Q: 1993 Lincoln towncar revs up by itself while idling but not while driving. what's the most common cause for this?

asked by on July 02, 2017

My car recently started to rev up by itself while idling in park. It does not do it while driving. What is the most common cause of this?

My car has 150000 miles.
My car has an automatic transmission.

Engine idle speed is high Inspection $79.99 - $99.99 Get a Quote

Hi there. In most cases, when the engine will idle higher after shifting into neutral or park is an indication of a vacuum leak. It could also be due to a malfunction of the idle control valve, or a malfunction of the throttle body itself. You might want to have a professional mechanic come to your location to complete an engine idle is high inspection, to determine the root source of this problem and recommend or complete the right repairs.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Popping when I turn on engine

Can a blown fuse drain the battery when the car is off?

Would a bad or faulty vvt solenoid cause the engine to knock and cause a misfire on the

Hello there. A bad or faulty connected VVT solenoid can and often does cause engine knocking, inconsistent idle and acceleration problems. The issue could be with the solenoid itself or the electrical harness connected to the VVT. The best way...

After changing the alternator, my car won't start - 2005 Ford Focus

Hello. The battery should be checked first. If the battery is low enough, then this will occur. If the battery is fine, then the fuses for the charging system need to be checked. If one of the wires for the...

Won't start - not getting fuel into the injectors

Hey there, thanks for writing in. Lack of fuel pressure here often points out a clogged fuel filter. I would have an experienced technician inspect the fuel system and check pressure at the fuel feed line under the hood. The...

Air conditioner blows hot air. 1995 Mercedes-Benz E300

Hi there, thanks for writing in about your 1995 Mercedes-Benz E550. This could be a variety of issues, such as no pressure or low refrigerant levels, a bad compressor clutch, or a compressor not engaging correctly. Check to see if the...

Throwing codes after replacing the font left wheel bearing

Your truck has a wheel speed sensor and exciter ring that are built into the wheel bearing and hub assembly. If the entire wheel bearing and hub assembly was replaced as a unit like it's suggested, then you could have...

Related articles

Lincoln Certified Pre-Owned (CPO) Car Program
Lincoln certified pre-owned cars are under 7 years old, have less than 60,000 miles, and come with a 6 year or 100,000 miles comprehensive warranty.
A Buyer’s Guide to the 2011 Lincoln Town Car
2011 2011 marked the final year for Lincoln’s aging Town Car. It offered an immense amount of space in the front and the rear, as well as the iconic style for which the line was known. Key Features Perhaps...
A Buyer's Guide to the 2012 Lincoln MKZ Hybrid
When When it comes to performance, there’s no argument: the 2012 Lincoln MKZ Hybrid is the leader in its class. Fortunately, it brings a number of other amazing features to the table too. Key Features Speaking of performance, let’s start...