IS350 Hiss Coming From The Engine

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08-16-11, 08:44 PM

sqa4life

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IS350 Hiss Coming From The Engine

2006 Lexus IS350
105k miles

I noticed a hiss coming from the engine when I step on the gas pedal (rev) @ lower speed (between 0-40mph) & at around 2500+ RPM. however, I don't hear the hiss when I go over 40mph. EVERYTHING STOCK!

Am I the only who has this issue?
What could goes wrong?

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08-16-11, 09:17 PM

coverchian

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Is the pump making noise? Check it out.

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08-16-11, 09:26 PM

iRock

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is the car running fine?

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08-16-11, 10:15 PM

sqa4life

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Quote:

Originally Posted by coverchian

Is the pump making noise? Check it out.

Water pump?

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08-16-11, 10:16 PM

sqa4life

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Quote:

Originally Posted by iRock

is the car running fine?

yes, it runs fine. Just the hissing noise that bother me.

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08-16-11, 10:58 PM

SRakaSSS

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Sounds as if one of your vacuum hoses came off. Open the hood and inspect ALL your hoses, including the connections.

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08-17-11, 06:42 AM

06isDriver

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It could be an exhaust leak, too

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08-17-11, 10:05 AM

Gville350

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If the noise is truly coming from the engine bay, pin point it by having someone in the cabin giving it some revs while you listen/search for the problem area. I'm leaning towards a vacuum leak, serp belt, or a intake/exhaust leak.