Having trouble starting car..when it sits after an hour the car starts..I have replaced the computer system b c they thought it was the anti theft locking me out from starting it now it wont start at all unless it sits for an hour

A nice simple answer, you can't. Think of it this way, the car doesn't know you are the owner, and it is there to stop exactly what you are trying to do. You have two computer ECM and BCM, plus the antitheft module and a number of sensors all trying to stop you. All you have to do is the re-learn procedure. Plan B is an auto electrician or alarm / radio installer or auto locksmith.

30 Minute Re-Learn Procedure

1. Turn ON the ignition, with the engine OFF.
2. Attempt to start the engine, then release the key to ON (vehicle will not start).
3. Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF.
4. Turn OFF the ignition, and wait 5 seconds .

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Nov 11, 2011

2006 Chevy Cobalt: theft..crank..the dash lights..battery light

How do i perform the 2006 Chevy Cobalt anti theft system ...

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Jul 16, 2020 - To perform a reset of the 2006 Chevy cobalt theft system, turn the ignition key to position and wait for approximately. 10 Minutes and the ...

5 answers · Top answer: To perform a reset of the 2006 Chevy Cobalt theft system, turn the ignition key to position and wait for approximately 10 minutes for the flashing anti-theft ...

How do I reset my 2005 chevy cobalt anti theft system?

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Apr 9, 2020 - Perhaps the simplest is to disconnect the negative battery terminal, let it sit for 15 to 30 minutes, and then reconnect. However, some anti- ...

8 answers · Top answer: There are a few things You can do to reset the anti-theft system on the 2005 Chevrolet Cobalt. Perhaps the simplest is to disconnect the negative ...

Won't start, theft lock symbol on - Cobalt SS Network

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Jul 9, 2008 - To reset it, you need to stick the key in, turn it to start, and let the key sit in the ON position for 10 minutes, the light will start to ...

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Question edited for clarity, typos and words that are incorrect 'automator' to 'alternator'.
Question moved to model category.

Put a battery charger on it for at least 8 hours on 6 amp charge. Make sure the battery ground has a good contact using a digital multimeter. After 8 hours, start the car and run it.

Next day, try and start again. If the battery is flat, you have parasitic draw.

https://www.fixya.com/cars/r29903527-parasitic_draw_car_batteries

One further thought, does this old vehicle have a security system and engine immobilizer? Do you have a steady or flashing red light anywhere. You may be locked out of starting the engine because you disconnected the battery. In fact Goggle says it does have anti-theft.

1995 f150 theft light flashing, cannot start!

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It's easier than you might think. In most cases, the anti-theft system on a Ford F-150 can be reset by turning the vehicle to "accessory" mode and leaving the key in the ignition for several minutes until the anti-theft light shuts off.

Feb 10, 2021

Ford F-150: Resetting the Anti-Theft System - VehicleHistory

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Tampering with the anti-theft system can lead to damage to the vehicle or may even be *******. If you have lost your key or are having trouble starting your vehicle due to the anti-theft system, it is recommended that you contact a professional locksmith or a Ford dealership for assistance. They may be able to help you get a replacement key or repair the anti-theft system to allow you to start the car. It is important to follow proper procedures to ensure the safety and security of yourself and your vehicle.

Taking the vehicle to a qualified repair shop that has the diagnostic tool to read the DTC'S - diagnostic trouble code's . Then they can diagnose the problem . None of the thing's you tried will work , not for anti-theft systems , not suppose to. The computer isn't seeing the correct transponder code or the anti-theft module is the problem . Having the vehicle checked by a qualified service tech is the only way to resolve your problem .
Ford's PATs - Passive Anti-Theft System Information. Permalink
Many Ford trucks, vans and suvs use PATs (passive anti-theft) keys. These keys prevent someone from copying your key to a blank and using the blank. There is a small chip in the key which the vehicle must recognize before it will start.
PATS is Ford Motor Company's passive anti theft system. In 1996 it started showing up on select models of Ford and Lincoln Mercury vehicles. The keys for these vehicles have a tiny radio frequency transponder imbedded in the plastic Head.


When you attempt to start the vehicle, the onboard computer sends out a RF signal that is picked up by the transponder in the key. The transponder then returns a unique RF signal to the vehicle's computer, giving it the ok for the vehicle to start and continue to run. This all happens in less than a second, and is completely transparent to the vehicle operator. It is a very effective system that does its job without the vehicle owner having to think about it, or modify his / her usual routine.

No you cannot by-pass the anti theft system.

Sometimes if it set too long the gas went bad. You may have to drain the gas and the put fresh gas in.

The first thing to do get it checked for DTC'S - diagnostic trouble codes . Not at auto zone or any other parts store , you want to have full scan of all the modules on the car. Don't know how much you know about automotive electronics , computer controlled systems etc.... Your vehicle has at least 10 modules (computers ) on board , there all talk to each other on a serial data network . C.A.N - controller area network . Or in the case of GM it has it's own . GMLAN -
How to Diagnose Controller Area Network CAN When you turn that ignition switch to start it is an input to the computer ,be it the PCM or BCM ..

it does sound like the anti-theft system. There are only 2 ways to bypass your problem. 1) disconnect the anti-theft system which runs into your ignition, cut the wires to the system and join them back together without hooking it back up to the anti-theft. 2) Bring it back to the dealer so that they can replace your anti-theft sensor. The part is rather cheap but the labor is the killer.

no cutoff switch!! try this turn key to on, do not start car. let sit for about 30 minutes, after 30 minutes, turn key off. wait 15 seconds and try to start car. this should reset anti theft system.

Some months ago I began starting the engine of my 2001 Chrysler 300M but turned it of before it really started "was sloppy with the key". The anti-theft system went on for some unknown reason. I disarmed it by disconnecting one of the battery connections under the hood with a wrench. I connected it again, the anti-theft system was off but the battery was dead. Battery was OK after recharging, I have had no trouble since then.