Skip the auto shop - Our mechanics make house calls

Q: Just put on new throttle body now when start car idles fine but as warms up idle starts surging and bouncing up and down

asked by on

Put new throttle body on and idle starts high and as car warms up idle surging and bouncing up and down did relearn procedure but no help idle seems to get stuck and rises for a few seconds when pushing gas pedal

My car has 113000 miles.
My car has an automatic transmission.

First you need to check all the air hoses and vacuum lines. Any air that enters the engine without passing through the throttle body will make it behave badly. Then I suggest you disconnect the battery for a few minutes and review the re-learn procedure for the car. It’s pretty intricate, and not following it exactly can lead to a failure. Failing that, I suggest you get professional help. You don’t want to just start replacing parts as that can get expensive very quickly.Your Mechanic can send a qualified technician to your home to check out your car and help you figure out what needs to be done next.

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
  • Home
  • Questions
  • Just put on new throttle body now when start car idles fine but as warms up idle starts surging and bouncing 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: The Malfunction Indicator light.

Hi there. Thanks for writing in tonight. When a warning or service light is illuminated on the dashboard it is typically caused by an error code that has been triggered by a sensor or vehicle monitoring system and stored in...

Q: Battery light coming on faintly after installing new alternator

Hi there. Have you had the battery tested? Use a digital battery tester that provides current voltage, cold cranking amps, and state of health. Any corrosion on the terminals? This could present an opportunity for electrical disturbances and create concerns....

Q: AC works fine during driving, blows warm when idling

The A/C system pressures would need to be checked to see if it is low on refrigerant. A low system will not cool as good at idle as it would on the highway. The fans need to be working correctly....

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...