The crankshaft position sensor sends these measurements to the ECM, and the ECM uses them to optimize the rest of your vehicle’s timing. It might sound redundant, but it’s one of the most critical sensors in your vehicle. The purpose of the crankshaft position sensor is to measure the position of the crankshaft. RELATED: 6 Symptoms of an Engine Misfire Crankshaft Position Sensor Function If you have a misfire, get repairs as soon as possible. The longer you let a misfire happen, the worse it’ll get, and the more expensive the eventual repairs will be. Even worse, if you have an engine that’s misfiring, it’s only a matter of time before engine damage occurs. While it’s unlikely that a vehicle with a check engine light on will misfire, if the ECM uses incorrect positions of the crankshaft, it becomes incredibly likely. Typically, it will take a while for a problem to get this bad, and if it is, there’s a good chance there’s further damage that you’ll uncover after you replace the crankshaft position sensor. This happens when the ECM is sending all the wrong fuel and ignition timing to each cylinder. While this indicates a severe fault, it’s possible that a faulty crankshaft position sensor could lead your vehicle to stall. Instead, it’s a problem when the crankshaft position sensor is feeding inaccurate readings and your ECM doesn’t realize it. Moreover, it’s not usually a problem if you have a check engine light and the ECM has defaulted to predetermined values. This is usually only a problem when the problem has persisted for some time, and you likely have multiple other underlying issues too. Furthermore, you might have difficulty keeping it started. If your defective crankshaft position sensor is extremely out of sync, you might have trouble getting your vehicle started. Keep in mind that an engine that isn’t performing correctly is also going to have a reduction in fuel economy, but unless you’re paying close attention to how many miles you get out of each tank, you might not notice. Top speed and acceleration are the two most significant areas in which you are going to see a reduced performance. Whether it’s default values or the wrong values entirely, anything less than optimal timing is going to reduce your overall performance. Whether you have a check engine light or not, a faulty crankshaft position sensor will lead to reduced engine performance. If the ECM doesn’t time things correctly, you’re in for a bumpy ride.Įven worse, the problem is only going to get worse until you fix it, and it’s only a matter of time until further damage occurs. Even worse, it might be utilizing incorrect readings to determine fuel and ignition timing. If your engine has a faulty crankshaft position sensor, then it isn’t optimizing any performance. However, the longer you leave the problem unaddressed, the worse it will become. While this might cause a few performance issues, it should help prevent further damage from occurring. The good news is that if you have a check engine light, then your ECM has reverted to default measurements. As I said before, the most common symptom of a bad crankshaft position sensor is a check engine light.
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