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Next: 2001 A6 Avant inner door panel
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External
Since: Aug 05, 2004
Posts: 20
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(Msg. 1) Posted: Sat May 27, 2006 6:15 pm
Post subject: Dump valve on 2001 A4 1,8 TS
Archived from groups: alt>autos>audi (more info?)
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Hi again,
Question this time on what might be causing a rapid clacking sound under
accelerations around 1500-2000 rpm, especially when engine is hot. I am
beginning to suspect the dump (bypass) valve, since I've now heard that
the valve can open and close rapidly, creating this kind of noise, if
malfunctioning.
Anyone having any experience of this.
For those who know something about dump valves, what kinds of symptoms
can a faulty valve cause?
Thanks, Robert |
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External
Since: Aug 18, 2004
Posts: 87
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(Msg. 2) Posted: Sat May 27, 2006 10:54 pm
Post subject: Re: Dump valve on 2001 A4 1,8 TS [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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More likely you have a bad waste gate actuator. When that goes bad you hear a
rattle and your boost is very low. You can just barely see the wast gate
actuator rod under the tubing. Put a small wodden stick in there (engine shut
off) and try to move it. If it moves at all that is your problem.
The actuator and rod can be found for about $200 but the work to pull the turbo
is enough to make it worth considering a new K03.
or ..
Better yet you might find this a good time to upgrade toa Ko4 and chip from APR.
Robert wrote:
> Hi again,
>
> Question this time on what might be causing a rapid clacking sound under
> accelerations around 1500-2000 rpm, especially when engine is hot. I am
> beginning to suspect the dump (bypass) valve, since I've now heard that
> the valve can open and close rapidly, creating this kind of noise, if
> malfunctioning.
>
> Anyone having any experience of this.
>
> For those who know something about dump valves, what kinds of symptoms
> can a faulty valve cause?
>
> Thanks, Robert
> |
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External
Since: Aug 05, 2004
Posts: 20
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(Msg. 3) Posted: Mon May 29, 2006 5:06 am
Post subject: Re: Dump valve on 2001 A4 1,8 TS [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Tony wrote:
> More likely you have a bad waste gate actuator. When that goes bad you
> hear a rattle and your boost is very low. You can just barely see the
> wast gate actuator rod under the tubing. Put a small wodden stick in
> there (engine shut off) and try to move it. If it moves at all that is
> your problem.
>
> The actuator and rod can be found for about $200 but the work to pull
> the turbo is enough to make it worth considering a new K03.
>
> or ..
>
> Better yet you might find this a good time to upgrade toa Ko4 and chip
> from APR.
>
> Robert wrote:
>
>> Hi again,
>>
>> Question this time on what might be causing a rapid clacking sound
>> under accelerations around 1500-2000 rpm, especially when engine is
>> hot. I am beginning to suspect the dump (bypass) valve, since I've now
>> heard that the valve can open and close rapidly, creating this kind of
>> noise, if malfunctioning.
>>
>> Anyone having any experience of this.
>>
>> For those who know something about dump valves, what kinds of symptoms
>> can a faulty valve cause?
>>
>> Thanks, Robert
>>
Tony, I haven't had the opportunity to try to move the actuator rod but
I do know that I always get good boost, which is why I'm doubting that
the wastegate (or the electromagnetic valve that sets up the vacuum that
moves it) is the trouble.
Do you or anyone out there know if a faulty dump valve can cause this?
/Robert >> Stay informed about: Dump valve on 2001 A4 1,8 TS |
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External
Since: Dec 08, 2005
Posts: 1
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(Msg. 4) Posted: Thu Jun 01, 2006 9:48 pm
Post subject: Re: Dump valve on 2001 A4 1,8 TS [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Robert" wrote:
> Do you or anyone out there know if a faulty dump valve can cause this?
This isn't a symptom I noticed, but my 1.8T (2003 OEM valve) started to
"chatter" when I let go of the throttle. (Accelerate *hard* and then really
*let go* of the right pedal). It's not hard to pull out the DV and have a
look: there's a simple test for one of the more popular non-OEM replacements
described here:
http://www.forgemotorsport.com/valve_service.pdf >> Stay informed about: Dump valve on 2001 A4 1,8 TS |
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