Leon Speed

when on the 7-way splitter two vacuum ports are plugged?

Inquiring minds want to know

GregBBRD

Because the people that make the splitters had an entire box of "over-run" 7 way pieces and they sold them to Porsche cheaper than the 5 way?

Actually, I think that you probably have a 5 speed. On an automatic, one of the two extra ports goes to the modulator, leaving only one port?

Leon Speed

Can't figure it out. Maybe the 7-way is a relic of an older MY design?

I have an automatic, but with a 5-way splitter. One to the intake, two to the FPR, one to the FPD, one to the trans modulator.

On a 5-speed, are only four ports in use?

Rob Edwards

Yes- 1 port from the lower plenum, 3 out to the fuel dampers and FPR, and 1 blocked.



WSM diagram, with the 5th port going to auto transmission:

Leon Speed

Right, thanks for confirming. That picture is the promised land I will never reach but I can at least clean the engine up.

How are ports plugged from the factory? I've seen the put-in-a-screw method, but it is a bit too much shade tree mechanic for me.

Rob Edwards

IIRC there are little black plastic mushroom-shaped plugs. I have an extra old 5-way somewhere in the garage, will try to take a pic tonight.

GregBBRD

They make a small metal plug to fit into the rubber tee. They are available.

Rob Edwards

Ah! 'Stopper', 900 312 012 02.

Leon Speed

Hey - good info! I want to have those. Cool little original thingies.

Rob Edwards

Pelican says NLA but 928Intl lists them. Maybe they'll have 'em- certainly used, at least.

GlennD

The seven way splitter is from the older cars. My 86.5 has a seven way.

Maybe one just found its way into your engine bay

Cheers
Glenn