It can cause the RPM to be so low at idle that the engine will die. The throttle body can affect the RPM the other way also. You can calibrate the throttle body with most diagnostic scanners. If there is a problem with the throttle body, it may cause the RPM to be way too high.Ī throttle body that isn’t calibrated can also cause this. The throttle body controls the engine’s idle to make sure it is always holding a steady RPM. Misfires are easily recognized as small bumps when you are revving the engine. Misfires represent incomplete combustion inside the combustion chamber.Īs we told you before, a bad throttle body can mess with the air/fuel mixture, and it can also cause your engine to misfire. Misfires occur either when the air/fuel mixture is very wrong, or when the spark plug produces a weak spark. If you notice that your car has a very uneven acceleration – sometimes it is fast and sometimes slow – you might have a bad throttle body. This means that a faulty throttle body can mess the air/fuel mixture up, which will cause problems when accelerating. The throttle body also regulates the air/fuel mixture that enters the engine. The car engine is most sensitive at idle, where you will notice symptoms of a dirty or bad throttle body first. If you notice your car’s engine idle is jumping up and down and making strange sounds, it may be due to a dirty or damaged throttle body. The check engine light also comes on due to several other reasons, which is why we recommend visiting an auto specialist and having the car scanned for any trouble codes when it pops up on your dashboard. As soon as the car’s onboard computer detects a problem with the throttle body signal, it will cause the check engine light to illuminate. The throttle body has some angle sensors and other sensors installed inside of it.
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