Posted on 4/28/2025
If your engine won’t start, runs rough, or keeps stalling without warning, the culprit might be smaller than you think. The crankshaft speed sensor plays a vital role in your car’s ability to run, and when it starts to fail, your engine performance can go downhill fast. Fortunately, with proper diagnostics, this problem is both identifiable and fixable. At B & L Automotive, we’ve seen how a faulty crankshaft sensor can send drivers on a wild goose chase. Here's how we pinpoint the problem and what it takes to repair it. Why Crankshaft Speed Sensors Matter So Much The crankshaft sensor tracks how fast and in what position your engine’s crankshaft is spinning. This information is essential for the engine control unit (ECU) to properly time ignition and fuel injection. If the sensor’s data is off—or missing entirely—the ECU can’t do its job, and your engine either runs poorly or won’t run at all ... read more