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Old 12-30-2014, 09:58 PM   #1
idobson
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Cosi knock off install - IAC

I notice on this manifold that where the IAC goes the top hold vents to the TB and out to the atmosphere and the bottom hole goes nowhere.

Anyone that's installed one of these, how did you deal with this issue?

Also the IAC won't fit flush on the base but I can fix that with a file :)


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Old 12-31-2014, 04:36 AM   #2
yellowhatch
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Drill out the hole that goes to nowhere (so that it matches the hole that is already drilled) and tap/plug the outer plug on the side (bottom picture) with a NPT plumbing fitting. Let me know if you need any more help. Also if you have the later p/s reservoir that interferes you do not have to notch the manifold. I know how to get around that issue as well.
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Old 12-31-2014, 11:42 AM   #3
idobson
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Thanks, that seemed like the logical solution but I figured someone would have done it already and I couldn't find anything about it on the forum.
Thanks again..
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Old 01-14-2015, 11:34 PM   #4
Phestezio
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Yeah you would need to drill the one hohole that goes nowhere into the manifold and plug the outer hole so it won't leak to atmosphere. It's very hard to find any kind of info on the install of this manifold. I've been planning on doing a write up on if for months I just haven't had the time to sit down and do it well I've been so busy I don't get on as much as I want. I helped yellowhatch with the mods to his manifold and I have plenty of pictures throughout the process if you have any questions.

Also don't even bother with the cover gasket that comes with it, it is complete junk. The best thing you could do would be to get some gasket making material and use the crap gasket to trace and make a new one, and go ahead and make 2 or 3. Then when you put the cover on put a thin layer of silicone on the cover and a thin layer on the seam on the manifold and sandwich your newly made gasket in between the silicone. The knock-off manifolds have a bad tendency of leaking around the cover. Try to use a oil/fuel resistant silicone.

Also go ahead and test fit your throttle body to the manifold and open the throttle plate so you can see how close of a port match it is, I haven't seen one yet that has the throttle body lined up perfectly. As long as it's not so far off that it interferes with the throttle plate then you could just leave it, but I prefer to try and match it as close as I can. And in the case of an aftermarket throttle body the hole is just plain too small and I recommend porting the manifold to match as close as you can.

Again if you have any questions feel free to ask
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