If you’ve watched your gas mileage slip downwards over the course of a few years, you may want to see a mechanic about the problem, but it’s not your ECM. Now, this isn’t typically a problem that happens slowly over time. Sudden Drop in Fuel EconomyĪnother way that your fuel-to-air ratio and engine timing affect your car’s performance is in the realm of fuel economy. Either way, it’s possible that your ECM is causing the problem. Similar problems can be caused directly by an improperly-adjusted engine timing. Your Engine Stutters or MisfiresĪ rich fuel-to-air ratio can cause your engine to misfire, while a lean ratio can cause stuttering when it periodically fails to ignite. Hiccups during startup, or having to turn the key half a dozen times to get the engine to turn over, are a sure sign of engine trouble, and a possible sign that your ECM is to blame 3. If your ECM is setting the ratio incorrectly, this is the first time you’ll notice. Your engine is never as finicky about fuel-to-air ratio as it is when it’s first starting up. But if it’s happening along with one or more of these other symptoms, you may have a problem with your ECM 2.
Now, a check engine light by itself is no reason to worry.
But sometimes, it means that there’s a problem with your ECM. Oftentimes, it ends up meaning nothing more than that some oxygen sensor or tire pressure sensor is on the fritz. Your car’s check engine light is a sort of catch-all that many people ignore. For this reason, ECM failure symptoms actually lead to a broken sensor or faulty wire, rather than failure of the ECM itself. In order to have the information it needs to do the job effectively, your ECM relies on information from dozens of sensors. Managing all of these functions is a lot of work. It also shares vital data with the PCM and the TCM, which control the shifting, anti-lock brakes, and traction control systems. This includes managing the fuel-to-air ratio and engine timing, which are its primary functions. Your ECM is responsible for making constant, on-the-fly adjustments to your engine. These ECM failure symptoms can be your first warning of serious engine trouble, so it’s important not to take them lightly. Today, we’re going to take a look at the most common signs of ECM failure. Nowadays, those functions are controlled by three computers: Gone are the days of adjusting your timing belt or setting your own fuel-to-air ratio. These days, it’s impossible to maintain your car without a good understanding of its computer systems.
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