IAC repair Help
New User
Joined: Jan 2010
Posts: 10
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Sorry to bump this thread. I bought this valve from Advanced Auto and intend to use it on my turbo BMW (I know..crazy sounding). I use standalone engine management and this valve will work. I went and tapped the holes for 3/8 NPT to use AN fittings. My questions are:
Can I plug that brass inlet on the side? That is going to leak boost in my application.
I need to find the electrical connector for this valve. Does anyone know where I can get it locally or online for cheap? Thank you!
Can I plug that brass inlet on the side? That is going to leak boost in my application.
I need to find the electrical connector for this valve. Does anyone know where I can get it locally or online for cheap? Thank you!
Logistics Pro
Joined: Jun 2009
Posts: 4,823
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From: Cedar Rapids, IA
Is there going to be enough hole spacing to get a couple of AN fittings screwed in without interference?
What brass inlet are you referring to? Are you referring to a cap on the end used during machining? If so, yeah, no problem plugging it. With what, I'm not sure, but it isn't needed for operation.
For the connector why not just go to a salvage yard and cut one out of a donor vehicle?
-Rod
What brass inlet are you referring to? Are you referring to a cap on the end used during machining? If so, yeah, no problem plugging it. With what, I'm not sure, but it isn't needed for operation.
For the connector why not just go to a salvage yard and cut one out of a donor vehicle?
-Rod
New User
Joined: Jan 2010
Posts: 10
Likes: 0
Is there going to be enough hole spacing to get a couple of AN fittings screwed in without interference?
What brass inlet are you referring to? Are you referring to a cap on the end used during machining? If so, yeah, no problem plugging it. With what, I'm not sure, but it isn't needed for operation.
For the connector why not just go to a salvage yard and cut one out of a donor vehicle?
-Rod
What brass inlet are you referring to? Are you referring to a cap on the end used during machining? If so, yeah, no problem plugging it. With what, I'm not sure, but it isn't needed for operation.
For the connector why not just go to a salvage yard and cut one out of a donor vehicle?
-Rod
Here's a very crude (and laughable) drawing
Logistics Pro
Joined: Jun 2009
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From: Cedar Rapids, IA
I'm still now clear what "brass vent" you are referring to. Any chance you could link to a photo so we're all on the same page? Is it the piece that's parallel to the connector?
My concern on the spacing for the AN fittings is for interference between the hex portions of the fittings. Will there be space to screw two fittings into the IAC without the hex heads interfering with each other?
-Rod
My concern on the spacing for the AN fittings is for interference between the hex portions of the fittings. Will there be space to screw two fittings into the IAC without the hex heads interfering with each other?
-Rod
New User
Joined: Jan 2010
Posts: 10
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I'm still now clear what "brass vent" you are referring to. Any chance you could link to a photo so we're all on the same page? Is it the piece that's parallel to the connector?
My concern on the spacing for the AN fittings is for interference between the hex portions of the fittings. Will there be space to screw two fittings into the IAC without the hex heads interfering with each other?
-Rod
My concern on the spacing for the AN fittings is for interference between the hex portions of the fittings. Will there be space to screw two fittings into the IAC without the hex heads interfering with each other?
-Rod
There will be room for the hex portions because I turn them in a lathe if they're too large.
Logistics Pro
Joined: Jun 2009
Posts: 4,823
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From: Cedar Rapids, IA
Interesting, I've never pulled those caps to see what was under them. I'm not sure what that is for, I suppose it's a pressure release vent in case there is a backfire through the ignition? I'm not sure what pressure it would release at, but at idle I wouldn't expect your turbos to be creating enough pressure to open the vent. Under throttle I wouldn't expect the pressure at the vent to be very high since the throttle plate would be bypassing IAC for the most part. Not all IAC valves have such a vent though, so it probably would also be fine to plug this one.
-Rod
-Rod
Logistics Pro
Joined: Jun 2009
Posts: 4,823
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From: Cedar Rapids, IA
When the cap is installed this port is probably blocked, therefore under normal application there wouldn't be unmetered air. Then the cap might blow off if there were a backfire, but if the engine is running fine would never cause an issue.
Since not all IACs have the vent I suspect you could safely plug this one off or purchase one from a different application.
-Rod
Since not all IACs have the vent I suspect you could safely plug this one off or purchase one from a different application.
-Rod
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New User
Joined: Jan 2010
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When the cap is installed this port is probably blocked, therefore under normal application there wouldn't be unmetered air. Then the cap might blow off if there were a backfire, but if the engine is running fine would never cause an issue.
Since not all IACs have the vent I suspect you could safely plug this one off or purchase one from a different application.
-Rod
Since not all IACs have the vent I suspect you could safely plug this one off or purchase one from a different application.
-Rod
I am going to assume though that I can block that port of.
Do you know of another part number w/o a port so I can compare?
New User
Joined: Jan 2010
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Thanks Rod - I just looked that part up on Advanced Auto and it has the odd port shape. That'd work but I'd need to machine an adapter plate - not a big deal, but trying to avoid it. I am going to plug this guy - I think it should work fine. Thanks for all your help!
New User
Joined: Feb 2011
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IAC test help
I tested my IAC and the ohms between the pins is 10.0... but when I check for the internal case short.... I get no reading not even OL.... I put my neg lead to the case and the pos lead to the pin but no readings not even OL.... does anyone know why I wouldn't get a reading
Logistics Pro
Joined: Jun 2009
Posts: 4,823
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From: Cedar Rapids, IA
Are you sure you're set to resistance? If so, an open circuit would give "OL" typically and a short circuit would give 0.00 (assuming you have compensated for scope probe losses). Anything in between would also be shown. Is OL displayed when the probes are not connected to anything?
If you are on the diode setting you might get a different display, possibly such as you note. Or maybe the batteries in your meter are low.
-Rod
If you are on the diode setting you might get a different display, possibly such as you note. Or maybe the batteries in your meter are low.
-Rod