83sweet928

Thanks for the reply, if you lean over the passenger side and reach in just left and down from the back of the TB down a bit you will feel them. I Will try to get a picture tomorrow.

Landseer

Is it shown in either of these two pictures???

Landseer

Gio,

For diagrams (or equivalent descriptions in this case + troubleshooting ), try the Moorehouse CD set, CD1 section 2.15, "service info by year".

Try the 1987 year, starting on page 34. That should get you going. 88 and 89 will give info also, but the way these documents work is that the first year of a particular change gets the heavy documentation.

Also try Dwaynes intake write-up for the 87.



I'm using the hell out of this set of documents for the 85 model year for other reasons.

83sweet928

YES...the second picture is it.

Landseer

Ahh, the 'themostatic valve in liquid cooling system', in the diagram. One side to control valve I, One side to vac source.

The shape of the control valve I and II in the diagram are exaggerations of the shape of the valves on the car, kind of anatomically correct in terms of shape and location of the various vac ports on them, so you should be able to trace stuff now???

The vac sources 1 and 2 on the TB are confusing though from the picture.

I'm running the distrbutor timing advance ( and one side of the thermostatic valve) from the port on the back of the TB that is closer to the passenger side. Am running fuel regulators off the one on the drivers side back of TB. Seems to be working ok.

83sweet928

Does this give vacuum or take vacuum?

83sweet928

In the diagram it is showin the location at the front of then motor, isnt this near the rear just behind the TB?

Landseer

I think its the only way it can go. That part looks out-of-place in the diagram from a space perspective, probably due to crowding of the diagram.

What else could it be?

Its working for me.

Same with the ports 1 and 2 on the TB. Shown in wrong orientation I think.

Maybe send Wally Plumley a PM with a link to this thread and your other one for some real pro-help.

danglerb

1 on the that diagram is I think called "ported" vacuum, atm at idle, and goes to manifold vacuum as soon as the throttle plate opens a bit, and goes to thermo valve and dist.

2 is always manifold vacuum and goes to fuel regulators, etc.

Landseer

Thanks, Mike!

mikegnx

I bought a 1982 Porsche 928, the vacuum hoses were not in the right place, on my throttle body I have 2 small vacuum inlets in the front and 2 in the back, most images I found have 1 in the front and 2 in the back. Does anybody have an image that shows where the 4 vacuum inlets go to?

Daniel5691

this?

Mrmerlin

On that picture where would the vacuum advance port come from ?
It shows the port for vacuum retard next to the idle adjustment screw.

I have a 78 5 speed with a single port advance unit.,
and am getting conflicting diagrams,
the port on the front of the TB has vacuum at idle .