Computer will not self test sometimes and car will not run
When trying to start car after running check engine lite will not extinguish but stays on. Car will start after check engine light goes off, after self test is complete. Also transmission "D" light flashes. It does not matter how long car is shut down, car does not have igntion power to coil also. I'm leaning more to a faulty ignition switch becasue the car has over 200k miles.
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Yes you can run the engine without the sensor, maybe. When you disconnect the sensor the computer uses a signal or number preset in the computer memory. Sometimes the engine will run and sometimes not, but it won't do any damage either way. A mechanic would test the sensor by using a meter and a vac pump. The sensor measures engine vac. You could always try a used part.
This is usually caused by a faulty alternator.
It stays on because the alternator is not generating sufficient voltage on the control winding to extinguish it.
Check battery terminal voltage while motor running with headlights on or blower fan running.
Terminal voltage should be approx 14.5V.
Ensure alternator and engine are properly connected to ground and the battery negative terminal.
Your vehicle’s computer system has self-testing capability. When the computer senses that there is a problem with one of the components or sensors it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and you need to diagnosed and repaired it. The list of possible codes number in the hundreds. The code itself doesn't tell exactly what component is defective - it only indicates where to look, or what engine parameter is out of normal range. You or a technician will have to perform further testing to pinpoint cause and the proper repair. Even if you reset the light, if the underlying problem is not addressed it will come back on. If the vehicle runs it's test and finds the component or sensor passes the test for three consecutive tries it will turn off the light, but store the code in memory. This maybe what is happening to your vehicle.
maybe try replaceing the ingnition modual. that part can do a lot of weird things to these cars. its located inside the distributor cap, really easy to do. about $40 and 10 mins or less. sometimes as they start to fail they do odd things sometimes but not always
If you disconnect the battery for 1 minute and reconnect it the check engine lite will reset. when you start your vehicle again the lite shouldn't be on unless the problem is still present. If the problem is still there the lite will come on again and you should take it in to a shop and have it diagnosed for engine codes and see what the problem is.
Try disconnecting the battery first though before you go spending great amounts of money on something that was probably just a minor glitch in the computer.
Bets of luck and let me know if this has helped you.