Skip the auto shop - Our mechanics make house calls

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

asked by on

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.

A: The power train control module controls the...

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.

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: When I'm driving the car pauses and when I hit the gas it comes back to life, is it the accelerator sensor?

Hi there. The APP (accelerator pedal position sensor) could cause the vehicle to pause or hesitate. A faulty TPS (throttle position sensor), a faulty MAF (mass airflow) sensor, incorrectly calculating the incoming air to the engine are also possibilities. Typically,...

Q: How do I know if my tie rod is bad

When the tie rod end starts to wear, it's commonly due to excessive abuse (like driving on bumpy roads or being hit by blunt objects like curbs and pot holes). Frequently, the part that wears out in the tie rod...

Q: Car jerking when accelerating from stop.

The valve covers on these engines are known for leaking oil into the spark plug holes. The seals are part of the valve cover and may need to be replaced. A qualified mechanic, such as one from YourMechanic, can check...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.