Skip the auto shop - Our mechanics make house calls

Q: Car idling high in park

asked by on

At first my car idled high, at around 1,500 RPMs, while in Park or Neutral. Now, the car starts, but then stalls immediately. Could it be the throttle body, EGR valve, or even a vacuum leak?

A: At such a high idle speed, a large vacuum l...

At such a high idle speed, a large vacuum leak would be possible if the engine didn't return to a normal level after warming up. The idle air control valve regulates engine speed when the throttle plate is closed, allowing air to maintain idle speed. A blockage, or malfunction here can cause your concern. Have a technician, such as one from YourMechanic, run a diagnostic on your engine's high idle speed.

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・Save up to 30%

Get a quote

What others are asking

Q: Throttle problems at start

Your vehicle does not have mechanical throttle linkage. Instead, it is equipped with a "drive by wire" system, which uses a stepper motor to control throttle position. My guess is that the problem is somewhere in this system. Throttle initialization...

Q: Problem with not dying

Hello there, thank you for asking about your 1994 GMC Jimmy. The engine would need to be checked for a stuck open EGR valve or a major vacuum leak. The most common cause is the EGR stuck open with carbon...

Q: NVIS (Immobilizer System) in my Pathfinder Armada is rejecting my key; I know its correct key.

Operating a modern computer controlled vehicle with a dead battery can damage the Powertrain Control Module due to the voltage instability, particularty voltage excursions on the high side (above 14 volts), that occur when the alternator has no buffer to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.