Wth is wrong wih my vt.car sometimes starts but wont idle or rev & more issues!??

[VTLS1]

Vt ls1 auto starts sometimes then cuts out other times it just wont start at all??
Hey all,well tried the google is my friend but cant seem to find anything relating exactly to my problem....unless me going blind. The issue is this: VT LS1(Not that i think the engine size is an issue) auto,every now & then when you jump in it,hot or cold you would turn the ignition on & nothing. Dash lights etc come up but,she no turn over. Turn it back off,pull key out & try again,then after either doing it once or a few times she would turn over again but,either cut out again after firing or idle as normal. Sometimes i would turn the key around a few times,to try different positions etc. I also have slightly moved the rubber dohicky around the ignition barrel,just in case the pin on the key wasnt making there connections correctly. But still nothing. Recently it came up with service error but i reset that & cleared it. Also removed console & checked all earths,unpluged bcm,waited & replugged back in. Done the same with all necessary fuses etc as per all given recomendations found that may possibly linked in some way. At this point in time the vehicle not long after stopping the car,just after the service error thingy came up it will now only either turn over & start but cut out immediately or just give me nothing when i turn it over. So what the heck is the problem?? Only things left to think of is to either just change the igntion assembly or get another bcm & key head.,

[Rusty]

That was a lot to read.

Maybe check fuel pump, starter motor, battery, dizzy and rotor, leads and sparkplugs.

I'm no mechanic but they may be worthwhile checking. Do you have a way of checking error codes like the older vr's etc?

[VTLS1]

yeap,got have your weet bix to read it. fuel pumps out,reason is the car just turning on & nothing,dead. have dash lights but no turn over. then remove key & try again,then it may start & idle or start then cut out. so its something,to me anyway somewhere to do with the ignition or bcm side of things. gone through the whole car & checked every earth & wire connection i could think of. its go me buggerd six ways of sunday

[MrSirWantalot]

Might be worth having a look at the Immobiliser

[bhopper]

I am having the same problem with myn i just swap my whole body loom over for climate control conversion and i had bcm,pcm,and keyhead i am guessing the keyhead is on her way out and not sending the code to bcm so might need a new set of keys ,how long you had car and if you have had it for 4+ yrs i am guessing it would be keyhead. Sometimes my goes to start for couple seconds but just dies so i pull the key out and puch unluck again and mostly works 1st shot ,i am going to do a set of keys so i will see how i go.