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  1. J

    25 psi after swap

    Sorry if this is a redundant post, I've been driving my 5.3 nv3500 swapped 90 Sierra for about 3 months now. I finally ironed out the OBD2 sensor and realized I had two codes, P0174 and P0171. I bought a fuel pressure gauge and read 25 psi at the fuel rail, key on engine off. I tested for vacuum...
  2. J

    5.3 Swap crank but no start, Urgent

    First time posting here, sorry if its not formatted perfectly or anything. I just swapped a 05 5.3, with an NV3500 into my 1990 Sierra, followed LT1 website to make custom harness, and fuse block. The problem is that my engine will crank, and will easily start with starter fluid, but dies soon...
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