General Maintenance & Repairs - starting problems after weight reduction head and cam

hey guys i just stripped the car took out dash to take out all the ac suff. brought the motor down for head and cam swap 241 ported ms3. mostly every thing is back on the car except power steering ac compressor and all the other ac stuf. the ground under the car on driver side is on. the both tower ones on pass are on. the three behind the head on driver side on, and the ones on each corner on the dash are on. all fuses are good everything looks good.

now when i hit the key motor fires, but doesn't stay on. it fires for about a sec and dies. i have fuel pressure and obviously have spark. i have tried holding the throttle slightly open to see if it will rev but no luck at all. one thing we think might be the problem is the factory alarm. the light is blinking tried unlocking the car with the key and nothing. my tuner told me that it might be the alarm and that he can disarm it with his tuner.

what do u guys think might be the problem im pulling my hairs out here.

thanks in advanced

problem solved last page is the answer here's the vid

http://youtu.be/5U3TFq__wwU

have you tuned it since the head cam swap it sounds like to me thtas the problem

have you tuned it since the head cam swap it sounds like to me thtas the problem

well i had a tune for the stock head cam nitrous set up. but i haven't tuned for the new heads and cam. iv seen most people just getting and starting the car untuned. they just hold the throttle slightly. fires and dies right away id thought sense if fires i would be able to keep it alive with the throttle.

VATS...if your tuner can't tune it out, it's time to find a new tuner.

VATS would also be my guess! Get it tuned!

VATS...if your tuner can't tune it out, it's time to find a new tuner.

vats??? what is that. im pretty sure he can he did my previous tune open loop speed density.

Maybe the correct forum would get some responses???

i have never seen vats on a fbody make it start then die they usually wont crank at all or if they do crank they will never start

Same injectors?

VATS will let it start then immediately die.

Same injectors?

yes same stock injectors, but when i open the door the alarm light starts flashing. then i close it and it stops. the security light come on when i hit the key and then it cranks and dies on the spot. some times it doesn't crank at all.

spoke the the tuner and he told me h didn't want to by pass it so i can still have an alarm

Does the security light stay on with the key in the on position? If so have your tuner turn off the VATS (anti-theft system) as others have stated.

is there any other way. tuner is book till late next week honestly im dieing to it run

You can bypass the system with the correct ohm resistor.

i have ohm reader to read key. radio shack would have it .

VATS will let the car start and then die.

i have ohm reader to read key. radio shack would have it .Yes, Radio Shack will have the resistor(s) & they should be able to ohm your key as well.

is this known to fail from one moment to the other? it had never gave me a problem before just now that i took the dash off.

It's a very common problem on these cars.

damm so that means ill be left without an alarm ?? i just took a clifford g5 off it

well ill take a ride with the key so they can read it and give me the one i need. thanks guys for the help ill post up if this resolve my problem.

The alternative would be to go spend about $100 or more on a new lock cylinder & key.

ok guys i found the remote for the car. i armed and disarmed the alarm for the car. i set off the alarm and put the key in ignition and it stopped. so obviously its reading the key and im guessing it working right. u guys still think it the same thing ?

what connections are around the starter? my brother took a look and said there are some connectors loose around that area. is there any sensor around there that can cause this problem?

well, i got it guys! it was the guy that uninstalled my alarm he put the starter wire to ignition and ignition to the starter. that's why it would only fire when the switch was on's thanks guys for the help...

watch the vids show some love. posted in the first page.