Skip the auto shop - Our mechanics make house calls

Q: My RPM needle keeps moving up and down

asked by on

Rpm needle keeps moving up and down

My car has 260000 miles.
My car has an automatic transmission.

Hello. This may be related to a faulty idle air control valve. As you may know this is a unit that monitors the air intake into your car’s engine as it is mixed with fuel. When this is not functioning correctly, this will cause the car to idle very roughly as you describe or in some cases not at all. I would recommend having an expert from YourMechanic come to your home to diagnose the rough idle and replace the idle air control valve as necessary.

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

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: Car fuse problem

Vehicles are equipped with large main fuses that can cut power in the event of a large short to prevent hot wires from causing fires. I recommend having an experienced technician inspect the electrical system for a faulted item. They...

Q: nissa d21 z24 carburated strange rattling noise

Hello. In regards to your idle speed issue, I would recommend tuning and adjusting the carburetor until the correct idle speed is achieved. As far as the rattling noise goes, firstly I would check to make sure that the engine...

Q: Car ran out of gas and multiple repairs resulted

As you may already know, your car's fuel pump is cooled by the fuel in the tank. Fuel pumps do tend to generate a fair amount of heat and so naturally, when it does run dry, it can easily damage...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...