88 5kq Mystery vacuum hose

[Bernard Littau]

> The hose(tube) has very small inside diameter and runs from a T connector
> under the ISV valve that connects to a hose going to the fuel injector air
> shroud. The third leg of the T goes to the air boot . .I think. The other
> end of this tube goes to the back of the air filter box.
>
> I took the air filter out . . but cannot see any openings for this tube .
.
> .maybe it connects thru internal filter container passages to the
> differential pressure regulator?
> I think the tube is providing a vacuum signal resulting from the shroud
air
> system. Something to do with for Limp Home mode?
>
> The Bentley does not show the tube.
>
> There is a pix of the hose in the family album:
> A10Q, 1990, MG 1, S 33, Illustration 15-60        item 17
>
> Any body know what the function for this tube is?

Hi Syl,

Not sure what the hose goes to, but from your description it sounds a lot
like the vacuum line for the decell valve on the manual transmission 5ktq.
On the 5ktq it goes to a blow-off type valve near the air box, best accessed
with the PS front wheel and plastic fender shroud removed.

Here is the area on Scott's web site that talks about it:
http://www.sjmautotechnik.com/ecusys.html#decel

Hope this helps!

Bernard Littau
Woodinville, WA
'88 5ktq