Skip the auto shop - Our mechanics make house calls

Q: Idle issues

asked by on

As soon as I crank it will idle all way to Rev unless I cut switch off

The idle air control valve should not be able to idle the engine more than about 3000 rpm. If the engine goes higher than that, you have a major vacuum leak or the throttle is stuck open for some reason. Look at all the hoses that connect to the intake manifold and the brake booster to see if you see any broken or loose hoses. Remove the big inlet hose to the throttle body and look in at the throttle plates to see if they are stuck open more than about the thickness of a piece of paper. If they are open more than this, then you have a problem with the throttle body or cable. If you cannot see any issues, consider having a mechanic come and diagnose this idle problem for you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Misfire on my engine and I am getting an injector code 27. (OBD1)

Hi there. The injector output driver is not responding properly to the control signal. Check the wiring from the computer to the injector driver. If the noid light is flashing erratically, then the controller (computer) is not functioning correctly. You...

Q: brakes and they told her no pin on sway bar

Sway bars are responsible for keeping the vehicle level during cornering. If the vehicle did not have a sway bar, it would rock to whichever side is opposite of the direction you are turning. The sway bar provides stability for...

Q: Brakes not performing well.

Hello. After the new brakes were installed the stopping power of the braking system should be about fully restored. If you are noticing that you have to press down harder to stop the vehicle there could be several things causing...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.