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post #1 of 7 Old 09-13-2015, 10:48 PM Thread Starter
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2003 gt whoosh noise.. boost leak??

I would appreciate if any of you have some guidance or tips for me on this..
I recently bought a 2003 gt with 129k with a broken timing belt. I just did the timing belt and its timed perfectly, engine runs great. pulled the plugs and plug 4 was destroyed.. but it is running fine and no misfire codes or anything with it installed.. now the issue I'm having is when u hit the throttle you hear a whoosh or whistle. I'm guessing its a boost leak and should do a leak test but heres a few other things.. I found a hks blowoff valve and a turbosmart boost limiter inside the vehicle obviously removed. there is a spark plug in the one charge pipe (wtf?). I'm just wondering what the hell or where these things may of been installed as well?? I'm not the best with turbo systems!! heres a link to a video of it running

https://www.facebook.com/ben.malda/v...06373490870771
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post #2 of 7 Old 09-13-2015, 10:56 PM
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Re: 2003 gt whoosh noise.. boost leak??

Is there a vacuum line attched to the CBV (compressor by-pass valve, located on the compressor housing)? If it is hooked up, the CBV diaphragm is torn.
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post #3 of 7 Old 09-15-2015, 12:29 AM Thread Starter
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Re: 2003 gt whoosh noise.. boost leak??

I think It is hooked up.. I checked earlier today and looks to be, do you have a picture or diagram of it? I just went for a rip today with it and it seems like the turbo is doing nothing.. barely faster than my neon 2.0 if at all.. blew my turbo coolant feed line too.. ugh

here is a better video of the noise.

https://www.facebook.com/ben.malda/v...33048769661416
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post #4 of 7 Old 09-15-2015, 09:57 AM
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Re: 2003 gt whoosh noise.. boost leak??

Sounds like a BOV. Is the stock BOV still on the turbo?
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post #5 of 7 Old 09-16-2015, 10:59 PM Thread Starter
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Re: 2003 gt whoosh noise.. boost leak??

yes the stock blow off is installed. I removed the intake and inspected the 4 vacuum lines to the turbo. no leaks present. BUT... the vacuum lines are all all messed up. There is a vacuum line going from the wastegate to the surgevalve connected to nothing else. Why would someone do that?? everything else looks correct I think.. I connected the vacuum lines correctly and now it runs like crap so I just put it back to how it was..
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post #6 of 7 Old 04-24-2018, 04:49 AM
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Re: 2003 gt whoosh noise.. boost leak??

Vacuum it's main reason of many boost leak
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post #7 of 7 Old 06-22-2018, 06:09 PM
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Re: 2003 gt whoosh noise.. boost leak??

a kinda of kussssssssshhhhhhh, that you are hearing is your stock bov or recalculation valve opening up and shutting, as the springs in them are very light, i think around 4-6psi and they start to open,the stock ones are junk,too much unused air is trying to be recirculated and cant get through the exhaust fast enough so the only place for it to go is out the front of the turbo, that's why you hear it closer to your air box, YOU NEED A BOV TO LET THAT AIR OUT

as far as the parts you found, and the vac line situation, sounds like there might of been a aftermarket bov on there at some point and the line was used for it as the stock on on the stock valve isn't strong enough to open a aftermarket bov, i would get a block off plate $20ish and take the stock valve off there, and get a nice adapter tube and put that bov on the car, make sure not to use the vac line that on the stock valve, you will spool faster for sure, and with the right adjustment hold wot boost longer

as for the spark plug in the down pipe, my guess is someone was trying to impress their friends and shoot flames

PS.... take that air box off, cut it with a saw jaw right after the square part to leave a nice plastic tube to hook a cone filter to, Bam! $$8 CAI+Turbo Sounds

P.P.S.... Cut that muffler off the back, turbos like to breath, and if you feel frogy , hollow out your catalytic converter, just take the ceramic innards out , get some flew tube and clamps or get it welded back together
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