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turbo problems

Old 10-31-2013, 12:32 PM
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Default turbo problems

1998 Audi A4
Has the ko3 turbo and manifold.
Checked MAF and replaced every vacuum hose clamp.



Only when flooring it, my car stutters seriously between 3-4000 rpms. Just had a new turbo manifold installed...could it be a mis adjusted wastegate or the tune gone bad?

Please help

Last edited by KingTomiii; 10-31-2013 at 12:34 PM.
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Old 10-31-2013, 02:41 PM
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Default Re: turbo problems

Mess around with the MAF and MAF connector. If that doesn't work, then see about buying one to test either used or new, maybe even borrow one.
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Old 10-31-2013, 02:56 PM
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I did that already and even cleaned the MAF. But I think my return line to my BOV is too flimsy ans isn't letting enough air pull through
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Old 10-31-2013, 03:12 PM
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Default Re: turbo problems

hmm, turbo is aftermarket or stock? may be boost cut, or boost leak?
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Old 10-31-2013, 04:54 PM
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Originally Posted by ohTONYoh:8226247
hmm, turbo is aftermarket or stock? may be boost cut, or boost leak?

It's stock, it just started happening after the manifold was installed
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Old 10-31-2013, 05:15 PM
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Default Re: turbo problems

Originally Posted by KingTomiii View Post
I did that already and even cleaned the MAF. But I think my return line to my BOV is too flimsy ans isn't letting enough air pull through
Why does the return line to the BOV matter at all? You're not actuating the BOV under the conditions that are causing the problems.

What is the boost doing under those conditions? Have you checked the TPS?

If you replaced one stock manifold with another stock manifold, it's probably something simple like a gasket leak. It's unlikely that an integral wastegate suddenly comes out of adjustment unless something got bent/damaged during the manifold swap.
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Old 10-31-2013, 05:27 PM
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Originally Posted by Fabrik8:8226278
Originally Posted by KingTomiii View Post
I did that already and even cleaned the MAF. But I think my return line to my BOV is too flimsy ans isn't letting enough air pull through
Why does the return line to the BOV matter at all? You're not actuating the BOV under the conditions that are causing the problems.

What is the boost doing under those conditions? Have you checked the TPS?

If you replaced one stock manifold with another stock manifold, it's probably something simple like a gasket leak. It's unlikely that an integral wastegate suddenly comes out of adjustment unless something got bent/damaged during the manifold swap.

No the wastegate is adjustable and I'm a novice to boosted cars, TPS meaning what? And the return line is attached to the manifold so I thought have been a vacuum leak
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Old 10-31-2013, 06:18 PM
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Default Re: turbo problems

Originally Posted by KingTomiii View Post
No the wastegate is adjustable and I'm a novice to boosted cars, TPS meaning what? And the return line is attached to the manifold so I thought have been a vacuum leak
Make sure your wastegate opens and closes freely, I know on my car if you put a new manifold on, it can block it from working correctly. And TPS is throttle position sensor.
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Old 10-31-2013, 06:57 PM
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Originally Posted by ohTONYoh:8226297
Originally Posted by KingTomiii View Post
No the wastegate is adjustable and I'm a novice to boosted cars, TPS meaning what? And the return line is attached to the manifold so I thought have been a vacuum leak
Make sure your wastegate opens and closes freely, I know on my car if you put a new manifold on, it can block it from working correctly. And TPS is throttle position sensor.


Ok I'll check in the AM when it's cold. And I'll have to find the TPS. But taking it to cars inc tomorrow for a second opinion. Thanks!
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