93 UrS4 hesitation problem

[Tim Sexton]

Sounds to me exactly like a bad bypass valve.  It may or may not throw a code,
depending on how bad it fails. BTDT on my S4. If you take the valve off, and
apply vacuum to it, you will be ablt to tell if it's bad.
HTH,
Tim Sexton

94 S4
87 5kcstq
86 4kcsq


At 1:28 AM -0400 4/30/02, Audisport8 at aol.com <mailto:Audisport8 at aol.com> wrote:

>Has anyone experienced really bad cutting in and out under
>hard acceleration?  I can't tell if it is detonation or a spark plug problem.
>I replaced the plugs once already because they were fouled so badly.
>This only happens under hard acceleration.  Please help!

snip....