Just did vaccuum line job, mostly happy but a problem
I had an idle problem a couple weeks back and decided to take the opportunity to replace my vaccuum lines while I was working on my idle issues. Well now I am getting a perfect idle and that I am pretty sure is a result of replacing all the intake gaskets. My problem is that I am no longer able to boost above about 3 psi. When I do boost that little bit, and let off I get this noise that has a distinct disco sound to it. You know that one sound, sort of a boooo that goes from high pitch to low pitch. Other than that it runs great! Perfectly smooth at idle and everywhere else in the RPM range. I am thinking that is probably the sound of a vaccuum line that is either detached or was torn during install and has a big hole in it. I am sort of hoping it is a leak in the intercooler pipes or elbow to throttle body junction because that would be easy to find, but I doubt it will be that easy. Any ideas? Is this an intake leak or a vaccuum line problem? Maybe a check valve is in reversed, what happens if any of them are in wrong?
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I get that weird sound to when I start to boost but not full boost. It sounds like its coming from the stock Y-pipe/primary turbo area. I'm soon buying Efini Y-pipe and Greddy Dual Intake Kit and hopefully the sound will go away!
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check for boost leaks.
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Yeah 3 psi is more than likely a boost leak. Are you getting any whooshing sound? Check the accordian hose that runs from the crossover tube to the bottom of the intercooler. They are notorious for blowing.
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what gaskets did you change? TB?LIM?UIM?
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Originally posted by RX7Wishing what gaskets did you change? TB?LIM?UIM? Good call on the accordian hose to the intercooler. I had one go a couple months ago and have a spare of the other, If that is it should be pretty simple to find tonight. thanks |
Take a spray bottle filled with water and spray the vacumm hoses and fittings listen for a change in the engine noise, when you hear it at least you know about where the leak is....Good Luck
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FWIW: When I did a vaccum job on a customers car that had good boost before then had your symptoms almost exactly. What it turned out to be in my case was that i had reversed the vaccum lines going to the pressure tank,.. and the one going to the UIM with the Green/black check valve.)....Basically, I put the hose that was supposed to have the check valve in it(from the rat's nest to the UIM, not the y-pipe one), onto the pressure tank. Then put the check valve in the hose that was supposed to go to the tank, and connected it to the UIM
Have I lost you yet? ... Anyways, the results were the lack of boost and when i let of the throttle it would honk high to low pitch. I looked at an old picture of the hoses at the time of disassembly to figure out which hoses i switched. If I confused you, you can PM me your e-mail and I can send you pics of the hoses I am talking about. Hopefully That may help you out. Very similar symptoms. |
I think Tom is referring to the Simmons drum machine sound
Does it sound like this? http://www.anodized.com/~clayne/tomfd.wav :hah: |
That's the friggin sound dead on Clayne!! haha!!:rlaugh:
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ROFL yea but slightly higher pitched lolz!
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Originally posted by SWAT81 ROFL yea but slightly higher pitched lolz! http://bud.homeunix.net:8080/audio/tomfd2.wav Well I checked the intercooler accordian pipes and that isnt it. I did find a check valve that was backwards but that is about it. Tomorrow I will compare vaccuum line diagrams and make sure I dont have something switched. It is so annoying to have it so close yet still not working quite right. BigIslandSevens, I understand what you are saying. I will look at that tomorrow and make sure I didnt swap one of the vaccuum tank lines with a line that is supposed to go to the manifold. I know there was a little confusion when I was connecting the tank and that side of the manifold. I could see getting that screwed up. thanks |
Well I got the boost issue resolved. It was another reversed check valve, the one going to something related to the secondary pre-control. Now I think I introduced a new leak somewhere on the intake manifold because I am back to the initial problem before the gasket and vaccuum hose job. When I roll up to a stop, let off the gas and puch in the clutch the rpms drop and sometimes dont stop dropping, stalling out. Oh well, will have to look into it more this weekend.
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