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Discussion Starter · #1 ·
I have a hissing sound coming from the intake.
I have since removed the Injen and reinstalled the stock air box and the hiss is still there.
Does anyone know what could be causing this issue?
Should I take it to the dealer?
Anyhelp on this issue would be greatly appreciated.
Thank you
Domenick
 

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Nor*Cal's Most Hated
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That hissing sound is normal, its the air being sucked in by the intake.

I'd put the aftermarket intake back on!
 

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yea man that is all the air you are getting to the car at a fast rate its the same as the stock with a lil less resistance its just not as obvious as the stock due to the fact that the filter is open and the stock is in a box
 

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TheOtherGuys
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hissing is normal with an intake. Means it is working.
 

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Discussion Starter · #5 ·
It is much louder now than ever!
I believe it is also running lean.
It makes a gurgling sound when it hits 3200 rpm and it doesnt have as much juice as it did before.
I took it to my mechanic and he said the car ws getting too much air.
He is the one that told me to put the stock box back on.
On a high note im getting better gas mileage.
I'm at 3/4 of a tank with 100 miles on the trip meter.
 

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Clockwork Orange said:
It is much louder now than ever!
I believe it is also running lean.
It makes a gurgling sound when it hits 3200 rpm and it doesnt have as much juice as it did before.
I took it to my mechanic and he said the car ws getting too much air.
He is the one that told me to put the stock box back on.
On a high note im getting better gas mileage.
I'm at 3/4 of a tank with 100 miles on the trip meter.
It won't be running that lean. That's what the MAF is for. It recognizes the air flow and tells the car how much gas is needed for the injectors.

The gurgling, if anything is from not having enuff back pressure in the exhaust system. But then again I'm not expert, and have been contradicted by the so called experts many times.

Unless of course something was not installed properly.
 

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Discussion Starter · #11 ·
squirrel said:
It won't be running that lean. That's what the MAF is for. It recognizes the air flow and tells the car how much gas is needed for the injectors.

The gurgling, if anything is from not having enuff back pressure in the exhaust system. But then again I'm not expert, and have been contradicted by the so called experts many times.

Unless of course something was not installed properly.
I just had a front swaybar installed like an hour before the hiss sound started.
The car was on jack stands and the engine cradle was dropped a little.
But I dont believe that any install of a sway bar could directly cause this problem.
Even though I put the stock box back on the hiss is still quite apparent.
I thought if I disconnected the battery and let system relearn my driving habits, this would fix the hiss by using less air.

I have had intake headers and exhaust on this car for over a year. I never heard gurgling before.


My main concern is, is this problem of too much air going to harm my engine?
 

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Don't disconnect the battery, check my ECU rest thread!

Maybe the mechanic didn't bolt something back properly. Is it intake hissing or exhaust hissing?
 

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TheOtherGuys
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Did he put the filter back in the air box???
 

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Or worse yet, did the mechanic bolt down the airbox right, or install it correctly?
 

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Discussion Starter · #16 ·
I put the air box in, so im sure it has the filter.
The hissing is comming from right under the throttle body or the intake manifold.
 

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Are you in CA? If anywhere near Nor*Cal or San Joaquin county, I could check it out for you.
 

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Clockwork Orange said:
Damn im in SoCal.
But thank you
I'll be at the Scion Kickoff in Torrance on saturday.
 
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