Lost keys, tried to rig ignition with scruedriver, had to replace ignition cylinder, now all lights and radio things work but car still wont start, how can i fix this without having to go to an expens

it's a manual means my transmission is manual transmission?
with a left foot clutch ,the clutch switch is bad above the pedal clutch
that switch enables the starter relay just like all cars, manual
so you an not start engine in gear.

those other problems are other causes.
IMMO key must not be ignored. padlock
thee users guide tells you what the lamp does. (lost that?)
lost the second ignition key? from when car was new.
some cars dim HL lamps to have extra power to crank the engine, a super good features on all cars with it.
you just buy a dead car, or did it just fail out of the blue.??????????
learn what RAP is in the manual.?
key off radio works for delay10mn them or ends door open
page 2-18 in the manual

now IMMO words same manual free, to all chev. owners.
Page 2-15 actual
to start the engine closes door or IMMO Passlock
will fail.
Your vehicle is equipped with the Passlock®
theft-deterrent system.
Passlock®
is a passive theft-deterrent system. Passlock®
enables fuel if the ignition lock cylinder is turned with
a valid key. If a correct key is not used or the ignition
lock cylinder is tampered with, fuel is disabled
During normal operation, the security light will go off
approximately three seconds after the key is turned to
RUN following an engine start.
If the engine stalls and the security light flashes, wait
until the light stops flashing before trying to restart
the engine. Remember to release the key from START
as soon as the engine starts.
If the engine is running and the security light comes on,
you will be able to restart the engine if you turn the
engine off. However, your Passlock®system is not working properly and must be serviced by yourdealer.

READ
https://www.manualowl.com/am/Chevrolet/2005-Cobalt/Manual/388


but the clutch switch is failing and can be jumpered easy, your paper clip. some switches have adjustment or are just fell loose.

Sounds like your ignition cylinder failed, it'll have to be replaced, luckily you can just replace the cylinder and you don't have to replace the keys and pay for reprogramming the ignition.

I lost my only key to my 2002 Chevy Venture Mini Van. I replaced the ignition switch. I followed the directions on how to program the new keys that came with the new switch and it didn't work. Does anyone have any suggestions on what to do. Cant afford to take it to a dealership.

Pull steering wheel and replace iignition cylinder with new if won't start with every thing on then either starter and seilnoid if all in one if not then just seilnoid have some one help tap on starter and seilnoid see if starts that way if does then bad seilnoid other batt cables to starter jump it if that gets it then it's ignition switch good luck

if it is a stander pull the floor mats out of the driver side and try again

The on reason that comes to mind is that the key reader in the ignition switch is defective, they do act yup m,ore in hot temps.u

try another key. the key could be worn where read coil in the ignition switch lock cylinder and immobilizer control module and ecm dont recognize ignition key or ignition switch key lock cylinder failing.

If the battery is dead, the ignition keys will not come out of the ignition cylinder. Don't force the ignition key to ensure you do not damage the pass lock system in your ignition. Jump the battery or replace it to get enough voltage to remove the key's from the ignition and check the fuse box for any blown fuses. Good luck and keep me posted.

check fuses and change mechanics

first of all was the ignition dealer a lot of cars have a start chip built into the key if you did after market it may not be compatible with out bypassing key security chip with out the right key setup the car stays diabled