LS7 starts and then dies
Thread Starter
Launching!
Joined: Jul 2004
Posts: 223
Likes: 0
From: Potomac, MD
LS7 starts and then dies Could anyone point me in right direction on this. I reflashed ECM (E38) with a stock tune that had different OS. Engine seems to start normally but dies almost immediately.
Any thoughts?
thanks
Any thoughts?
thanks
They should be set to "non-emissions".
This could cause your start and die scenario. But so could a bad fuel pump. Do you have a way to check fuel pressure?
Do you still have the MAF hooked up?
Thread Starter
Launching!
Joined: Jul 2004
Posts: 223
Likes: 0
From: Potomac, MD
I was thinking maybe a VATS issue. I did turn it off and applied the patch in EFILIVE.
This happened when I reflashed completely to a new Gm OS. The only stock ls7 tunes in efilive repository had an incompatible OS with my ECM.
Does an enabled VATS allow car to crank and start briefly f correct keycode is not supplied?
thanks for help.
This happened when I reflashed completely to a new Gm OS. The only stock ls7 tunes in efilive repository had an incompatible OS with my ECM.
Does an enabled VATS allow car to crank and start briefly f correct keycode is not supplied?
thanks for help.
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Yes it will allow it to crank and then die. Some people have to put power to the cranking voltage on the pcm itself too, not sure what pin that was, but it is labled cranking voltage.
If it dont work try changing the vats type to 1, 2 or 3. usually 3 works the best. Also, did you check for codes being thrown? that might give you a clue.
Or send the tune over to me and i can check it to make sure it is valid.
If it dont work try changing the vats type to 1, 2 or 3. usually 3 works the best. Also, did you check for codes being thrown? that might give you a clue.
Or send the tune over to me and i can check it to make sure it is valid.
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Launching!
Joined: Jul 2004
Posts: 223
Likes: 0
From: Potomac, MD
Thanks very much wait4me. I didnt realize there were different VATS types, so I'll try that. Appreciate your offer to look at my tune, I'll take you up on it if switching VATS types doesnt work.
Appreciate the help!
Appreciate the help!
