Phosoup253 Posted July 23, 2022 Share Posted July 23, 2022 Bought an auto 2005 lgt complete swap as a replacement for my 2005 lgt manual. I swapped my entire intake manifold engine harness included to try to keep things as original as possible to avoid and issues. Ironically, I believe I have a faulty ground somewhere in my original harness. Am I able to use the auto engine harness on my manual car without issues? Link to comment Share on other sites More sharing options...
Max Capacity Posted July 23, 2022 Share Posted July 23, 2022 You'll want to send a PM to "m sprank" he would know. I'll see if I can have him respond. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
m sprank Posted July 23, 2022 Share Posted July 23, 2022 It can be done. But will require research. I swapped a 5eat with a 6mt and used the 5eat ecm and harness successfully. But, due to the ecm always searching for the tcu (and it not being there) logging and flashing became irregular. After about 1 year, the owner allowed me to swap harness and ecm to make it oem proper. I am not sure I have my notes anymore from the swap. I recall needing to wire the clutch sensor, speed sensor, grounding specific ecm pins no longer used, etc. It took me about a month of study just to figure out and modify the harness. Link to comment Share on other sites More sharing options...
Max Capacity Posted July 23, 2022 Share Posted July 23, 2022 So I guess the OP is better off trying to figure his issue with the harness that came out of his car. Hopefully after takes a step back, and goes over each connection making sure they are clean and tight, things will work. Most of the time, it's something simple. 305,600miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. (SOLD). CHECK your oil, these cars use it. Engine Build - Click Here Link to comment Share on other sites More sharing options...
Mike_Zocco Posted July 23, 2022 Share Posted July 23, 2022 Hey guys, just saw this thread and it semi-relates to my issue. I have a damaged wiring harness on my 07 LGT MT and its throwing codes. I bought an 08 LGT (also MT) wiring harness off of my friend but then after doing some research, I am getting mixed answers as to whether or not it will work with my pre-facelift LGT. If I install the 08 harness, do you guys know of any issues that may occur? Or should I just stick with replacing mine with another 07 MT harness. Link to comment Share on other sites More sharing options...
m sprank Posted July 24, 2022 Share Posted July 24, 2022 Big ecm change between 07 and 08. The wiring harness has a few differences as well. Once again, I am sure it can be done. But if a same year part is available, it might save a lot of headache. Link to comment Share on other sites More sharing options...
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