Check the injectors are wired correct you have to shift them to the right cylinders to match the firing order it can't be changed in the tune have to physically shift them or they run a little off and do funny stuff.if you just dropped an ls harness on as it was some will be wrong
See attached schematic I found on the internet and used in my build.
There are injectors and coil connections to swap out when going from LS to SBC
I have build three stand alone harnesses for others with no issues
Let me know
Mikey G
Need to swap out injectors 2&3 and 4&7
also need to swap injectors 2&3 and 4&7
That being said, motor will not fire up if this was not done. I'm sure this is not your issue for the erratic vacuum.
Mikey G
Mike G, Do you have a tune file you can share? i would use it start as a base tune for mine. Or the contact info of the place u had yours tuned at? Thanks
For my L31 SBC 24x conversion, I started with a 2002 LM7 5.3 liter flash. I made several changes to the following parameters, injectors, timing, and fuel to more closely match the 2002 Express Van L31. Starter .bin files located here: http://www.gearhead-efi.com/Fuel-Inj...rPro-Bin-Files The .bin file can be open by HP Tuners, EFI Live and TC.
dave w
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