If designed properly, indefinitely.
Newer vehicle with electronic ignition probably 100,000 miles
Done correctly, indefinitely.
In the US, 1974.
all automotive plugs are electronic ignition now,unless you have a 73 or older with points. newer plugs have a wider gap than older plugs.and last longer.
Ok so you have to go where the ignition switch is at on the 1991 cougar. Next, You have to take the old one out. Last, you have to put the new one in.
Things to check are: ignition switch, manual lever position switch, ignition relay, your starter, and last, your battery. Check all wires, cables and connections for condition and cleanliness.
The knob you pull out is attached to the switch. To get the switch out, you will have to remove the panel underneath the dash, and some of the HVAC ductwork that runs underneath. Disconnect the battery. On the back of the switch, under the dash, there will be a little button you will have to push in to get the switch's shaft & knob to release from the switch. After that is done, you will be able to pull off the trim going around the face of the dash. It should just snap on. Then there will be a nut holding the switch to the dash. Remove the nut, the switch will come out the back, and then you can unplug it. Replace in reverse of these directions, only leave the swith shaft/knob for last. It will just push back into the new switch.
In my case it was the ignition switch itself had overheated and seized up. Replace the switch (have to lower the column, disconnect the wiring plug from the switch, and remove/replace the switch.) Clean all connections to the switch, make sure they're connected solidly and not heating up again.
last longer and cost less on your bill
Not to bash on the last answer, but, the starter solenoid probably isn't at fault here. If it will start with the screwdriver then the starter solenoid is functioning. It either does or it doesnt. The answer lies in circuitry back from the solenoid to the ignition switch. You could have a bad ignition switch or neutral/safety switch.AnswerDefective starter solenoid.
1. Insert a key and turn it to position 2 (dashboard lights come on BUT do not start car!!!) four times in 6 seconds 2. Switch off the ignition - a tone should sound to indicate it is now possible to program keys 3. Press any button on key - a tone should sound as confirmation 4. Repeat step 3 for ALL keys 5. Switch ignition to position 2 OR wait for 10 seconds to elapse after last key programming
Energizer batteries last the longest for electronic games. They last 20 hours or longer.