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Discussion Starter · #1 ·
Hey all,
I have a 1990 4WD with the 3VZ engine. When I rev the engine up and then release the throttle, a low rumbling sound comes from the air filter compartment. It almost sounds like a growling. It happens all the time and the air filter is clean. Is this normal? Any ideas as to WTF this sound is?
Thanks in advance.
 

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rookie
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796 Posts
I think I know what you are talking about. It sounds like Jake Brakes. and will make its sound at idle for a few seconds and then its off. I always thought it was the Vane Air Meter flap sticking open just a tad. What do i know.
 

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Discussion Starter · #5 · (Edited)
I think that everything is connected. If it is the EGR system is this normal? The check engine light came on for about 10 minutes the other day as well. I dont know if the 2 are related, maybe a dirty O2 sensor or something? Thanks for the replies.

Oh and yes pee_cup, the sound is very similar to Jake Brakes.
 

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Banned
'95 Toyota 4x4 xcab
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1,110 Posts
That noise comes from the flap inside the afm and is normal as far as I know. Mine has always done it, but it may be getting louder with age...

I wouldn't worry about it.
 

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YOTA Master
'93 2wd P/U
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2,439 Posts
The noise is normal..............

But it has nothing to do with the EGR or AFM. The noise comes from the pulse air injection system. Under decel conditions a valve opens that let air pulses to "drawn" into the exhaust stream to lower HC emmisions during decel.
 

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The stock airbox has a tube in the bottom to cut down noise as with almost every car on the road today. When you take them out it makes it easier for that noise to hear and thats why we do when the intakes are freed up. As for the source of the noise i couldnt tell you, only that its normal and there is no problem
 
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