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> 940 Iac - Is It Supposed To Be Wide Open, Or Shut, With No Power?, Idle Air Control technical info requested
SmittySmithsonit...
post Aug 13 2019, 09:22 AM
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Location: Central MA, USA
Drives: '93 940 sedan



New member here. Trying to diagnose a bad IAC with no service info - frustrating as hell!

VEHICLE: '95 940 wagon, 2.3L 4-cylinder Bosch system, 2-pin IAC.

All my testing has narrowed it down to the IAC. What I want to know is, as the unit is sitting in my hand, should I be seeing right inside the unit through the port that's pointing down in the last pic? From what I've been reading, this should be closed off with no power applied. Also, this unit has 2 pins - not 3 - for the electrical connection. When I energize the unit, the shutter flips around briefly, and can barely be seen through the port. I can blow air through it regardless of having 12v at the pins, or 0v at the pins.

Thing looks fairly new, and is extremely clean inside as you can see. I sprayed some silicone spray in there to lube and clean things up a bit (not that it needed it - just in case it may have been sticking). Anyone ever looked inside one of these, or better yet, anyone have a known good one laying around to look at? I suspect I should be seeing the shutter closing off that port when there's no voltage applied to the pins. I just need 100% confirmation of this.

Any and all info will be greatly appreciated!

Attached File  GOPR0766.JPG ( 4.03MB ) Number of downloads: 5


Attached File  GOPR0767.JPG ( 3.41MB ) Number of downloads: 4


Attached File  GOPR0770.JPG ( 3.81MB ) Number of downloads: 2
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SmittySmithsonit...
post Aug 23 2019, 02:48 PM
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Location: Central MA, USA
Drives: '93 940 sedan



Whelp, solved my own problem here. Hopefully this helps someone else out.

I hate winging parts at something without thorough troubleshooting, and being 200% sure that a new part will fix the problem. Without service info, I took a chance based on my limited testing and observation of the old part, and purchased a brand new Bosch idle air control valve. Lo and behold, the shutter is 90% CLOSED! There's just a tiny opening to the left - 90% of the opening is blocked by the shutter. Exactly what I suspected. Made the right call, and for that I'm happy.

Here's pictures of the new unit taken in the exact location of the old unit in the post above (down the tube with the arrow on it).

This post has been edited by SmittySmithsonite: Aug 23 2019, 03:04 PM
Attached File(s)
Attached File  GOPR0800.JPG ( 4.42MB ) Number of downloads: 1
Attached File  GOPR0801.JPG ( 4.62MB ) Number of downloads: 3
Attached File  GOPR0802.JPG ( 5.4MB ) Number of downloads: 2
 
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grendel1960
post Aug 24 2019, 12:41 AM
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thanks
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