Q: Shaking and revving upon startup.

asked by on

The car shakes and the engine revs upon startup.

It is normal for the engine to rev a bit higher than normal when a car first starts up. But, after a few seconds it should come back down to normal. In cold weather, it might stay high for a few minuets. But, if the RPMs are going very high then there is a problem. The idle should go up a few hundred RPMs not a few thousand. A large vacuum leak can cause symptoms similar to what you are describing. A faulty or stick Idle Air Control Valve could also cause this. If you think the RPMs are going up abnormally I would suggest getting a technician to have it inspected for you.

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. Shaking and revving upon startup.

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: Code p0128

Your vehicle does not have a coolant sensor and uses the cylinder head temperature sensor to do both jobs. The system uses this sensor to sense both the coolant and head temperature. If your vehicle fan is running all the...

Q: Flashing check engine light - 2005 Ford Ranger

Hey there. You should probably have another look at your plugs and wires to see if the work was done correctly. Something may not be well connected causing an intermittent misfire. The Check Engine Light comes on steady when the...

Q: Car idles high

The main cause of this model car running rough is the ignition coil. Normally, a misfire code will be generated and can be found by connecting a scanner tool to the cars OBD2 port and performing a scan. I would...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.