Why does my Ford Focus idle high?

Malfunctioning Throttle: A malfunctioning throttle system can cause both a high or low idle as well as an engine stall. A dirty air intake or cracked air intake tube is often the culprit. Computer Malfunction: If the powertrain control module is malfunctioning, idle speed may be affected. via

How do you adjust the idle on a 2007 Ford Focus?

To adjust idle speed on ford focus set idle speed adjusting screw, clockwise to increase rpm, counter-clockwise to decrease rpm. via

What causes a motor to idle high?

If your powertrain control computer is misreading idle speeds, this can cause a high idling malfunction. When your car's throttle is malfunctioning, this can cause your car to stall or idle high. Often this is a result of dirt buildup in the air intake. Other times it can be a problem with a cracked intake tube. via

What sensor can cause high idle?

A torn or disconnected air cleaner tube between the mass air flow (MAF) sensor and the throttle body can also cause the idle to increase. This is unmetered air that the MAF sensor is not reporting to the car's computer, but the oxygen (O2) sensor will detect. via

How do I reset my idle speed?

You can reset the idle air control (IAC) valve by turning the car on, putting the car into park, pressing the brake down, then pushing the gas pedal down, counting down about 5 seconds, turning the car off, waiting 10 seconds and start the car again, checking to see if the car is idling properly. via

Why does my 2002 Ford Focus idle rough?

The most common reasons a Ford Focus has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. via

Why is my car idling over 1000 RPM?

The idle problem may be a result of a dirty or faulty idle air control valve. 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. via

Can a O2 sensor cause high idle?

Yes, a bad O2 sensor can cause a high, or rough, idle. The oxygen sensor output is part of the systems that control engine timing, combustion intervals, and the air to fuel ratio. When it starts to go bad, it can cause rough idling, loss of power, hesitation, or stalling. via

Can MAF cause high idle?

This may also be caused potentially by an intake air leak or a vacuum leak as this will create a lean fuel condition also causing a higher idle speed.
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Can spark plugs cause high idle?

1. Rough Idling. If you notice that your engine seems excessively loud while you are sitting at a stoplight or stop sign, your spark plugs may be to blame. Improperly functioning spark plugs cause an uneven burn of fuel in the engine, resulting in fluctuating RPMs and a louder noise. via

What is the correct idle speed?

The idle speed should feel consistent without skipping or slipping. In most of today's cars, an idle speed of 600 to 1000 RPMs is average. If your car is idling rough, though, it won't feel smooth. The RPMs will jump up and down, for example, or they'll fall below 600 RPM (or whatever is typical for your vehicle). via

What does the check engine light mean on a Ford Focus?

If the check engine light in your Ford Focus starts shining, that means that the problem needs fast attention and your Ford should be brought in now. This blinking light usually indicates a severe engine misfire allowing unburned fuel to be dumped into the exhaust system. via

How do you fix an idle problem? (video)

https://www.youtube.com/watch?v=KhvqT3blzVs

Why RPM suddenly goes up?

When the transmission develops a leak and fluid levels fall, a vehicle will begin to rev at higher levels as a result of the gearbox band or torque converter slipping. The vehicle may also experience irregular or delayed gear shifting. A manual vehicle experiencing this difficulty may be related to a slipping clutch. via

Why is my car revving high but not accelerating?

Worn Transmission Fluid (Automatic Transmission)

This can cause the engine to run roughly, stall or fail to accelerate when you press down on the gas pedal. You may need to have a transmission fluid change before more damage is done. via

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