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P0401 code with weird noise

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Old Jun 6, 2009, 08:24 PM
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P0401 code with weird noise

Yes i know there are threads here with the P0401 code Insufficient EGR Flowand i have read most of them but it still hasnt solved my problem. I checked all the lines and they seem to be on the right locations, none of them popped off.

Whenever i go into boost though I hear a nasty leak sound and its pretty damn loud. It sounds kinda like a squeel as if the vacuum line has a small leak and air is escaping but im not exactly sure whats going on. Boost is still somewhat the same but drivability has changed a slight bit. The car normally is pretty responsive, but now its less responsive.

Any Input/Questions regarding is greatly appreciated.

Anyone local not on SCE willing to come check it out is more than welcome as well

located in Whittier, CA

-yoshi
Old Jun 7, 2009, 02:10 AM
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There is a hose under the intake manifold throttle bosy area that pops off and casues the p0401. Check this

An Yes I'm on SCE
Old Jun 7, 2009, 09:59 AM
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^^^i checked all the hoses *im sure i did*

and none of them seem to be popped off.....
Old Jun 7, 2009, 06:33 PM
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bump to resolve this ****
Old Jun 7, 2009, 09:54 PM
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Like oldevodude said check the hoses under and behind the throttle body. It's really small and thin like a piece of spagetti. I'll bet you that is your 401. It's happened to me twice. Since then I have zipped tied it and no more 401.
Old Jun 7, 2009, 09:58 PM
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do a boost leak test
Old Jun 7, 2009, 10:03 PM
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Take it to RRE....they'll figure it out
Old Jun 8, 2009, 01:03 AM
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Originally Posted by 3K
Like oldevodude said check the hoses under and behind the throttle body. It's really small and thin like a piece of spagetti. I'll bet you that is your 401. It's happened to me twice. Since then I have zipped tied it and no more 401.
please read what i wrote.

i said i checked ALL the hoses yet my problem still hasnt been resolved.

thank you for your input though

Originally Posted by idriveanevo
do a boost leak test
could be a possibility

Originally Posted by HaVoK23
Take it to RRE....they'll figure it out
i'd rather not...

thank you though.
Old Jun 8, 2009, 01:04 AM
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tomorrow im going to take off the EGR valve and then im going to clean it to see if thats the problem, im also going to double check all the lines again. freakin weird i tell ya..
Old Jun 8, 2009, 04:07 PM
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problem solved
Old Jun 8, 2009, 04:24 PM
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Originally Posted by S2myEvo
problem solved
How did you fix the problem?
Old Jun 8, 2009, 09:04 PM
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Same code here, waiting for the fix.....
Old Jun 8, 2009, 11:04 PM
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I know help us out!!
Old Jun 9, 2009, 03:12 AM
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since it was so simple ill tell you guys. LOL

basically what happened, was the one of my intercooler pipes was ripped. it was ripped right where it meets the throttle body. all i did was cut the IC hose, refitted and voila! back to normal!

so check your IC hoses!!! make sure theres no tears in it!
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