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?

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・Fair and transparent pricing

Get a quote

What others are asking

Q: How many hours should it take to replace a left rear axle on a 2007 freightliner, century series?

Hi there. Your question depends on whether the axle and flange gasket was replaced with an oil top off or the axle, flange gasket, wheel bearings, brakes, wheel seal, and gear oil was replaced. If the axle and flange gasket...

Q: Ignition Problem

Hello, thank you for writing in. To better understand this strange issue, it helps to know that the engine receives most of its power from the alternator once the engine has started. When the field to the alternator is not...

Q: SES light crack noise

Hello. The symptoms you describe are actually a common known occurrence among 135i models. The 135i uses a turbocharged engine that generates high boost pressures, which can sometimes cause boost hoses to come free due to excessive pressure. I would...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...