Why does my RPM go down when I brake?
This may be a sign of a failing idle air control valve. In cases where this valve is clogged or is failing, your vehicle will stall instead of slowing to an idle after the release of the throttle. I recommend having a professional replace your idle air control valve.
Why does my car RPM go up and down when stopped?
Hi There, It sounds like you may have a dirty or failing idle air control valve causing your engine idle to fluctuate. When the idle air control valve is not working properly, this cause a disruption in this process resulting in the engine not being able to idle properly.
Why does my RPM drop to zero?
If the RPMs drop off right as the engine is stalling then the most common cause of this is a bad crankshaft position sensor. This sensor tells the engine computer what the engine RPM speed is and what the position of the cylinders are. If it fails, the computer does not know the position of the engine so it will stall.
Can a Toyota 4Runner use a brake booster?
A brake booster for a toyota pickup can be hard to find but you can also use one from a comparable 4runner. The only issue I encountered is the new booster made the brakes overly powerful and touchy. BYE you think thats my problem too?
Why does engine rev up and down when I step on the brake?
When I step on the brake it revs up and down as if it is going to stop, but it doesn’t. I let off the brake it revs/runs fine…
What should I do if my Toyota 4Runner Idles?
If the motor idles better replace the brake booster. A brake booster for a toyota pickup can be hard to find but you can also use one from a comparable 4runner. The only issue I encountered is the new booster made the brakes overly powerful and touchy.
What causes the RPM to go up in idle when pushing the brakes?
No, the RPMs should not go up when pressing the brake pedal. We were just explaining why a leak in the Booster results in higher RPMs. Or as Glenn says depending on where the FIP and air knob is set. Disconnect your brake booster and plug the vacuum hose.