Welcome Guest ( Log In | Register )

Hello, we have answers for your Volvo-related questions!. Why not take a few moments to ask a question, help provide a solution or just engage in a conversation with another member in any one of our forums. Together we can make our Volvo community a better place.
Reply to this topicStart new topic
Do you like Volvo-Forums.com? Link to us and help spread the word about our forum. Thanks!
> 940 Iac - Is It Supposed To Be Wide Open, Or Shut, With No Power?, Idle Air Control technical info requested
post Aug 13 2019, 09:22 AM
Post #1


Group: Members
Posts: 2
Joined: 13-August 19
Member No.: 247,731
Status: Offline
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
Go to the top of the page
post Aug 23 2019, 02:48 PM
Post #2


Group: Members
Posts: 2
Joined: 13-August 19
Member No.: 247,731
Status: Offline
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
Go to the top of the page
post Aug 24 2019, 12:41 AM
Post #3

Group Icon

Group: Super Mod
Posts: 1,830
Joined: 25-June 06
Member No.: 16,314
Status: Offline
Location: Canterbury UK
Drives: 2002 Volvo V70 D5 S

Go to the top of the page
« Next Oldest Volvo 940 & 960 Forum Next Newest »
  Advanced Search

1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

Reply to this topicStart new topic
Get your Volvo listed in the Garage Today, for FREE, to share with the world what you drive and what toys and modifications you have.


> Similar Topics

  Topic Replies Topic Starter Views Last Action
No New Posts 940 Estate Rear Headrest Removal
How to remove rear headrest ?
3 rvergnet 1,615 15th November 2020 - 08:55 PM
Last post by: danielm85948
No New Posts Is This Hose Supposed To Be There?
3 tamworth Mike 1,482 7th November 2020 - 03:05 PM
Last post by: tamworth Mike
No New Posts Is This A Serious Forum?
2 Ima Poster 1,550 4th November 2020 - 12:45 AM
Last post by: grendel1960
No New Posts Is It Possible To Add Key With Xtool Pad2 Ver Volvo Xc60 2009
0 eobd2 795 7th September 2020 - 04:43 AM
Last post by: eobd2
No New Posts Noisy Ac Compressor That Works
9 outofworkjoe 6,266 2nd September 2020 - 04:10 PM
Last post by: ishmot

> Link To Us
If you found our site useful please link to us <a href="https://www.volvo-forums.com">Volvo-Forums.com</a>.
Time is now: 25th January 2021 - 09:59 AM
© 2004 Volvo-forums.com
Volvo-Forums.com is not affiliated with or endorsed by Volvo Car Corporation.