Q: Car's rpm goes up and down while idling.

asked by on April 27, 2016

When I turn on my vehicle or have it parked, idling, the rpm gauge goes up and down, as if I'm pushing or revving the gas pedal. The car has died once since this started to occur, but I was able to start it again and make it home because it was a short distance. I checked all fluid levels and they seemed to be okay. The only one I was concerned about was the transmission fluid, it was on warm, but the color of the fluid wasn't red. It appeared to be patchy on the dipstick. Kind of brownish looking. What do I do?

My car has 157000 miles.
My car has an automatic transmission.

Engine idle speed is high Inspection $79.99 - $89.99 Get a Quote

The power train control module controls the idle on the vehicle using different sensors and actuators. If you do not have any codes in the computer for the problem then you may have to have the computer reprogrammed per the manufacturer technical bulletin 18-13-00 dated August 2000. I suggest having the idle issue inspected by a qualified mechanic like one from YourMechanic first, to make sure there are no other possible causes for the idle problems and then have the computer reprogrammed with the dealer reprogramming scanner.

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

What others are asking

Will this service remove my check engine light and allow me to pass emissions?

The answer is "not necessarily" because the Codes you are reciting, P2004 and P2017 do NOT necessarily mean that there is anything wrong with the intake manifold runner control valve itself. The only way to determine if that valve is...

Clutch won't engage. Replaced master cylinder ... Still not working

Hello. I usually start by checking the movement of the clutch slave cylinder when the pedal is pushed in. If the slave cylinder is not moving, then the hydraulic system is at fault, which can be due to air...

How do I use the Uconnect voice training system?

If your Uconnect is having a hard time recognizing what are saying, then you can use the voice training feature. This will help your Uconnect system recognize your voice. You can turn on the voice training system in four different...

Passenger side battery boiling over

This may suggest you have a voltage regulator that is allowing the alternator to overcharge the battery causing it to boil as you describe. The voltage regulator is a unit that regulates the charging of the battery by the alternator....

clunk in front end

Hello. The symptoms you describe can be caused by a wide variety of issues. If you have already replaced the ball joints and tie rod ends then I would move on to looking at the vehicle's control arms. If the...

White smoke coming from tail pipe.

While vehicle smoke can appear in a wide range of colors, white smoke from the exhaust is often an indication that the car is burning coolant in the engine. Coolant is normally found in the cooling system and can enter...

I have a 2008 dodge avenger. 2.7. V6. Morning. Run great once warmed up. It starts to misfire n runs very rough. Already changed

Hi Christopher. Typically when an engine misfiring issue occurs after the engine has come to operating temperature, it's due to fuel related components, such as fuel injectors that are clogged or misfiring themselves. This could be due to excessive carbon...

My vehicle 2000 grand caravan. Wont shift into 2nd gear i have low when put in 3rd to try coming up through the gears it wont shif

Hello, thank you for writing in. When having issues shifting, the first thing you want to do is check the level of your transmission fluid. The hydraulic fluid is what allows the gears to be changed, and it is a...

My car is leaking antifreeze /coolant and my car overheats and my heat doesn’t work blowing out cold air

Based on your description it sounds like the overheating is accompanied by a coolant leak. Coolant leaks can be either a cause OR a consequence of overheating. Be sure not to drive the car if it is overheating because overheating...

Related articles

2012 Jeep Grand Cherokee vs. 2012 Dodge Durango: Which One Should I Buy?
Medium to large SUVs are a fun class of vehicles: plenty large enough for moving people around, but if you really want to get out there in the mud and have some fun, they are still good for that type...
2012 Ford Mustang vs. 2012 Dodge Charger: Which One Should I Buy?
Technically these two vehicles have wildly different classifications: compact for the Ford Mustang and large car for the Dodge Charger. However, who would consider either one anything other than a muscle car? These cars are meant for speed, fun, and...
2012 Toyota Highlander vs. 2012 Dodge Durango: Which One Should I Buy?
Sport Utility Vehicles (SUVs) are a fun class of vehicle: not only are they great for carpools and moving around friends and family, but you can also get them off-road and just get dirty and have fun with them. These...