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Help new 4l80e is in now truck wont start

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Old 03-27-2012, 03:25 PM
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Originally Posted by 03regcab sierra
Have u replaced the bcm? Im gonna try that this week hoping to solve my problem
Not yet. I am in need of a gm tech to help me out.

Originally Posted by smokeshow
Which relays?
lets see, iirc run/crank starter, a/c compressor, fuel pump. I did put them the way they were sopposed to go but still no start. I talked to a gm electrical tech and he said the relays would wotk any way if they are the 4 prong type which in my case they were so...
Old 03-27-2012, 03:40 PM
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Originally Posted by chris092183
I talked to a gm electrical tech and he said the relays would wotk any way if they are the 4 prong type which in my case they were so...
Was that a tech at the dealership...? He is incorrect, relays need to be installed a certain way or they won't work. If they were installed backwards with power applied, it would put a load on the coil and probably burn it up. The coils aren't meant to take a lot of current. I would double check everything in your underhood fuse box. Verify the relays are working, too.
Old 03-27-2012, 03:42 PM
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I have a gauge for that
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All of the relays in my underhood fusebox are installed upside down, not sure if the diagram is backwards or what...seems odd...but everything works.
Old 03-27-2012, 03:49 PM
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Originally Posted by Atomic
All of the relays in my underhood fusebox are installed upside down, not sure if the diagram is backwards or what...seems odd...but everything works.
Upside down, that is odd. The pins should be facing down. Weird.
Old 03-27-2012, 09:56 PM
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Originally Posted by smokeshow
Was that a tech at the dealership...? He is incorrect, relays need to be installed a certain way or they won't work. If they were installed backwards with power applied, it would put a load on the coil and probably burn it up. The coils aren't meant to take a lot of current. I would double check everything in your underhood fuse box. Verify the relays are working, too.

yeah he works at a dealership. He is a freind of a friend. Apparently he has been doing this for 20 years. IDK. I put them in the direction they are sopposed to go but still no start. I tested all the gry relays. I didn't test the black relays.

Originally Posted by Atomic
All of the relays in my underhood fusebox are installed upside down, not sure if the diagram is backwards or what...seems odd...but everything works.
I HAVE SEARCHED IMAGES for the correct way the relays go. alot of images dn't match up with images from other trucks of the same year.


I wish i knew a tech that works at chevy who could get my truck in without any problems as it's still under warranty and I am a broke ***. PM me if you know any techs who can do the warranty work. If not I'm gonna have to save up and sell more **** which is gay cause this is my only transportation other than my bike and the gf.
Old 04-16-2012, 08:32 AM
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Well I finaly figured out my problem. It was a torn ground wire! After sitting for 3 months im finaly enjoying my truck again with the new engine..
Old 04-18-2012, 05:17 AM
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And finally the mother ****** runs. It was the bcm. I went through hell trying to find someone with the software to get it running.

The 80e shifts pretty damn nice. It is way better than the last one. I guess I did a good job. Now That I know it works. time to resave up for a Circle D-- effin taxes.


I am prolly gonna through the wideband in tomorrow.

well **** i'm pooped. I'll throw more input up tomorrow.
Old 04-18-2012, 10:20 PM
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Truck is finally running. The transmission shifts pretty damn nice. Way better than the other trans I had. It chirps 1-2 at about 1/4 throttle. Now I need to look into traction. I did a few test runs and it just kept spinning
Old 04-22-2012, 01:26 AM
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good stuff here, I'm having issues with a 4L80e conversion in a TBSS
Old 04-26-2012, 10:42 PM
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Well at least your in the heartland where everybody lives. There are very few member out here in cali. You shouldn't have a problem getting some help out there.
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