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View Full Version : 5.3 conversion wiring Confusion/solution


Pro-Tour Heavy Chevy
08-16-2009, 09:18 PM
I have a 2003 5.3 engine only so I have to supply my own harness and ECM. I can get a deal from Painless, and get a reman ECM. Or go through Tech Rods and get a Reman ECM and have it Re-Flash. My rep from painless says that they will re-flash my ECM to my specs for free.
Or Get a donor harness (if so from what car) and mod it and get a Reman ECM. Lots of options in need of a little guidance. I will be using a LS-1/6 Intake and a 200-4R trans and Camaro based Kwik-perf Pulley system. HELP:rolleyes:
oestek
08-17-2009, 06:35 AM
Are you near a decent chassis tune shop? I'd get the stock ECM and have then tune / flash the box with an edit program so you know it's right.
Pro-Tour Heavy Chevy
08-17-2009, 06:29 PM
I have a decent shop nearby and I will more than likely take it to them to dial it in. I just checked the so-called deal on painless and I guess I'll be looking elsewhere. I assume if I get a Camaro Harness (for example) and remove all the un-needed stuff myself then get an ECM for the same year then I could have the ECM flashed by my local shop to get it running and then bring it in for a final chassis tune. Does that sound about right.
LS1NOVA
08-18-2009, 04:26 PM
Speartech.com
Wait4me performance

two more options for ya.
Patrick
08-18-2009, 06:44 PM
Another one for Speartech.
MuscleRodz
08-18-2009, 07:47 PM
Forget painless, go to speartech, not sure tech rods is even around anymore
SoCal Cruzer
08-19-2009, 08:02 AM
Yep, Tech Rods appears to still be on Ebay. $400.00 for harness.
69LT1Nova
08-19-2009, 08:06 AM
Speartech x4. John is great with supporting his harness if you have installation problems.

PCMforless.com for the computer.
Ollie8974
08-20-2009, 07:00 AM
Megasquirt
http://www.msefi.com
CarlC
08-20-2009, 08:13 PM
If you are on a budget you may want to consider an ECM and harness from a truck. The harness is usually long enough to mount the ECM where you wish, and gutting it is no harder than the F-body harness.
Pro-Tour Heavy Chevy
08-24-2009, 08:54 PM
Thanks Carl I may ask you for some advice/input later. I think that will be the way I go. With the truck harness/ECM and mod it. If I run the LS1/6 will I have to change the injector plugs? I don't think the trunk injectors will work with the LS1/6 fuel rails. Or has anyone made the truck intake look good(Just kidding). After this weekend I'll have 2 5.3's I'm picking up another one for a 20 pack of Coors light. This one is a clean runner top to bottom.