Will disconnecting battery Turn off engine?
In theory, if your alternator is providing adequate power to the car while charging the battery, then once the car is started, disconnecting the battery should not cause the engine to stop running. …
Can a battery make a car run rough?
Even though it won’t happen directly, a weak car battery can cause a car to run rough. A car engine finds it hard to idle when the battery is dying. It can even force the engine to stall. If you have a weak battery, the alternator won’t be able to fully carry out its function and that’s why your car may run rough.
Can a car battery be disconnected while the engine is running?
Battery voltage MUST be maintained to the (PCM) and other modules; while the battery is disconnected. NEVER : disconnect the car battery; while the engine is running or the ignition key is turned on. Automotive Car Battery With Negative Cable Removed
Do you have to relearn idle when a battery is disconnected?
Many newer cars with powertrain control modules (PCMs) have to relearn engine idle after a battery is disconnected. The removal of electrical power from the engine erases idle memory from the PCM, the computer where it is stored.
What happens to the engine after replacing the battery?
After replacing the battery, the engine idles very rough and will die with the air on. My car has 225000 miles. My car has an automatic transmission. You will need to re-learn the idle for the vehicle to get it to idle high enough. You should first clean the throttle plates and throttle body and idle control valve.
What happens when the battery is disconnected on a Toyota?
When the starting battery is disconnected on late model Toyota and Lexus vehicles the engine control module loses the learned position of the idle air control valve or throttle actuator motor (throttle-by-cable or throttle-by-wire, respectively).