Should I be hearing air sucking into the IAC where it seats to the throttle body? It's a noticeable hiss, while I've been spraying everything with carb cleaner to find a possible vacuum leak.
IAC Air Flow?
- Thread starter surfobx031
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IF you are talking about where the body of the IAC solenoid bolts to the TB; then NO you should not ...
IF you are hearing a leak there... then there is a seal leaking by...
IF you are talking about where the disc of the IAC meets the seat inside the TB you could hear a noise in the TB port as the solenoid closes down IF your hearing were really good....
It's leaking where the solenoid bolts to the outside of the TB. I pulled it (again) cleaned it and the TB. The thin rubber grommet closest to the seat doesn't look bad, the part is only 5 or so years old.
The IAC you have installed looks like a KNOCK OFF and is not seated properly.
The picture I posted is a Mopar OEM IAC which seats flush to the TB body.
You're exactly right about not being Mopar, not sure what brand I bought a few years back. It has three nibs, you can see one in the pic, that prevent it from seating flush, which I always wondered about. I tried looking at the Mopar part on their website and the view I want is blurry, lol, so its been hard to compare. Thinking about possibly filing the three nibs down to make it flush, while Mopar part is on order.
Could you provide us with some vehicle information so members can better assist you with this problem.
2006 X, 4.0L, 6-speed manual transmission. Finally figured out how to put that in profile.
I shaved down the nibs on the POS IAC so that it fits flush with the TB. We'll see how that works. If problem persists then doing the smoke test.
This looks like the single-screw type of IAC that I have on my 4.0 (2005) engine. However that gap does look problematic.
There's 2 types of IACs; a two-screw with a sort of plunger on the intake end, and this type with a cup-like open end on its intake side.
When I replaced mine, I bought a new Mopar (Part Number 4861552AC) and it fit flush to the throttle body. The only 'sealing' part were the rubber rings around the cup end that plugged into the throttle body.
Most all of the line drawings on parts pages (and a good deal of the tutorials on removing and cleaning these) show just the 2-screw plunger IACs.
I ordered mine from https://www.moparfactoryparts.com/. Pricey, yes, but it fit perfectly with no problems.
Mopar Part Number: 4861552AC
It is a single screw type & I definitely ordered a replacement direct from Mopar. After doing a little research, it seems like just about every aftermarket, non-Mopar IAC's for my jeep has those 3 raised points on the seat, creating that gap between the solenoid & TB. Only took 5 minutes to file them down, but it's curious as to why they're manufactured like that.
Well, now you've got me curious about mine. I'll go double check and see if I have that gap too. I don't remember it being there, but let me confirm.
Edit: Mine looks like it has no gap. However, I can see one of those raised seating points. Odd yours did this to you. I hope you got it fixed.
Edit: Mine looks like it has no gap. However, I can see one of those raised seating points. Odd yours did this to you. I hope you got it fixed.
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Yeah I filed them down to seat it flush and no problems so far. Someone was telling me those raised points are supposed to fit into notches in the TB to align it correctly, which clearly do not exist on my TB, lol. Onward & upward...
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