Q: Car idling high

asked by on

My car is idling too high. The transmission won't go into a lower gear.

The problem you are experiencing may be the vacuum modulator leaking in the transmission. The vacuum leak will cause the engine to idle high and the transmission will not shift correctly. The vehicle should be tested for any problems with the transmission and engine which can effect one or the other. I recommend having a mechanic scan and test the engine and transmission for codes, and the modulator valve. This will need to be done in order to diagnose and repair of your high idle problem.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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!
  1. Home
  2. Questions
  3. Car idling high

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: Truck dying out.

Hey there. This is a common sign of a failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...

Q: Truck just quit while driving

With key in run position, the fuel pump should run momentarily to build pressure and then shut off. If the pump does run momentarily, preliminarily you can assume the fuel pump is supplying fuel. If the pump does not run...

Q: Just need to know what maintenance I need - Mercedes Benz ML320

Hello. My listings for the maintenance on this vehicle are as follows: 60k miles: Replace air cleaner, fuel filter, spark plugs 90k miles: Replace air cleaner Also keep in mind that the manufacturer service manuals can be found for free...

Related articles

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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.