Where is the turbo bypass valve?

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Scott I. Remick - 20 Jul 2004 00:31 GMT

I am trying to replace the turbo bypass (dump) valve (aka "hooter" valve)
on my 1990 SAAB 900 SPG but I can't for the life of me find the damn
thing. I found some info and a pic at:

http://www.saabsite.com/Bypassvalvediagnosis.htm

But that doesn't look anything like what I see. They show all this plastic
duct work under the distributor over on the right side. All I see is the
exhaust manifold off the engine and the turbine itself (both of which
should be in the bottom of that pic but aren't).

Can anyone help me out here? I must be blind...

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Charles Stoyer - 20 Jul 2004 00:55 GMT

There is a valve, plastic I think, about 1.5" in diam and maybe 2" long.
Hose comes from near the throttle plate to the boot which connects to the
turbo intake. There is also a small vacuum hose connected to the thing. It
is just behind the turbo intake and probably there is a heater hose on top
of it.

I am looking at an 85 and 86 900 T.

Charles.

> I am trying to replace the turbo bypass (dump) valve (aka "hooter" valve)
> on my 1990 SAAB 900 SPG but I can't for the life of me find the damn
[quoted text clipped - 8 lines]
>
> Can anyone help me out here? I must be blind...

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Paul Halliday - 20 Jul 2004 18:27 GMT

Find the throttle butterfly on your intake manifold. Opposite the butterfly
is a half inch width pipe that gradually gets wider and ends up at the
"hooter" valve.

It recirculates turbo-charged air back into the pre-turbo air pipe when the
throttle is closed. If you don't have one, get one fitted - they're about 20
UKP new from SAAB or some other Bosch dealer.

Paul

1989 900 Turbo S
http://saab.go.dyndns.org/

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