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No start in cold WX

Stone Water

New Member
Joined
Jan 25, 2022
Messages
1
Well just like it says, it won't start in cold weather. The thing I've found that works is to leave the key on for a good 2 minutes or so and then it cranks up. 2003 z71. For some reason previous owner had cut the fuel pump circuit to wire a relay outside of the fuze box so at first I was unable to run an injector balance test because the fuel pump would just stay on. Ive since reran the wires to the correct spots and fuel circuit works as it should now with prime and run sequence. Injector balance test shows all injectors within 2 psi of each other and almost exactly the same psi only being off here and there by 1 psi. Im not sure where else to look. Previous owner cut out the cats so I get codes in my O2 sensors and those are the only other codes. I suppose it could be a fuel trim because of that. Any other ideas please.
 
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