KingTomiii

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

ohTONYoh

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.

KingTomiii

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

ohTONYoh

hmm, turbo is aftermarket or stock? may be boost cut, or boost leak?

KingTomiii

It's stock, it just started happening after the manifold was installed

Fabrik8

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.

KingTomiii

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

ohTONYoh

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.

KingTomiii

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!