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

asked by on October 27, 2016

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

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

Stalls while accelerating fast

Hello. It is possible that your passing maneuver fooled the Traction Control system enough to de-rate the turbocharger until you restarted the engine. Try turning the traction control off - it will severely limit power if triggered. Later model Sprinters...

Bad O2 sensor

Hello, code P0420 represents right main catalyst deterioration. There can be a few things that need to be checked before replacing parts. The intake system needs to be inspected for vacuum leaks and unmetered air leaks. The exhaust system should...

Brand new wiper motor keeps blowing the fuse.

If the wiper switch is in the "off" position and yet the fuse protecting the wiper circuit blows when you turn the ignition system on, there may be something wrong with the wiper switch itself in combination with a short...

Related articles

The Best Used Cars to Buy If You're an Archeologist
If If you are an archaeologist, you need a vehicle that will take you off the beaten path. After all, that’s where you spend a good deal of your time. And that means that you will need, ideally, an SUV...
How Can I Prevent My Car Battery From Dying?
Your Your car battery is one of the most important parts of your car’s electrical system. Without the battery, your car simply isn’t going to work. Your battery works hard, and eventually, it’s going to wear out. So, how long...
The Best Used Cars to Buy If You’re a Realtor or Real Estate Agent
If If you make your living as a realtor or real estate agent, you may have a number of considerations when it comes to purchasing a used vehicle. The most common considerations are budget, ability to transport people, and comfort....