What are the symptoms of a vacuum leak?
What Signs Will Indicate a Vacuum Leak?Your Idle is Running High or is Sporadic.
Your engine’s RPM goes up as more air cycles through your engine.
Stalling or Hesitating Engine.
Loud Hissing, Squealing or Sucking from the Engine..
Will a vacuum leak cause car to run rich?
You are correct in your theory about a vacuum leak. It should not be the cause of a rich condition. You are too rich because more fuel is being supplied than spec for the amount of air available at the throttle body and intake manifold.
Is a vacuum leak expensive to fix?
The parts necessary to fix the vacuum leak are really not that expensive and can be not much more than replacing the hoses or a gasket. It is the search that can cause repair to become expensive. The engine vacuum leak is not easy to find without knowing the symptoms.
Can you drive your car with a vacuum leak?
Driving with a vacuum leak should not be done because it causes a loss of power to your engine. This can be unsafe while driving down the road, especially if the leak increases as you are driving.