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

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.

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.

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

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: Fuel vapor leak

A mechanic would need to do a through inspection to see why the injectors were damaged, and check all vent hoses for leaks. Sometimes, a smoke machine can be used to find what is leaking. I recommend having a mechanic,...

Q: When driving my car jerks

What you are describing sounds like a dirty or faulty mass air flow sensor. The mass air flow sensor monitors air intake as it is mixed with fuel prior to being injected into the motor. This sensor relays vital information...

Q: timing chain marks

You should leave the gear where it is unless you plan on removing the distributor and indexing it again. The engine as of now is not on the TDC (Top Dead Center) of the compression stroke of the number one...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.