Q: Car has hissing sound when initially accelerating

asked by on

I have been searching a long time for a solution and hope that you can help me. There is a hissing sound whenever I accelerate. The hissing occurs only in the initial phase of the acceleration. I can not detect from where it is originating. The volume also changes and sometimes it is louder than other times. Another item of concern is that sometimes my car feels sluggish, but other times it feels light and powerful. Do you know what is causing this hissing and the sluggishness?

Hi there, thanks for writing in about your 2006 Porsche Cayman. Generally, a hissing noise will come from a leaking vacuum source or something like an exhaust manifold gasket. The vacuum leak will cause some performance issues as the engine computers have a hard time regulating fuel delivery. If you would like to have this checked, a certified expert from YourMechanic can inspect the noise and perform any needed repairs.

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. Car has hissing sound when initially accelerating

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: My Kia Forte is making a grinding knocking noise when I put it in drive and accelerate and at about 5 mph and up it goes away unti

Hello. Exhaust systems can make a variety of sounds that we would not intuitively expect. When I was first learning about exhaust systems I was surprised to find out how dynamic they can be. I am assuming you are speaking...

Q: Shifter cable broke in heavy traffic on highway

There are a lot of inquiries regarding a similar issue with vehicles of your year and model. The linkage connection is made of plastic and will eventually break. A metal safety clip or an extra tie may be used to...

Q: Replaced Master and Slave clutch cylinders, feels like I have a clutch but can't put into gear while running.

You may still have some air in the clutch hydraulics, or you are having an issue with the clutch not fully releasing. This can be from the air in the system causing the clutch slave cylinder to not move far...

Related articles

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.
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.