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Need help on my boost leak

 
Old Apr 18, 2016, 10:57 AM
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Need help on my boost leak

I need help on my evo 8 i believe its a boost leak, i check my boost gauge its set at 15 psi but it goes all the way to 10 psi passed where it says (vac) on the gauge.
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Old Apr 18, 2016, 11:05 AM
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Errr, you mean when the car is running it's at -10psi?
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Old Apr 18, 2016, 11:05 AM
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in my experience boost gauges go bad pretty often. If you can, verify the gauge is accurate before taking too much apart. On that note though its never a bad idea to visually inspect all the hoses for anything super obvious.
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Old Apr 18, 2016, 12:08 PM
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Originally Posted by Epyon View Post
Errr, you mean when the car is running it's at -10psi?
Nope its 15. When im in a dead stop it goes to 10 and when i step on the gas boost collects and stops at 15.
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Old Apr 18, 2016, 12:09 PM
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Originally Posted by Biggiesacks View Post
in my experience boost gauges go bad pretty often. If you can, verify the gauge is accurate before taking too much apart. On that note though its never a bad idea to visually inspect all the hoses for anything super obvious.
Yes i checked all hoses there all good. Ill check the gauge
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Old Apr 18, 2016, 12:10 PM
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Originally Posted by Evoguy!123 View Post
Nope its 15. When im in a dead stop it goes to 10 and when i step on the gas boost collects and stops at 15.
10psi of boost at a stop? Sounds like a bad gauge to me.
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Old Apr 18, 2016, 12:14 PM
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Originally Posted by Biggiesacks View Post
10psi of boost at a stop? Sounds like a bad gauge to me.
Dont think so, there are times where it idles low
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Old Apr 18, 2016, 12:25 PM
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But you shouldn't even make boost at all during idle. It should be in heavy vacuum, My Evo X idles around -20 to -22 psi.
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Old Apr 18, 2016, 12:31 PM
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Are you going to listen to the people that are trying to help or just argue with them?
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Old Apr 18, 2016, 12:47 PM
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Originally Posted by razorlab View Post
Are you going to listen to the people that are trying to help or just argue with them?
Not arguing, the answers they gave me has been checked.
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Old Apr 18, 2016, 12:48 PM
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[QUOTE=Epyon;11604944]But you shouldn't even make boost at all during idle. It should be in heavy vacuum, My Evo X idles around -20 to -22 psi.[/

Yeah i aint running my car its parked.
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Old Apr 18, 2016, 12:50 PM
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Thank your guys for helping! This is why i love this form.
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Old Apr 18, 2016, 03:08 PM
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So borrow a compressor and do a boost leak test, should be done every year, when you get the pressure up you'll hear air escaping, I found a little broken vacuum pipe around the back on the injectors, never even knew it was there
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Old Apr 19, 2016, 08:31 AM
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check the EGR hoses under the intake I have had a few where one would pop off not a bad idea to zip tie all your vac hoses as well.
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Old Apr 20, 2016, 09:43 AM
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-20 to - 22 inches of vacuum not psi, you could divide it in half to get psi so -10 to -11 psi at idle
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