Q: engine idle increases after shifting into park

asked by on

i have a 1992 ford explorer with 243000 miles on it. just recently, i have changed the oil and the spark plugs. i only take it for short drives of less than 10 miles. even on longer drives, i notice that after i come to a stop and shift into park, the idle climbs from around 700 rpm to between 1000 to 1500 rpm. could there be vacuum leaks that are causing the idle to spike like that? could a fuel filter change be needed since i do not know the last time it was done?

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

You should first check for any vacuum leaks that would cause the engine to idle higher than normal. Even your idle in gear sound a little high. If no vacuum leaks are found in the intake or the brake booster, then you will need to check the PCV valve for sludge buildup keeping the valve in the open position.

If this is okay, then check the throttle plates and idle control valve for carbon build up that could be sticking them open causing the high idle. If you do not find the problem then contact a mechanic like one from YourMechanic to come and diagnose why your engine idle is high.

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. engine idle increases after shifting into park

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: Rattle when cold engine - 2006 Ford Mustang

Hello. This could be a variety of many things and may be difficult to pinpoint without physically inspecting the car. Many cars tend to have small or subtle vibrations and rattles as fasteners, nuts, and bolts become loose over time....

Q: Q: car wont start

Hello, thank you for writing in. The cold weather can cause a wide variety of problems for your vehicle. You can start by testing for spark and fuel pressure to make sure the engine is receiving what it needs in...

Q: Car hums when running hot

Hi there. Vehicles can make all sorts of noises and whines, for many reasons. Because vehicles can run hot, and make noises for a variety of reasons, many times it is best to have a professional technician, such as one...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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.