Skip the auto shop - Our mechanics make house calls

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?

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: Problem of my Ford ranger tdci 3.0L

Check for spark while the engine is hot and not wanting to start. If the coil pack has any cracks, they can spread when the engine is warm and cause a short to ground. Consider hiring an experienced technician to...

Q: Why is car stalling?

Hello. If you get a strong smell of fuel when this occurs you either have an internal fuel leak or a coolant temperature sensor problem. I typically start by checking the fuel injectors and pressure regulator to see if they...

Q: Stalling,bad fuel mileage,won't start without Acceleration, rough idling.

This may be related to a couple of different things. I would recommend checking the idle air control valve/module which works similar to the MAF sensor in that it regulates air intake as it is mixed with fuel prior 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...