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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
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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.


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