled right now....


also injectors are firing on that side, just not getting spark
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Old 09-28-2009, 11:59 AM
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Did you switch the two outer wires on the cam sensor harness
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Old 09-28-2009, 06:38 PM
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Originally Posted by 1sick'98WS6
Did you switch the two outer wires on the cam sensor harness
Sounds like the problem.
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Old 09-28-2009, 08:58 PM
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There is a 5 or 6 pin connector near the MAF connector that has 5 wires in it. One of the wires is used to supply 12V to the coils on one bank. I believe one of the other wires is 12V for the MAF or reverse lockout.

You can run a continuity check to verify which wire is for the coils.
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Old 09-29-2009, 12:48 AM
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Kinda sounds like you have the coils on backwards, I know of people who have done this. Like #7 on #1, #5 on #3, etc.
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Old 10-01-2009, 07:11 PM
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Originally Posted by C&CBird
Kinda sounds like you have the coils on backwards, I know of people who have done this. Like #7 on #1, #5 on #3, etc.
Happened to me on a swap once. Either suggestion could be the culprit though.
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Old 10-01-2009, 07:13 PM
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Coils can't be put on the wrong way/side..
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Old 10-02-2009, 08:02 PM
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A forum member told me he had the same problem...and it was because the reluctor wheel was installed backwards?
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Old 10-02-2009, 08:38 PM
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Really? That doesn't sound right.
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Old 10-02-2009, 09:17 PM
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I could not get my head wrapped around it.
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Old 10-14-2009, 11:12 AM
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did you ever find the fix...i got same issue on trans am i working on..
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Old 10-26-2009, 08:08 AM
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Can you post the fix?
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Old 10-26-2009, 09:27 AM
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Originally Posted by Petraszewsky
Coils can't be put on the wrong way/side..
Yes you can by putting the harness on wrong.
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Old 10-28-2009, 12:42 AM
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would like to know how u fixed this to for future referance
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Old 10-29-2009, 12:43 AM
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Depending on what car this was swapped into, and whether or not the harness was reworked to accommodate for it, he could not be getting switched 12v to the pink wire that should go to the coilpacks. I know several years back, when we attempted to rewire our own LS1 harnesses to interface with our RX-7's, we had only brought 12v to one side of the coilpacks, so only 4 cyl were properly firing. We then put power to that side of the packs and boom, ran like a champ
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Old 10-29-2009, 11:34 AM
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Originally Posted by andrewdruiz
Depending on what car this was swapped into, and whether or not the harness was reworked to accommodate for it, he could not be getting switched 12v to the pink wire that should go to the coilpacks. I know several years back, when we attempted to rewire our own LS1 harnesses to interface with our RX-7's, we had only brought 12v to one side of the coilpacks, so only 4 cyl were properly firing. We then put power to that side of the packs and boom, ran like a champ
LOL that sounds like the problem, I dont believe that You can put the coils on backwards... But that is just my opinion...
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