Skip the auto shop - Our mechanics make house calls

Q: Car idling high and rough

asked by on

After I replaced the spark plugs and cleaned the throttle body, my car started idling high and rough.

The cleaning of your throttle body may have caused a vacuum leak in the intake system. It’s also possible that an improper hose reinstallation to the throttle body is causing unmetered air between the throttle body and the mass air sensor. I would recommend having a mechanic, such as one from YourMechanic, run a diagnosis on why the car idle is rough, and recommend the best path to repair.

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: car jerks/gas pedal

Hi, thanks for writing in. This is more than likely a fuel delivery issue, given the symptoms you describe. The idle air control valve is a unit that regulates the air flow into the engine as it is mixed with...

Q: Minivan shutting down; cleaned IAC

Hello. It is possible that cleaning the Idle Air Control (IAC) valve would fix this problem permanently. However, because it is not likely that all of the dirt was cleaned out the IAC valve it may fail again. It would...

Q: What's the cost for front and rear break pads on 04 mazda6?

Hi there. To request a quote to have your brake pads replaced, [simply click this link to the brake pad replacement page]https://www.yourmechanic.com/services/brake-pads-replacement)(. Once on that page, click the blue Get a Quote button and enter your information in the box....

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...
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...
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...