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Boost Leak at Throttle Body??

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Old Feb 4, 2008, 10:20 AM
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Boost Leak at Throttle Body??

I performed a boost leak check yesterday and after fixing a few leaks I found a leak through the stock BPV. First question, to plumb this up I connected the pressure to the outlet side of this valve and still got leakage, is this the correct way to do this?
Second question, I'm more concerned that I hear leakage past the throttle body where the throttle wire connects to it. It gets worse if I put a little side rpessure on it with my finger, but sometimes gets better if I turn the throttle, like I was stepping on the gas? Any thoughts??
Old Feb 4, 2008, 10:23 AM
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https://www.evolutionm.net/forums/sh...tle+body+seals
Old Feb 4, 2008, 05:07 PM
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The throttle body seals dry rot and go bad in the 8s, I had the same problem.
Old Feb 4, 2008, 06:06 PM
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WORKS sells the seals....
Old Feb 4, 2008, 06:08 PM
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machv also.
Old Feb 4, 2008, 10:47 PM
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get the works seals.....no comparison...

hell, i have fixed more evo 9 seals than evo 8's. e9's crack quicker for some reason...not sure why.
Old Feb 4, 2008, 11:12 PM
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I've seen Evo 9's with less than 6k on them with bad throttle seals.

I suspect some of them are damaged from the factory.

Then there are Evo's like mine, 45,000 miles, seen 30psi+ and eleventy billion heat cycles and boost lap after lap at the track and my factory seals are still good.
Old Feb 9, 2008, 12:49 PM
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its a common problem...you dont have to change them..its not a big deal..most shops say leave it..
Old Feb 9, 2008, 01:06 PM
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if its leaking fix it. why would you want to have a boost leak^^^
Old Feb 9, 2008, 10:03 PM
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Originally Posted by jezefink
its a common problem...you dont have to change them..its not a big deal..most shops say leave it..
I didn't notice that mine were leaking and I ended up blowing the seals on my turbo, so I would get it fixed!!
Old Feb 9, 2008, 10:09 PM
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boost leaks rob power. Get the works seals and call it a day.
Old Feb 9, 2008, 11:47 PM
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i made over 500hp on meth with a throttle bodie that sisses on meth...there isnt a real problem..do a boost leak test..see how quick the pressure goes down by looking at ur boost gauge..if it holds pretty well and goes down real slow there isnt a big reason to fix right away..........obviously mitsu has a reason for doing this..if its that common on cars that are that new..
Old Feb 9, 2008, 11:54 PM
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Listen to what WOT and Razorlab have to say. They are 2 of the people I trust the most when it comes to Evos
Old Feb 17, 2008, 02:01 AM
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Are replacing the seals very difficult?
Old Feb 17, 2008, 02:05 AM
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no look in the how to's and it will show you step by step and if you have any questions you can pm me and I will talk you through it.


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