Q: engine idle increases after shifting into park

asked by on April 01, 2016

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.

Engine idle speed is high Inspection $79.99 - $89.99 Get a Quote

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

Squeak

Hello. I would first try to determine if the sound you are hearing is engine or suspension related. If the sound seems to come and go according to your engine speed, then the sound is likely engine-related. I would put...

Hi Ben I noticed That when i took the inertia switch out my truck I heard something one is rattling is that normal

The inertia switch has a metal ball inside the switch that will make contact between the two terminals of the switch when working properly. The inertia switch is designed to move the ball away from the contacts in a roll...

Safe Mode is active on my truck.

Hi there. Your vehicle should have an AODE or 4R70W transmission. In this transmission, in the event there is a power loss to the transmission or if the computer shuts off the power to the transmission, the default gear is...

Extremely Rusty bottom

Although the bottom of the truck being rusty may not immediately be a cause for concern, over time, as you may know rust operates a lot like a cancer and will tend to spread rapidly eventually causing parts to break...

1995f-150 5.0 automatic isn't shifting to drive are overdrive anymore.

If you have not checked the transmission fluid , that is the first thing to do. You might be low on fluid and will be able to get function back by adding some. But if the fluid is not low,...

Starts then dies

When the engine is in crank mode the fuel pump relay is energized by ignition start signal. Once the car starts the fuel pressure relay is energized by the oil pressure switch. If you have fuel pressure during crank but...

How much would it cost to repair a wiring harness of a 1992 Honda Accord LX after it's been sitting for 6 years

Hello. The cost of the repair depends on what is wrong with it. The wiring can have issues from the rear lights up to the front. A full electrical diagnostic would need to be done by a certified mechanic that...

overfilled transmission fluid

You will need to have the excess fluid sucked out of the transmission so it is not overfull through the fill tube. Most mechanics have a suction tool that can pull out the excess fluid for you. The transmission may...

Engine noise

There is a few tests that should be done for the engine noise and the first is to find out what cylinder is not working and doing a compression test to see if the noise is a stuck open valve...

Related articles

2012 Ford Escape vs. 2012 Honda CR-V: Which One Should I Buy?
SUVs represent one out of every three vehicles sold in 2012, making them one of the most-purchased types of vehicles in the country during that time period. Compact SUVs are a sub-class that are slightly smaller and offer the most...
A Buyer’s Guide to the 2012 Ford Fusion Hybrid
The The 2012 Ford Fusion Hybrid is a really great choice for anyone looking for a mid-size sedan. Not only does it boast plenty of room for people and cargo, but it also has a good amount of power and...
The Top 5 Selling Cars in Florida in 2012
Florida Florida offers great weather year round, and the fact that snow and ice never factor into the equation means drivers don’t have to focus on the overall vehicle handling as they do in other states. The best selling cars...