I changed catalytic converter/ exhaust manifold combo, now the car won't start. I reused the old O2 sensors. The check engine light is now gone. Can't figure out what the problem is. Do I have to reset the cpu? I could really use the help. Thanks

 

there must be something else wrong. simply changing the manifold would not cause a not start issue.

what exactly is the car doing? is the engine cranking? cranking slowly? not cranking at all? are all sensors plugged in correctly?

 

Car is cranking, after cranking I get the smell of gas. Sensors are plugged in properly, the wires look like there is no damage.

 

Pull the plugs and checked for spark yet?

 

ignition troubleshooting
http://techauto.awardspace.com/ignition.html

did you unplug any other sensors? map, tps, anything?