Skip the auto shop - Our mechanics make house calls

Q: engine sounds like its running faster than it is, like idle sounds fast but not

asked by on

what makes engine sounds like running fast but isn't. runs smooth at idle only does it driving, starts easy doesn't die

My car has 157000 miles.
My car has an automatic transmission.

Hi there:

High idle speed is commonly caused by a vacuum leak, problems with the EGR system or the idle control valve on our 2000 Chevrolet Silverado. The best way to determine which one specifically or other item is causing this issue you’re experiencing is to have a professional mobile mechanic complete an engine idle speed is high inspection.

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!
  1. Home
  2. Questions
  3. engine sounds like its running faster than it is, like idle sounds fast but not

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: Transmission - 2003 Chevrolet Trailblazer

This may be caused by a variety of things in addition to the TPS. These possibilities could include a bad catalytic converter, internal damage on the transmission, or many other engine sensor problems. For starters, I would recommend checking the...

Q: blower motor

The blower motor on this vehicle may have a blower wire connector that is overheated due to a blower motor drawing excessive amperage. Have the blower connector checked for overheating and replace connector and blower motor to fix the erratic...

Q: Engine won't idle when cold - 2001 Chevrolet Silverado

Hi there - given your repairs already, I would suspect a fuel-related issue, specifically the engine coolant temperature sensor (for engine management, not the gauge). If a faulty temperature signal is sent to engine management, the engine may not be...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.