LB7: LB7 No start, Need help!

[ACiFiC]

Hey all, duramax starts runs and then dies basically immediately

was going to wire up my boost gauge (didnt even bother after this)

Use to have a BT diesel automatic high idle that i couldnt get to work (ages ago) that i had just cut out when i removed it.

i accidently touched one of the wires against the steel under need the column and it made a spark then and now the truck wont start

dash lights also wont come on, i checked a bunch of fuses but im not sure what im missing, any ideas?

here is a video

http://www.youtube.com/watch?v=yIfeBbaUlGw


And I think these were the wires

read back on the instructions and "NOTE: YOU MUST USE A POWER SOURCE THAT IS “HOT” DURING “RUN” AND
“CRANK”. (ie, a power source that does NOT momentarily shut off when the key is turned to
start) A known-good location to tap into an ignition-hot source that is hot in RUN and CRANK, is
at the BCM. Locate the 24-pin LIGHT BLUE connector on the BCM."

but i honestly cant remember where this one went, it goes up to the column and yeah. guess i shorted it out.

not sure if this would help

is fuel being cut from the security system or something like that?


thanks

 

[bluecollar]

Double check all the ignition fuses and for sure ur ecm b fuse as im not sure how/what the bt idle box connects to.. i have the diy high idle mod works just fine

 

[ACiFiC]

Double check all the ignition fuses and for sure ur ecm b fuse as im not sure how/what the bt idle box connects to.. i have the diy high idle mod works just fine

Which is the ECM b fuse? Or where is it found? I would think the ignition fuses are probably good because it starts and runs then dies

 

[bluecollar]

Well if it starts and dies ur right on it most likely not being a fuse

 

[catman3126]

Check the EDU fuse under the hood too it can cause a no start. Probly not it but rule it out.

 

[ACiFiC]

Unplugged the batteries for 10 min and now it runs, thanks everyone!

 

[ACiFiC]

Nevermind it's still doing it

 

[ACiFiC]

So I've disabled the security using the ppe xcelerator but for some reason it's still kinda goofy.


What causes the DLC and CEL stuff to disappear until you start it?


Did I fry the ECM? PCM? BCM?

Something I'm over looking?

 

[S Phinney]

I would check all ignition fuse places on the underhood fuse block. Mine did it several years ago and it was one of the prongs in the block making intermittent connections. When it lost connection it would disable truck kinda like the ECM thinking it was being stolen. Best way to check probably would be leave the door open with key in so the chime works and wiggle the fuse to see if the chime changes sounds or speeds. It was simple to use a pick and move the prongs for better contact. What was funny was that it had never been taken out before.

Sent from my XT1080 using Tapatalk

 

[ACiFiC]

Jesus, can't believe I missed it, was just an ign fuse, lol was barely blown by looking at it

 

[bluecollar]

Glad you got it :thumb: