Rep Power: 0

Can’t seem to figure out the issue seems to be an issue with a sensor or something electrical car is an automatic and no transmission lights will power up on the dash can jump starter and get it to turn over but won’t fire

 
Rep Power: 223

Green key flashing in the dash? Checked fuses?

 
Rep Power: 0

No green key on dash, checked most fuses that I thought would be it, any specific ones I should check

 
Rep Power: 225

I would suggest getting a good battery before troubleshooting too much.

 
Rep Power: 0

Battery is good. All new grounds been chasing this issue for a week now. Motor threw a rod so I put a new one in and this started happening, all my accessories are on this motor, trans starter alternator etc

 
Rep Power: 0

Also makes some kind of hum or growl from under dash/ behind radio somewhwre

 
Rep Power: 223

Do you know how to do a voltage drop test? Might have a voltage drop in the battery terminals, I had that happen with my gfs 99

 
Rep Power: 0

I’ll try this but not sure it is it, tried multiple batteries

 
Rep Power: 223

You need to check terminals and the wires, swapping multiple batteries isn't going to do anything

 
Rep Power: 0

Put new terminals and grounds on the vehicle

 
Rep Power: 223

And?

 
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Still nothing, I done all of this before I made the post

 
Rep Power: 223

Well it's alot easier for us to help you if you explain all that in your original post.
How are the connections on the starter?
It grounds through the bellhousing and I've seen them get pretty corroded

 
Rep Power: 0

All connections seem good able to Jump starter and get motor to turn seems like a relay, communication to ecu proble

 
Rep Power: 223

If you know how to use a multimeter you can test the ignition switch

 
Rep Power: 0

I’ll try ignition switch but would that cause the fuel pump to not come on and no spark? Also no transmission lights light up on the dash. Really think there’s some relay somewhere that I just can’t find. Any better way to contact you?

 
Rep Power: 223

Well yeah that's the whole point of the ignition switch. Just keep posting on this thread that way any other members with ideas can weigh in

 
Rep Power: 0

If I read your post right. This happened after an engine swap. The most common thing I have seen is the ground at the t-stat housing.

 
Rep Power: 225

Has the car run since you put new terminals and grounds on? If not that's the first thing I'd check. Bad power or ground caused by dirt, oil, corrosion, bad crimp, or just loose.