Chevy Lumina Security Light On and Won't Start

1997 Chevy Lumina security light.
Repair done prior = We replaced the key for the ignition a couple of years ago. Question = Why is the security light on and it won't go off. The car starts and works fine.

Aanswer:
A common cause for a security light on this vehicle is a faulty ignition cylinder. There are 2 small white wires on the cylinder inside the steering column that sense the chip in the key. One or both of these wires break, and cause this light, and eventually a no start condition. I will send a link to a page in our site that shows this....

I have a problem with my 1997 Chevy Lumina that I can't get started.

I can turn on the key, all the lights are on, but when I try to engage the starter it does nothing and the headlights blink off. I can jump the starter with a screwdriver and the car will start but immediately shut off. I'm thinking it's a key code problem, but have tried two different keys.

I tried to rent a code reader but they told me the car needed to be running for it to read codes. Please help direct me in the right direction as this is the wifes car and it's been down a couple of weeks and she's screaming'! Any help is greatly appreciated. Thanks a million and GO 24!!

Answer:
Sounds like a security issue. That system has a common problem with the Passkey ignition key cylinder. There are two small wires that attach to the cylinder and read the key code. Those wires break. Just trying a different key wont help, it needs to be the correct security number. That number can be read from a tool at the dealer.

The way to check if the passkey ignition cylinder is bad, is to go under the dash and check the resistance of the 2 white wires with the key in the ignition. Use a volt/ohm meter to check the resistance of the circuit. If an open circuit, then the cylinder will need to be replaced. Not sure how knowledgeable you are with cars, so you may want to take to a repair shop.
P.S. I am a #3, #8 fan Sorry !

1993 Chev Corsica Engine size 2.2L 4 cyl.
Question = The engine has a knock that sounds like a rod knock. It only knocks after the engine is warmed-up...and at idle (waiting on a traffic light)... Otherwise, the engine runs great, both at highway speeds, and at idle. No oil pressure light showing, or any other oddities... Where would you go first? I haven't hooked-up a manual gauge, yet, to see if it actually is going low at idle.

Answer:
Well considering your car is 20 years old, and it is a knock and not a top end tick, then the engine is just worn out. The noise you have could be a bad main bearing, rod bearing, worn piston rings or wrist pin, etc. Check the oil pressure with a gauge. If it is more than 10 PSI at idle when hot, then either live with it or take the engine out and tear it down, inspect for worn parts and replace as needed.