88porsche928

Hi my intake manifold is taken off along with the idle stabilizer, does any one have any picture on what goes where on the idle stabilizer? I read the Porsche 928 owners club guide on removing the intake manifold but I am still lost in the sauce. I could not find the installation instruction for installing the intake manifold or the idle stabilizer. I have to get this installed at latest sunday. I am buying tools in the morning. If I don't get my car's intake manifold installed and running I am totally ****ed. They are going to tow my car away it has to be moved.
thanks, dan

Rob Edwards

Hey Dan-

Here's a shot of the throttle body with the ISV and hoses in place:



An underside view of the intake with the flappy actuator, if you messed with the flappy, make sure it comes to rest against the hexagonal 'stop' bolt head:




The next few pics are of the complete intake ready to be re-mounted on the engine, with the vacuum hoses attached:

Front view:


Another front view:



Driver's side lateral (note position of TPS switch, rotated full clockwise so as to engage the idle contacts inside the switch):


Driver's rear 3/4 view:


Passenger front 3/4 view:


I'm stuck at home all weekend and will be by the computer. Yell if you need more images/input, I just did my intake, twice.....

88porsche928

rob that second pic where does that hose connect to? what does it connect to?

Rob Edwards

Dan-

That vacuum line from the flappy actuator goes forward, under the water bridge, and attaches to the flappy solenoid valve, which is mounted on one of the bolts that holds the driver's side timing belt cover. There are 2 vacuum attachments at the solenoid valve, one to the flappy, and the other runs along the top of the driver's side valve cover, adjacent to the fuel injector wiring harness.
I'll post a pic if I can find one.

Panzer9

here's the vacuum line diagram

Rob Edwards

Dan-

Here ya go, the vacuum line runs along with that Y-shaped breather hose under the coolant bridge. You have to stuff both of them under the coolant bridge while lowering the intake into place:

Bill Ball

Great shots, Rob.

88porsche928

An underside view of the intake with the flappy actuator, if you messed with the flappy, make sure it comes to rest against the hexagonal 'stop' bolt head:

i am going to take of my intake manifold again, I don't believe it has the hexagon bolt. Do you know what size it was?

Rob Edwards

I think the head on the 'stop' bolt is 19mm in diameter. Dunno how long or what the thread pitch is. This needs to be properly oriented or the intake flap will (eventually) dig into the circumference of the intake passage, gouging the intake, and potentially getting stuck closed. No flappy = less high-end power.....