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Corsa SRI/VXR Losing Crank Signal after a few seconds.

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  • Corsa SRI/VXR Losing Crank Signal after a few seconds.

    Hi,

    I recently bought a engine out of a vxr and forged it and put it in my SRI. When i went to tuen it over it fired for about 5 seconds and then shut off, so i plugged in my ***** and had error codes p0339(crankshaft sensor wrong signal) and p0335(no crank signal). after playing around for a few minutes i found that i would have rpm signal for about 3-5 seconds cranking with fuel injectors disconnected then i would loose rpm signal both on dash and *****, and i would have to recycle the ignition to get the rpm signal back again. so i replaced the crank sensor and i have the same issue.i had a check of all the ground they seem good. wiring does not appear damaged, connector bone dry. its weird how it runs for 5 seconds and loses rpm signal suddenly. any help would be appreciated.
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