LS427/570 Startup issue
Thread Starter
Teching In
Joined: Oct 2022
Posts: 10
Likes: 1
LS427/570 Startup issue Hi everybody. I have been watching here for a while and since I am currently trying to finish up a Pro Touring Firebird build with an LS427, I figured it is time to sign up and see if anyone here can help me solve my problem.
I have the GM LS427/570 engine with the 6L80 transmission connect and cruise package in my 70's Firebird. I am not a tuner, and I bought the package so I wouldn't have to get into software tuning and diagnostics etc.
I have everything connected and can start the engine on the key, but it cuts out immediately. I wondered if it was fuel pressure, but if I leave the starter engaged (accidentally) for an extra second, the engine keeps running, and will blip on the throttle, until I release the key back into the regular run position. It feels to me like the power is turning off as soon as I release the key. I have tried swapping the pink wires (Painless wiring kit with an Ididit column) but to no affect. It feels like the power sent to the unit is good when I engage the starter, but shuts off when I release the key. I have checked and double checked my grounds.
I read that it could be VATS, but why would GM program the connect and cruise package with VATS when it is supposed to be factory setup to run its a stand alone system in old vehicles, and I have no way to check or deactivate that system.
Anyone have any experience of this?
Thanks. Trev.
I have the GM LS427/570 engine with the 6L80 transmission connect and cruise package in my 70's Firebird. I am not a tuner, and I bought the package so I wouldn't have to get into software tuning and diagnostics etc.
I have everything connected and can start the engine on the key, but it cuts out immediately. I wondered if it was fuel pressure, but if I leave the starter engaged (accidentally) for an extra second, the engine keeps running, and will blip on the throttle, until I release the key back into the regular run position. It feels to me like the power is turning off as soon as I release the key. I have tried swapping the pink wires (Painless wiring kit with an Ididit column) but to no affect. It feels like the power sent to the unit is good when I engage the starter, but shuts off when I release the key. I have checked and double checked my grounds.
I read that it could be VATS, but why would GM program the connect and cruise package with VATS when it is supposed to be factory setup to run its a stand alone system in old vehicles, and I have no way to check or deactivate that system.
Anyone have any experience of this?
Thanks. Trev.
