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Posted

morning guys, on some mornings, cold starting my car, the engine gives a fairly audible hissing sound when i cold start it. doesn't happen on warm starts.

fuel injectors spraying in more fuel to start perhaps?

unfortunately it doesn't happen all the time, so i don't have a video posted up, but if one day it happens when i record it, i'll postit up to make it more clear to you guys

cheers all

Happy lifting :P

Posted

No need to panic mate. What you are experiencing is the air being sucked past the small opening in the throttle body. When the engine is cold, it tends to require a little more air with the higher revs. Since your throttle stays in the same position, it needs to get this air somehow. The throttle body butterfly has a very small gap around the circumference of it in which air can be drawn through. Just like sucking air through a straw quickly, it makes noise.

If you put on a CAI or SRI, you will really hear it. 1ZZ's and 2ZZ's always surprised me with the vacuum sound they made which was usually more than other cars.

Posted

awesome i want this sound to be louder when i accelerate! B) jk

cheers guys :toast:


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