Well,

I had the inlet manifold off yesterday/today to fit my breather system mods. Was also doing a bit of r/r whilst in there and replaced some of the hoses, connectors etc.

Unfortunately seems I have not been able to track down what I perceive to be a slight vacuum leak in that my tickover speed is a little elevated - it is running at about 800 rpm. the a/c compessor pulls it down a tad so this tells me there is a leak.

Anyway, vac leak not withstanding, whilst replacing the check valve and the vac connectors I had to undo one of the connectors to the passive vacuum system and in trying to pull out the nylon line I must have counter reacted too hard and broke the nozzle on the fitting that goes into the servo. What a pissy pathetic connection that is - I am amazed it lasted so long [as in longer than 5 minutes!

I sealed up the by now good for nothing broken connection with some silicon RTV. The problem then was where to connect the vacuum to. I decided that the 7 way connector would suffice to supply the vacuum and it seems to have worked ok- the passive vac system now holds the vac without any losses over a 30 minute period. Can anyone think of any reason why this location could be problemmatical? The only thing I could think of is that the servo might pull a slightly fuller vacuum as it is derived from the inlet runner area?

Any thoughts?

Regards

Fred

 

I don´t see a problem since both source from within the throttle body. There might just be a difference in vacuum due to difference in connection diameter.

 

Tickover is idle rpm? That should be controlled by the brain with the IAC valve independent of any less than stellar leaks.

You have several different types of vacuum; brake booster and AC actuators get a strong continuous vacuum independent of manifold vacuum, manifold vacuum, and two throttle position sensitive vacuum circuits that swap between atmospheric pressure and manifold pressure and vice versa when the throttle is opened a bit above idle. Everything needs to go to the correct vacuum circuit.

 

posting a picture of what you have and how you fixed it,
would be a better way to get a perfect answer to your question

 

Stan,
have tapped into the 7 way vac manifold just behind the MAF. All these connections in that location see live vacuum. I have introduced a line from this piece of kit via a new check valve that then connects to the vac reservoir and the other connections in that circuit -the HVAC system, the auto box shift damper and the flappy.

Apologies but m more or less out on my feet at the moment

Regards

Fred