98 neon r/t dohc

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shumi2 - 09 Feb 2007 03:51 GMT

After driving for about 10 min there is a high piched sound that is comming
from the TB area.It goes away when you are on the gas. It sounds like a
vacuum leak but no codes come up for a vacuum leak any ideas what it might
be ??

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maxpower - 10 Feb 2007 15:57 GMT

> After driving for about 10 min there is a high piched sound that is comming
> from the TB area.It goes away when you are on the gas. It sounds like a
> vacuum leak but no codes come up for a vacuum leak any ideas what it might
> be ??

I will take a shot at this.....It could be a vacuum leak.

Glenn Beasley
Chrysler Tech

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shumi2 - 12 Feb 2007 00:25 GMT

Well why does it happen only after the car gets hot??one would think it
would happen all the time for a vacuum leak?on a side note... if you pinch
close the vacuum lines the pitch does not change it's sounds like a tea
kettle when its hot.

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maxpower - 12 Feb 2007 00:53 GMT

> Well why does it happen only after the car gets hot??one would think it
> would happen all the time for a vacuum leak?on a side note... if you pinch
> close the vacuum lines the pitch does not change it's sounds like a tea
> kettle when its hot.

Keep im mind I cannot hear the noise you are referring to, it could be a
normal noise from the AIS motor. If it were a vacuum leak.....it doesn't
mean it has to be a vacuum hose, It could be a gasket at the throttle body
or an intake manifold gasket. A can of throttle body cleaner sprayed in the
area of the noise may pinpoint a leak by spraying the area. Also a rubber
hose such as a 2 foot long heater hose works well to find such a noise,
place one end at the area the noise is heard and the other end placed at you
ear to locate it.

Glenn

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