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Author Strange Throttle Body Noise
chris_uk
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Registered: 8th Jul 03
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19th Jun 08 at 11:08   View Garage View User's Profile U2U Member Reply With Quote
i heard it yesterday from low revs, sort of a swoosh noise, never heard it before and i know it hasnt been here in the past because you can really hear it.

ive located the noise back to the throttle body..

here is a video of what its doing.

http://www.youtube.com/watch?v=GIPmeIInWQ8
Matt L
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19th Jun 08 at 11:11   View User's Profile U2U Member Reply With Quote
sounds like the part that moves is catchin the side of it (got the radio on and computer sound is shite )
chris_uk
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19th Jun 08 at 11:12   View Garage View User's Profile U2U Member Reply With Quote
no its not scratchin as ive had it off and moved it about freely and its clear all the way round.
Planty02
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19th Jun 08 at 11:14   View User's Profile U2U Member Reply With Quote
sounds a little bit like the noise my 1.2 C makes when I stick my foot down (i.e. straight down)

..doesnt do it if i gradually open the throttle though
chris_uk
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19th Jun 08 at 11:20   View Garage View User's Profile U2U Member Reply With Quote
yea mine is the same, if you do it gradually it doesnt do it, just when you plant your foot.
Planty02
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19th Jun 08 at 11:22   View User's Profile U2U Member Reply With Quote
Mines always done it since I got the car, I just assume its due to air being sucked into the throttle body tbh
chris_uk
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19th Jun 08 at 11:24   View Garage View User's Profile U2U Member Reply With Quote
thats what it sounds like, but its just wierd how it just started happening.

changed nothing.
Planty02
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19th Jun 08 at 11:25   View User's Profile U2U Member Reply With Quote
started planting your foot more?
chris_uk
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19th Jun 08 at 11:36   View Garage View User's Profile U2U Member Reply With Quote
no lol

i was showing my mate the pull in 5th and it didnt do it.. then next time it did and its done it ever since.

power / performance dont seem to have changed.
Planty02
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19th Jun 08 at 11:38   View User's Profile U2U Member Reply With Quote
when you plant your foot nad it mkes the noise, is there a split second hesitation before the power comes?
jr
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19th Jun 08 at 11:40   View User's Profile U2U Member Reply With Quote
didnt you do something weird to the tb chris like self port it ?
chris_uk
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19th Jun 08 at 11:45   View Garage View User's Profile U2U Member Reply With Quote
yea but that was AGES ago..

you can see how shiney it all is in the pic..

but i never went anywhere near the butterfly valve. and it all looks the same as before. (inside)
chris_uk
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19th Jun 08 at 11:46   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Planty02
when you plant your foot nad it mkes the noise, is there a split second hesitation before the power comes?


nope instant.
RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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19th Jun 08 at 12:57   View User's Profile U2U Member Reply With Quote
Is it just the one throttle making the noise?
chris_uk
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19th Jun 08 at 13:29   View Garage View User's Profile U2U Member Reply With Quote
what you mean one throttle?
Mike GSi
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Registered: 3rd Jan 07
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19th Jun 08 at 13:51   View User's Profile U2U Member Reply With Quote
alot of TB's make that noise, my Clio 16v Used to make that noise but you couldnt here it with the airbox on.

as did my mates MG ZR
RCS
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19th Jun 08 at 15:05   View User's Profile U2U Member Reply With Quote
Sorry thought you had individual throttle bodies
chris_uk
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19th Jun 08 at 15:08   View Garage View User's Profile U2U Member Reply With Quote
naa just the one.

http://www.corsasport.co.uk/board/viewthread.php?tid=437454

[Edited on 19-06-2008 by chris_uk]
RCS
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19th Jun 08 at 15:14   View User's Profile U2U Member Reply With Quote
But yeah that is a common noise. The initial swoosh is caused by the sudden change in pressure difference as the throttle plate angle changes quickly.

This is why you see acceleration fuelling settings in ECU's, to accomodate for this phenomena.
chris_uk
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19th Jun 08 at 15:16   View Garage View User's Profile U2U Member Reply With Quote
what i dont get is that it never did it 2 days ago and it just started yesterday..

there is no reason for it..

 
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