Have had this problem off and on for about a year, now it refuses to run, have replaced both crank and cam sensors, the entire thottle body -including sensors. This problem aparently showed up when the motor was replaced
This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into especially after a motor has been changed. The bypass they did may be failing. http://www.diy-gm-security.com/
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it gets fuel and spark will start and run for a few seconds then dies. if i prime it it will run a few more seconds.
Running for 3-5 seconds and then dying is a good indication that the security system is failed
I bought a Vats bypass and still have the same problem I did notice that the windshield is leaking onto the ECM I think water contamintation may be the whole problem.
Im not sure just yet if IM going to get away with just a new ECM or if I have to find a good harness as well
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