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Originally Posted by Vince@MSperfab
are talking about the PSI harness or the factory GM fuse panel?
I was thinking he might have those mixed up but the PCM is powering up from his description.
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He said he has the PSI harness. Maybe injectors are clogged but to have all clogged would be a surprise to me.
Car had a engine fire which could have damaged them however as I read it he has different injectors in it now.
As always it's probably something simple like a loose ground.
A friend of mine had a problem with his LS and PSI setup cranking and not starting. Turned out where the 2 grounds bolt to the rear of the head the bolt was a touch too long and bottoming in the threads. The bolt was tight but the grounds were loose.