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: 2005 Mazda6 hard to start

Hi there. Since the Check Engine Light is on then I would typically need to scan the computer for codes to see what the computer is seeing as a fault. This is the best way to start the diagnostic on...

Q: Engine sounding loud.

It sounds like your talking about engine oil that has mixed with your coolant, depending on where you find them mixed whether in the engine or radiator would be the first diagnostic information. Coolant in the engine usually means problems...

Q: Can't clear P o341 code

A P0341 for your Pontiac is a camshaft position sensor problem code. This can also indicate a problem with the ignition module. These systems can sometimes "cross-indicate" since they are both timing sensitive. In the absence of driving symptoms from...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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.