Why does my truck rev up when I brake?
The brake booster improves the master cylinder setup utilized to lower the pedal pressure required for braking. If the brake booster has a leakage, it allows additional air into the intake manifold. As a result, the air enters the engine and causes the revving.
Why does my car idle when I brake?
This may be a sign of a failing idle air control valve. This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage.
What does it mean when Toyota pickup surging idle?
They are activated by coolant temp to open and close for quicker warm up. When they stick then you get this surging up to 1400 RPM or so then a rapid drop in RPM’s and the cycle continues as long as you are on the brake pedal! In other words it’s the IAC that’s bad. 7 people found this helpful.
What happens when your idle is too high?
If your idle is too high (i’m guessing 1300 rpm+) and you step on the brakes the ECU thinks your coasting to a stop and kills your injectors to save on fuel… While in nuetral it’ll do the same thing surge, lower your idle and the surging will go away…
Why does the idle surge when in neutral?
This went away the next day or so, but every time I’ve made that 4 hour drive, it happens for longer and longer each time. Now its really bad, and on top of the idle surging while the brake pedal is pressed, it ALSO idles really really high when in neutral and even sometimes surges but in fewer intervals when in neutral.
What’s the idle speed of a Toyota Prius?
Fully warmed engine idles @ 800-900 rpm. When the AC kicks on it should jump up to 1000-1100 rpm… Yes, counterclockwise lowers the idle speed… It’s basically an air bypass valve. So tightening closes the valve and vice versa to increase idle speed….