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Did you try jumping it?

Ok. The Monte Carlo DOES NOT NEED JUMPED! Like stated above the LIGHTS/RADIO/EVERYTHING Turns on just fine. Battery is fine, We've tested the starter and wiring, battery connections are fine. It starts just fine any other time. Once in awhile you turn the key and it doesn't do anything except for turn on lights/radio/etc....It has to be something in the ignition. Neways I think we've figured it out.

Does your ignition key have the little black chip in it? If so make sure the metal contacts on both sides are clean and before you put key in ignition ensure chip is centered in key. GM made a security feature to make it more dificult for a car thief to start engine, and your car's computer uses the value of the resistor inside the little black chip in key to ensure it is the proper key for the car.

Yeah it has that chip in the key mold and the ignition apparently. We are thinking that's the entire problem. I don't know how to ensure it's centered though.

I'm not sure what year they switched the style of key, but I'm referring to if there is the chip built into the metal part of the key not the rubber handle (where you can see the chip). It was somewhere around your cars year they switched it. Also check if there is power going to the starter relay next time it happens, you can also swap it with another relay to check the relay. And check if there is power going to the S-terminal on starter if the relay functions properly.

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13y ago

What else can I help you with?