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Re: 5.3 first start wont start
Something to check..... this happened to me when I went to fire mine for the first time, only on the ignition coil side. But the same theory applies; be sure that the trigger wire for your fuel pump relay has 12VDC in BOTH the run AND crank position. On mine, I had 12VDC to the ignition relay when the key was in the run position, but power disappeared when the key was in the crank position. Found a wire that had power during both positions, and it fired right up.
Also, you have power to the injectors, but have you checked to be sure they are actually pulsing fuel? I have heard of many, many cases of someone trying to start a bone yard Gen III/LS engine for the first time after it has been sitting for several months, only to find out most if not all of the injectors were plugged.
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