Need Help?

2011 Chevrolet Impala LS Retail 4dr Sedan

2011 Chevrolet Impala
Trim Info:
Front Wheel Drive, 4 Door Sedan, Large
19 mpg city / 29 mpg hwy
Other Trims
Do you own this car?
Estimated Mileage
Enter current mileage for most
accurate info about this vehicle

Track Your Service Records
Get Recall Alerts
Get Updated Value Estimates on Your Car.

back to question list

Ask the Community

Ask Our Auto Mechanics

April 24, 2013, 12:44 pm

Samuel M

Question: Hesitation when accelerating after come to a stop

My car hesitates sometimes when I come to a complete stop and I can hear a hissing sound coming from where my intake and throttle body is I already changed my intake gaskets and I still hear it

April 28, 2013, 9:42 am

Ron W
Expert Mechanic

Maybe the throttle plates are worn and air is leaking in though the bushings. Or you have a vacuum leak and what you hear is air being sucked into the intake.

The easiest way to find a leak in a vacuum circuit is with a smoke machine. With the engine OFF, pump smoke into the intake manifold through a vacuum port and wait. The smoke will come out wherever there is a leak. Most shops can do this for you to isolate the leak.

0/0 users found this helpful.

Ask our panel of certified auto mechanics a question. We pay for their advice so you don't have to

My Auto Score

See the free AutoCheck score

Meet The Experts
Kim Perrin
Kim Perrin is our resident mechanic here at DriverSide. Kim worked as…
Tyler Orr
Tyler Orr is an expert in German and Japanese cars and has been a mechanic …
Elizabeth Kriesten
Elizabeth Kriesten worked as an automotive technician for several years at Dodge…
Tips on Servicing

Car Brakes: How Do You Know When to Change Them?

By Zach Bowman For those who suffer a daily commute through heavy traffic, your vehicle's braking system can bring thousands of pounds of metal, plastic and empty Starbucks cups to a stop hundreds of times before you get to work. It goes without saying that these pieces wear out, but they do so slowly, meaning you may not notice they need attention until ...

Read more…