Why do my revs go up and down when idle?
If an engine is not getting enough fuel (this is called “running lean”), due to fuel pressure (regulated by the fuel pump and regulator), restricted fuel injectors, a vacuum leak or really anything that throws off the fuel mixture going in to the engine, this can cause the surge.
What causes idling not to be stable?
If spark plugs are improperly installed or malfunctioning, the idle speed can be affected. If this happens the engine will not get enough fuel, which can cause a rough idle, sputtering, stalling and even slow acceleration. Clogged Fuel Filter: A clogged fuel filter can cause similar problems.
Can a bad thermostat cause idle problems?
Is it possible that a faulty thermostat could cause a car to idle abnormally? – Quora. Yes, if the thermostat is stuck open, the engine may not reach normal operating temperature, and it might idle faster than it should, but it should still idle smoothly, unless there is an additional problem.
What does it mean when your ATV won’t idle?
When the engine idles fine but won’t rev up, it is a sign of it getting too little fuel, but it can also be because it is getting too much fuel. The ATV may run fine at low speeds, but as soon as you apply a little or a lot of throttle, the engine will bog down and turn off.
What to do if your car won’t idle?
The Fix: Set idle speed to specs. There may be some type of ignition problem. The Fix: Check and replace distributor cap, rotor, ignition wires, and spark plugs. There may be a fault in the computerized engine control system. The Fix: Bring your car to your mechanic or dealership to check the engine control system with a scan tool.
What causes a car to have a high idle?
If it stays shut then your engine is not going receive air and it won’t start. When the throttle gets stuck in an open position than your vehicle will receive too much air and cause it to have a high or fluctuating idle. What are signs of a bad Throttle Position Sensor?
Why does my bike lose power when I idle?
Again, if you ride a modern bike you’ll have no idea what a choke is, but even Electronically Fuel Injected motorcycles reveal a lot by “blipping” the throttle. Rich bikes are getting too much gas, so they idle high but lose power when given initial throttle because they can’t burn all the gas.