Quote Originally Posted by JohnL View Post
I'm not sure I follow what you mean about the "silicone gasket maker", you need to block off some substantial holes (IACV ports), and I'd have thought that even with a few minutes to cure (which would take a fair while longer with a big slug of silicone) the silicone goo would tend to get 'sucked' into either the plenum, the IACV, or both? If you sucked it into the IACV then you could bung it ip pretty comprehensively I suspect...

Do you mean you deliberately bunged up the IACV by filling it with goo?!

Just a thought. Have you checked the rubber gasket between the IACV and plenum? It could have a leak either to atmosphere around the edge, or from port to port (i.e. air could pass between one port and the other without being metered through the IACV).

Personally I won't let silicone gasket goo anywhere near my engine. I'm told that if it gets into the combustion chamber that it's burnt gasses can 'poison' the cat converter and impair it's function or even make it not work at all. From personal experience I know that it can get 'loose' inside the engine, not a good thing, though in a modern engine it would get caught by the oil filter before doing any damage... probably. It might possibly block the oil pump ports if there was enough of it...

When I used to work in a motor museum we had some come loose inside the engine of a Bugatti Type 35B, caused some issues as the oil filter was non existant (we didn't put the silicone in there, it was somebody who worked on the car before us).

My favourite gasket goos are; 'Aviation Gasket No3', or 'Blue Hylomar', both are 'non-hardening' and dissolve if they get into the oil but not if they stay in place at the gasket. Silicone is fine for gearboxes...

Nah nah u got me all wrong, i am using BLUE HYLOMAR, i checked the gaskets that i currently have and they seemed fine, so i just added some gasket goo just to seal the deal. not much just around the edges. I think the next thing i should do is remove the IACV and block the holes with something and test it like you said.

So sorry im coming to the conclusion that if the idol control seams fine and the idle screw is all the way in that something has to be leaking from inside the intake manifold but before the butterly and really theres only the IACV, throttle body (gasket), Butterfly (loose), or any of the vac lines attatched that could be causing the problems.... OR ECU (sensors)

And that when i plus in and out the IACV even now its making the idle rev to another 1000-2000rpm that is must be something there.

Sorry maybe im just thinking to myself but correct me if what im saying is wrong?