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starting problems after weight reduction head and cam

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Old Aug 3, 2012 | 09:15 AM
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Default 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

Last edited by lsxTAlemy; Aug 8, 2012 at 07:41 AM.
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Old Aug 3, 2012 | 10:07 AM
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have you tuned it since the head cam swap it sounds like to me thtas the problem
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Old Aug 3, 2012 | 10:15 AM
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Originally Posted by dodson55
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.
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Old Aug 3, 2012 | 10:23 AM
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VATS...if your tuner can't tune it out, it's time to find a new tuner.
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Old Aug 3, 2012 | 10:36 AM
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VATS would also be my guess! Get it tuned!
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Old Aug 3, 2012 | 10:40 AM
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Originally Posted by bww3588
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.
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Old Aug 3, 2012 | 11:52 AM
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Maybe the correct forum would get some responses???
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Old Aug 3, 2012 | 11:55 AM
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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
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Old Aug 3, 2012 | 12:04 PM
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Same injectors?
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Old Aug 3, 2012 | 12:08 PM
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VATS will let it start then immediately die.
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Old Aug 3, 2012 | 12:13 PM
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Originally Posted by mkvamso
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.
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Old Aug 3, 2012 | 12:21 PM
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spoke the the tuner and he told me h didn't want to by pass it so i can still have an alarm
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Old Aug 3, 2012 | 12:22 PM
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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.
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Old Aug 3, 2012 | 12:35 PM
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is there any other way. tuner is book till late next week honestly im dieing to it run
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Old Aug 3, 2012 | 12:40 PM
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You can bypass the system with the correct ohm resistor.
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Old Aug 3, 2012 | 12:54 PM
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i have ohm reader to read key. radio shack would have it .
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Old Aug 3, 2012 | 12:58 PM
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VATS will let the car start and then die.
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Old Aug 3, 2012 | 01:00 PM
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Originally Posted by lsxTAlemy
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.
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Old Aug 3, 2012 | 01:01 PM
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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.
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Old Aug 3, 2012 | 01:14 PM
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It's a very common problem on these cars.
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