Q: What should I do when my engine revs up and down?

asked by on

After clean the troytle, my car engine revs up and down.

My car has 13456 miles.
My car has a manual transmission.

You first want to want to make sure that all electrical connectors at the throttle body are dry, free of corrosion and dirt, plugged in and making secure contact, particularly if you removed any during the service. Make sure none of the terminals are damaged or missing. If the connections are all made and the uneven idling problem arose after the cleaning, but did not exist at all previously, obviously something has been damaged.

Among the possibilities in the area you were working in are the TPS (throttle position sensor), a vacuum leak, the MAF (mass airflow sensor) sensor and the IAC(idle air control valve). To avoid any unnecessary repairs, a mobile technician, like one from YourMechanic, can perform a diagnostic on your rough idle at your own location.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What should I do when my engine revs up and down?

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: Hyndai elantra P2196 P2096

Hi there. Typically these codes are caused by an exhaust leak, clogged injectors, or intake vacuum leak. If problems just happened to start after getting fuel, then you may have a purge valve leaking excessive fumes into the intake when...

Q: Transmission stopped forward backward

Hello. There could be an electrical problem with the transmission. Some of the wiring to the transmission could have been damaged from road debris or the computer for the transmission has failed. There may also be some internal parts of...

Q: Ticking when accelerating

With the information that you've provided, I think you are describing an exhaust leak. It's not uncommon for a minor exhaust leak to tick, especially when cool, and then go away as it warms up. It can also increase when...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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 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...