How can I fix a crank no start problem on 2005 Chevy Impala 3.4L

Hello, what o-ring are you speaking of? What is leaking very bad? Engines need: -consistent fuel delivery to the engine -consistent ignition spark -the proper amount of air to the intake manifold -exhuast flow that is without restriction -emissions controls systems that work as designed -engine compression strong among all 6 cylinders -engine timing correct With all that and no anti-theft system influence, your engine should run. It's a matter of finding out what isn't present as needed. Then, why that is. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops