Q: My engine idle is high when I start my car

asked by on

I don't know if this something new, but I've noticed that my idle is around 1500-2000 RPM upon startup. I heard that normal RPM is around 800-1000 RPM. Is this going to turn into any problem down the road? Thank you!

My car has 100000 miles.
My car has an automatic transmission.

If the idle shoots up just after startup then drops down, this is not usually a major cause for concern, and often normal. Although 2000 rpm does seem a little high, 1500 rpm isn’t really to out of the ordinary, as long as it drops back down to normal. If this is indeed what it does. Of course, all vehicles will idle high when cold. It is necessary for cold start up. Depending on the outside temperature, it should drop down to normal in a few minutes. Longer if it is near freezing outside.

The throttle bodies on your particular Accord are susceptible to carbon build up. It can make the throttle plate stick. There are also reports that the throttle plate can warp causing high idle issues. Usually these problems make the idle stay high under all conditions.

Other conditions that can cause high idle are vacuum leaks that allow more air into the motor. These can be intermittent problems, but not usually. Some areas to look are around the points that the intake manifold bolts to the head, EGR valve and EGR valve ports, broken vacuum hoses, and a failed brake vacuum booster.

Other than a high idle that doesn’t drop to normal, the only problems that should be addressed sooner than later are vacuum leaks. Vacuum leaks can lead to other internal motor damages that will be much more expensive to fix. If the problem persists, you may want to have your high engine idle speed inspected by a professional technician to determine if any repairs are needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My engine idle is high when I start my car

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: Q: How often should I change my transmission fluid?

Honda recommends the transmission fluid be changed every 37,500 miles under "severe" conditions and every 120,000 under "normal" conditions. In my 30+ years of working on vehicles and maintaining my own vehicles, I recommend a more in the middle schedule....

Q: Q: car cranks but wont start

The most common cause of the engine crank no start is loss of ignition spark from the ignition system. The distributor is known to have internal shaft oil leaks that will short out the internal cam and crankshaft sensors and...

Q: My car turned off while driving and check engine light went on,oil,and battery light and after I turn on and it was all fine

After disconnecting the battery in order to service a problem you may encounter stalling or other issues while the computer relearns idle. If you continue to have running issues after a couple days of driving then you will need to...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...