Q: idle is high after driving

asked by on

i am stumped as to why my 92 ford explorer idles very high after driving it. upon startup, it will idle around 500-700 rpm. after i drive it for any fair amount of time (5 miles or more), i will shift into park and the idle goes up to around 1000-1200 rpm. just did an oil change recently, brand new spark plugs, checked pcv valve (still good). no vacuum leaks. what could be the issue?

My car has 243000 miles.
My car has an automatic transmission.

Hey there. Normally a vacuum leak is the most common cause of a high idle but many issues may cause this. Other possible causes of a high idle are improper sensor inputs, an idle air control valve, a faulty engine coolant temperature sensor, a stuck throttle body, a throttle body cable stuck, a bad power steering pressure sensor, AC high pressure sensor or a problem with the ECT (electric control transmission).

As you can see, many different systems cause a high idle condition. With the high idle not occurring until after the vehicle has been heated up, it appears there may be a heat related fault such a sensor reading improperly once it gets hot, or an intermittent issue with the IAC sticking sometimes. A complete inspection will be the easiest way to diagnose your high engine idle.

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. idle is high after driving

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: Timing chain

If the timing chain broke in the front or rear of engine then it could bind the crankshaft from turning. If engine will not turn with starter in the normal direction then you may be able to use a socket...

Q: how much does it cost to get a timing belt replaced for a 2007 ford explorer v6-4

Hi, I will be glad to help you with this. You can get the exact written quote that you desire, and schedule the repair to suit your needs, by simply visiting YourMechanic’s timing chain replacement service page. Once on that...

Q: my interiro lights, headlights, radio turned off while driving

Hello, thank you for writing in. The vehicle is likely having an issue with it's charging system. The alternator and the battery will need to be tested. These can be tested in the vehicle, or bench tested at most automotive...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.