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Re: Can I power up the ECM without an engine attached?
I did. I powered it up and flashed the ECM with a manual trans load before I installed it, because it had been ordered as an AUTO harness. Worked fine.
Get ALL the grounds, and there's no guarantees!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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