1990 200 TQA..ISV WOT WGFV.. When and why

[Konstantin Bogach]

$4 at European Precision(see parts suppliers list).

Stacy Anable wrote:

> i had a similar problem with my isv, and after checking everything and even
> trying a diff isv i found that the problem we a defective temp sender. when
> it is idleing funny try unplugging the one pin temp sender on top of the
> thermostat housing, then plug it back in, if you idle goes down unplugged
> but goes back up plugged in, that may be your prob, it wouldn't hurt to
> replace this little sender its only 15 bucks at schucks
>
> stacy
>
> >From: "Nicholas  Lawrence" <nick at beol.net>
> >To: "Audi (E-mail)" <quattro at audifans.com>
> >Subject: 1990 200 TQA..ISV    WOT  WGFV.. When and why
> >Date: Sat, 12 May 2001 17:08:01 -0500
> >
> >     I suspect my ISV is sticking, I've tried cleaning numerous times to no
> >avail. Idle is erratic high and will go down if I unplug ISV.
> >     Question:  when does the ISV work and why not leave it unplugged? runs
> >OK in that mode.
> >     The WOT is open at full throttle (no continuity) and as I understand
> >it
> >has to function in order for boost to be controlled by ECU. With analog
> >gauge I get only 4psi and bypassing the WGFV brings 12 plus and fuel cut
> >off
> >so it is capable of boost.
> >     Question:  Is there a reason for not "making" the switch full time and
> >letting the ECU handle boost?
> >     And are these parts dealer only?
> >     TIA
> >     Nick   90' 200 TQA
> >
> >
> >
> >
> >
> >
> >
>
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