Skip the auto shop - Our mechanics make house calls

Q: RPM problems

asked by on

My throttle is always stuck at around 1500 and never drops I had the throttle body cleaned and it's never ran right after that. Do you have any suggestions?

My car has 60 miles.
My car has an automatic transmission.

A: Hi, thanks for writing in. This may be rela...

Hi, thanks for writing in. This may be related to couple of things such as a vacuum leak or potentially an improperly adjusted throttle plate screw. When a vacuum leak is present in an engine, it can cause an imbalance in the air/fuel mixture which can cause the engine to race or surge at a higher RPM than normal due to the excess air flow. The same effect is also similarly true when the throttle plate is incorrectly adjusted. This is a plate inside the throttle body that remains slightly open to let just the right amount of air in at idle to maintain the proper air/fuel mixture. When this is incorrectly adjusted allowing too much air in, this will also cause an imbalance in air/fuel mixture, again causing the motor to race or surge at a higher RPM. I would suggest having an expert from YourMechanic come to your home to diagnose and correct your high idle issue.

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・Save up to 30%

Get a quote

What others are asking

Q: Timing cover and coolant leak questions

Hello and thank you for contacting Your Mechanic. Having a coolant leak will not damage a timing cover, however, having an engine overheat will cause a timing cover to warp or crack if the coolant was to spray on it....

Q: The ABS and VSS lights are on!

Your car is equipped with wheel speed sensors at each of the four wheels which monitor wheel speed while relaying this information constantly to the ABS and traction control system which are controlled by the car's ECU. When the ECU...

Q: I hear a clicking noise when engine starts

From the information provided on your Nissan Frontier, has lead me to believe that it may be experiencing an undercharged battery or even possibly a bad starter. To be 100% certain however, it may be time to enlist the assistance...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...