Why does my car rev up and down at idle?
Over time the throttle body valve can become dirty which can allow the throttle body valve to stick or not open/close all the way which can cause your car’s engine to rev erratically and can cause the engine idle to bounce up and down.
How does the idle air control valve work?
The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage.
What should I do if my car idles for no reason?
Replacing a vacuum hose is typically inexpensive because it’s just a small piece of rube hose. The bad news with a vacuum leak is that it can sometimes be tough to track down which hose is causing the vacuum leak. You may have to perform a smoke test or spray carb cleaner onto your vacuum lines to listen for a change in your engine idle speed.
Why is my car revving up and down?
Another reason for a rough idle or your car revving up and down on its own can be a plugged EGR valve. Your EGR valve is connected to your EGR (Exhaust Gas Recirculation) system which was developed to help manufacturers pass ever-increasing emissions standards.
Over time the throttle body valve can become dirty which can allow the throttle body valve to stick or not open/close all the way which can cause your car’s engine to rev erratically and can cause the engine idle to bounce up and down.
The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage.
What happens when the Idle is high on a Harley Davidson?
Strange that there are no historical codes since you did say you saw the check engine light come on. (Could be you went through 50 key cycles with no engine issues) When you get off the interstate & the idle is high,,, if you were to power it off and restart the bike, does the idle calm down or does it resume the high idle.
What causes a motorcycle to stall at idle?
Extremely lean motors can also stall out completely when given some light throttle. Another sign of lean running is the “hunting idle” where the motorcycle revs up randomly, changes RPMs, or takes forever to come down to idle.
Why is my throttle cable going bad on my bike?
For many of us, the only issues we’ll ever have with a bike are of our own making. Up until very recently, most bikes have had at least two cables that can go bad and cause headaches: the throttle, and clutch cables. The throttle cable normally lets you know it’s going bad by refusing to snap back the throttle grip when it is turned and released.
Can a bad throttle position sensor cause rough idling?
Faulty throttle position sensors can cause rough idling due to fluctuating airflow. If you see your car misfiring, idling rough, or stalling out while you drive, it is highly likely that you’re having a faulty throttle position sensor. Also due to fluctuating airflow, a bad throttle position sensor may cause all sorts of power issues.
What does suicide throttle mean on a bike?
Never ride such a bike – they call that a “suicide throttle” for a reason. It’s also a wise idea to get in the habit of checking now and again to see that your throttle isn’t affected when you turn the handlebars completely from side to side. The clutch cable is far sneakier and creeps into your perception as perceived clutch slippage.
Can a bad throttle position sensor cause idle surging?
Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. 3) Check Engine Light
Why are my Revs not dropping with the throttle closed?
It sounds like a vacuum leak. (a lean condition). One could surmise that this same lean condition could be caused by some crud partially blocking your fuel passages, but then you’d still need extra air. (Maybe the throttle blades have always been a little bit too open to compensate for some issues with the carb, and it is now coming to light?
What causes idle surges on a car ECM?
Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges.