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Took apart Intake Manifold yesterday

 
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Old 07-06-2008, 05:00 AM
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Took apart Intake Manifold yesterday

And dismantled the whole thing, IAC, TB front, the butterflies etc. I cleaned everything and took great care putting everything back correctly.

I noticed the throttle body butterfly in the front of intake start wasn't seating with the screw on the side of it. Where the spring loaded area is (where you connect the Accel. cable). There was a 2mm gap and this makes me think that the tb butterfly isn't seating correctly or 100% closed on idle.

Are they usually this way? or is the tb butterfly seated 100% closed, no air passing.

I ask this because after refitting the entire assembly the car pulls wonderfully but when I get to robots on a hill, the automatic gearbox doesn't hold the hill and the car rolls backwards. The idle is low, like 500rpms which made me think that extra air is getting in somehow.

I adjusted idle up on the idle screw but that hasn't helped much. The car still rolls back a bit and the accel. feels strange, like a slight nudge is needed to push it down to get moving. Almost like the cable is sticking a little. I've checked that first though and it looks fine to me.

Any ideas?
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Old 07-06-2008, 07:33 AM
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Here are some pictures of what I did with a mate of mine, they are in order. Only difference I noticed was the dimples on the butterflies were facing the 1st stage runners and when we were done, they were facing outwards. It shouldn't make a difference because they are still facing the correct what (two notches facing correct way).






























maybe this is dirt in IAC still. We may think its clean, but maybe we shifted some dirt around and that is causing issues. Looked clean though, nothing more came out.
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Old 07-06-2008, 08:35 AM
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Hey man, long time no see. How's the little Mazda going?

Anyway, mine idles at about 500 (as indicated on the factory tacho) when warm so I'm not sure I would be worried about that.

The way I understand teh inlet manifold, the TB can't seal off 100% air tight at no throttle because if it did there would be a sever case of oxygen starvation causing the engine to stall. If there's anybody who can shed more light on that I'm all ears, becuase to be brutally honest I'm not 100% sure. But I can't see the im getting air in from anywhere else.
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Old 07-06-2008, 09:17 AM
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Hey bud!

Mazda is in our shop for a 270 degree, custom grind cam install, vernier dial in and some tuning. Hoping to make 95kw at the wheels, we are 6000ft above sea level here :) so power is hard to come by.

Yeah I was thinking the TB can't seal 100%. I've managed to get the car to hold a hill now, steep hills aren't possible like I was able to. The only issue atm is that sometime the pedal gets "stuck" before pulling away, I have to nudge it pretty hard to get it to take and accel forward. I've checked the accel cable and the intake butterfly, no restriction. I am sure I will find the issue shortly.

I am idling about 550rpm to keep hills, so its a little higher than stock.

Oh yes, brash, looking for a set of these if you hear of neone getting rid of em: http://i112.photobucket.com/albums/n...cture006-1.jpg

Cheers.

Last edited by nitrogen; 07-18-2010 at 12:44 PM.
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Old 07-06-2008, 10:04 PM
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nitrogen, is that just a bucket of soapy water and what all is in it?
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Old 07-07-2008, 02:20 AM
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Dish washing soap FTW! :P

That was just the rinsing bucket, we were using turps to clean the items.
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